极限尺寸

极限尺寸

2级标准系列统一螺纹的极限尺寸(0~15/16)

2级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

2A外螺纹

2B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

0-80

UNF

0.059 5

0.056 3

0.051 4

0.049 6

0.044 6

0.046 5

0.051 4

0.051 9

0.054 2

0.060 0

1-64

UNC

0.072 4

0.068 6

0.062 3

0.060 3

0.053 8

0.056 1

0.062 2

0.062 9

0.065 5

0.073 0

1-72

UNF

0.072 4

0.068 9

0.063 4

0.061 5

0.055 9

0.058 0

0.063 4

0.064 0

0.066 5

0.073 0

2-56

UNC

0.085 4

0.081 3

0.073 8

0.071 7

0.064 1

0.066 7

0.073 7

0.074 4

0.077 2

0.086 0

2-64

UNF

0.085 4

0.081 6

0.075 3

0.073 3

0.066 8

0.069 1

0.075 2

0.075 9

0.078 6

0.086 0

3-48

UNC

0.098 3

0.093 8

0.084 8

0.082 5

0.073 5

0.076 4

0.084 5

0.085 5

0.088 5

0.099 0

3-56

UNF

0.098 3

0.094 2

0.086 7

0.084 5

0.077 0

0.079 7

0.086 5

0.087 4

0.090 2

0.099 0

4-40

UNC

0.111 2

0.106 1

0.095 0

0.092 3

0.081 4

0.084 9

0.093 9

0.095 8

0.099 1

0.112 0

4-48

UNF

0.111 3

0.106 8

0.097 8

0.095 4

0.086 5

0.089 4

0.096 8

0.098 5

0.101 6

0.112 0

5-40

UNC

0.124 2

0.119 1

0.108 0

0.105 4

0.094 4

0.097 9

0.106 2

0.108 8

0.112 1

0.125 0

5-44

UNF

0.124 3

0.119 5

0.109 5

0.107 0

0.097 2

0.100 4

0.107 9

0.110 2

0.113 4

0.125 0

6-32

UNC

0.137 2

0.131 2

0.116 9

0.114 1

0.100 0

0.104

0.114

0.117 7

0.121 4

0.138 0

6-40

UNF

0.137 2

0.132 1

0.121 0

0.118 4

0.107 4

0.011 1

0.119

0.121 8

0.125 2

0.138 0

8-32

UNC

0.163 1

0.157 1

0.142 8

0.139 9

0.125 9

0.130

0.139

0.143 7

0.147 5

0.164 0

8-36

UNF

0.163 2

0.157 7

0.145 2

0.142 4

0.130 1

0.134

0.142

0.146 0

0.149 6

0.164 0

10-24

UNC

0.189 0

0.181 8

0.161 9

0.158 6

0.139 4

0.145

0.155

0.162 9

0.167 2

0.190 0

10-32

UNF

0.189 1

0.183 1

0.168 8

0.165 8

0.151 9

0.156

0.164

0.169 7

0.173 6

0.190 0

12-24

UNC

0.215 0

0.207 8

0.187 9

0.184 5

0.165 4

0.171

0.181

0.188 9

0.193 3

0.216 0

12-28

UNF

0.215 0

0.208 5

0.191 8

0.188 6

0.172 5

0.177

0.186

0.192 8

0.197 0

0.216 0

12-32

UNEF

0.215 0

0.209 0

0.194 7

0.191 5

0.177 8

0.182

0.190

0.195 7

0.199 8

0.216 0

1/4-20

UNC

0.248 9

0.240 8

0.216 4

0.212 7

0.189 4

0.196

0.207

0.217 5

0.222 4

0.250 0

1/4-28

UNF

0.249 0

0.242 5

0.225 8

0.222 5

0.206 5

0.211

0.220

0.226 8

0.231 1

0.250 0

1/4-32

UNEF

0.249 0

0.243 0

0.228 7

0.222 5

0.211 8

0.216

0.224

0.229 7

0.233 9

0.250 0

5/16-18

UNC

0.311 3

0.302 6

0.275 2

0.271 2

0.245 1

0.252

0.265

0.276 4

0.281 7

0.312 5

5/16-20

UN

0.311 3

0.303 2

0.278 8

0.274 7

0.251 8

0.258

0.270

0.280 0

0.285 3

0.312 5

5/16-24

UNF

0.311 4

0.304 2

0.284 3

0.280 6

0.261 8

0.267

0.277

0.285 4

0.290 2

0.312 5

5/16-28

UN

0.311 5

0.305 0

0.288 3

0.284 8

0.269 0

0.274

0.282

0.289 3

0.293 8

0.312 5

5/16-32

UNEF

0.311 5

0.305 5

0.291 2

0.287 9

0.274 3

0.279

0.286

0.292 2

0.296 5

0.312 5

3/8-16

UNC

0.373 7

0.364 3

0.333 1

0.328 7

0.299 3

0.307

0.321

0.334 4

0.340 1

0.375 0

3/8-20

UN

0.373 8

0.365 7

0.341 3

0.337 2

0.314 3

0.321

0.332

0.342 5

0.347 9

0.375 0

3/8-24

UNF

0.373 9

0.366 7

0.346 8

0.343 0

0.324 3

0.330

0.340

0.347 9

0.352 8

0.375 0

3/8-28

UN

0.373 9

0.367 4

0.350 7

0.347 1

0.331 4

0.336

0.345

0.351 8

0.356 4

0.375 0

3/8-32

UNEF

0.374 0

0.368 0

0.353 7

0.350 3

0.336 8

0.341

0.349

0.354 7

0.359 1

0.375 0

7/16-14

UNC

0.436 1

0.425 8

0.389 7

0.385 0

0.351 0

0.360

0.376

0.391 1

0.397 2

0.437 5

7/16-16

UN

0.436 1

0.426 7

0.395 5

0.390 9

0.361 7

0.370

0.384

0.396 9

0.402 9

0.437 5

7/16-20

UNF

0.436 2

0.428 1

0.403 7

0.399 5

0.376 7

0.383

0.395

0.405 0

0.410 4

0.437 5

7/16-28

UNEF

0.436 4

0.429 9

0.413 2

0.409 6

0.393 9

0.399

0.407

0.414 3

0.419 0

0.437 5

7/16-32

UN

0.436 5

0.430 5

0.416 2

0.412 8

0.399 3

0.404

0.411

0.417 2

0.421 6

0.437 5

1/2-13

UNC

0.498 5

0.487 6

0.448 5

0.443 5

0.406 9

0.417

0.434

0.450 0

0.456 5

0.500 0

1/2-16

UN

0.498 6

0.489 2

0.458 0

0.453 3

0.424 2

0.432

0.446

0.459 4

0.465 5

0.500 0

1/2-20

UNF

0.498 7

0.490 6

0.466 2

0.461 9

0.439 2

0.446

0.457

0.467 5

0.473 1

0.500 0

1/2-28

UNEF

0.498 9

0.492 4

0.475 7

0.472 0

0.456 4

0.461

0.470

0.476 8

0.481 6

0.500 0

1/2-32

UN

0.490 0

0.493 0

0.478 7

0.475 2

0.461 8

0.466

0.474

0.479 7

0.484 2

0.500 0

9/16-12

UNC

0.560 9

0.549 5

0.506 8

0.501 6

0.461 7

0.472

0.490

0.508 4

0.515 2

0.562 5

9/16-16

UN

0.561 1

0.551 7

0.520 5

0.515 8

0.486 7

0.495

0.509

0.521 9

0.528 0

0.562 5

9/16-18

UNF

0.561 1

0.552 4

0.525 0

0.520 5

0.494 9

0.502

0.515

0.526 4

0.532 3

0.562 5

9/16-20

UN

0.561 2

0.553 1

0.528 7

0.524 4

0.501 7

0.508

0.520

0.530 0

0.535 6

0.562 5

9/16-24

UNEF

0.561 3

0.554 1

0.534 2

0.530 2

0.511 7

0.517

0.527

0.535 4

0.540 5

0.562 5

9/16-28

UN

0.561 4

0.554 9

0.538 2

0.534 5

0.518 9

0.524

0.532

0.539 3

0.544 1

0.562 5

9/16-32

UN

0.561 4

0.555 4

0.541 1

0.537 6

0.524 2

0.529

0.536

0.542 2

0.546 8

0.562 5

5/8-11

UNC

0.623 3

0.611 2

0.564 3

0.558 8

0.515 0

0.527

0.546

0.566 0

0.573 2

0.625 0

5/8-12

UN

0.623 4

0.612 0

0.569 3

0.563 9

0.524 2

0.535

0.553

0.570 9

0.578 0

0.625 0

5/8-16

UN

0.623 6

0.614 2

0.583 0

0.578 2

0.549 2

0.557

0.571

0.584 4

0.590 6

0.625 0

5/8-18

UNF

0.623 6

0.614 9

0.587 5

0.582 8

0.557 4

0.565

0.578

0.588 9

0.594 9

0.625 0

5/8-20

UN

0.623 7

0.615 6

0.591 2

0.586 9

0.564 2

0.571

0.582

0.592 5

0.598 1

0.625 0

5/8-24

UNEF

0.623 8

0.615 6

0.596 7

0.592 7

0.574 2

0.580

0.590

0.597 9

0.603 1

0.625 0

5/8-28

UN

0.623 9

0.617 4

0.600 7

0.596 9

0.581 4

0.586

0.595

0.601 8

0.606 7

0.625 0

5/8-32

UN

0.623 9

0.617 9

0.603 6

0.600 0

0.586 7

0.591

0.599

0.604 7

0.609 3

0.625 0

11/16-12

UN

0.685 9

0.674 5

0.631 8

0.626 3

0.586 7

0.597

0.615

0.633 4

0.640 5

0.687 5

11/16-16

UN

0.686 1

0.676 7

0.645 5

0.640 7

0.611 7

0.620

0.634

0.646 9

0.653 2

0.687 5

11/16-20

UN

0.686 2

0.678 1

0.653 7

0.649 3

0.626 7

0.633

0.645

0.655 0

0.660 7

0.687 5

11/16-24

UNEF

0.686 3

0.679 1

0.659 2

0.655 2

0.636 7

0.642

0.652

0.660 4

0.665 7

0.687 5

11/16-28

UN

0.686 4

0.679 9

0.663 2

0.659 4

0.643 9

0.649

0.657

0.664 3

0.669 2

0.687 5

11/16-32

UN

0.686 4

0.680 4

0.666 1

0.662 5

0.649 2

0.654

0.661

0.667 2

0.671 9

0.687 5

3/4-10

UNC

0.748 2

0.735 3

0.683 2

0.677 3

0.629 1

0.642

0.663

0.685 0

0.692 7

0.750 0

3/4-12

UN

0.748 3

0.736 9

0.694 2

0.688 7

0.649 1

0.660

0.678

0.695 9

0.703 1

0.750 0

3/4-16

UNF

0.748 5

0.739 1

0.707 9

0.702 9

0.674 1

0.682

0.696

0.709 4

0.715 9

0.750 0

3/4-20

UNEF

0.748 7

0.740 6

0.716 2

0.711 8

0.689 2

0.696

0.707

0.717 5

0.723 2

0.750 0

3/4-28

UN

0.748 8

0.742 3

0.725 6

0.721 8

0.706 3

0.711

0.720

0.726 8

0.731 8

0.750 0

3/4-32

UN

0.748 9

0.742 9

0.728 6

0.725 0

0.711 7

0.716

0.724

0.729 7

0.734 4

0.750 0

13/16-12

UN

0.810 8

0.799 4

0.756 7

0.751 1

0.711 6

0.722

0.740

0.758 4

0.765 6

0.812 5

13/16-16

UN

0.811 0

0.801 6

0.770 4

0.765 5

0.736 6

0.745

0.759

0.771 9

0.778 3

0.812 5

13/16-20

UNEF

0.811 2

0.803 1

0.778 7

0.774 3

0.751 7

0.758

0.770

0.780 0

0.785 8

0.812 5

13/16-28

UN

0.811 3

0.804 8

0.788 1

0.784 2

0.768 8

0.774

0.782

0.789 3

0.794 3

0.812 5

13/16-32

UN

0.811 4

0.805 4

0.791 1

0.787 4

0.774 2

0.779

0.786

0.792 2

0.797 0

0.812 5

7/8-9

UNC

0.873 1

0.859 2

0.800 9

0.794 6

0.740 8

0.755

0.778

0.802 8

0.811 0

0.875 0

7/8-12

UN

0.873 3

0.861 9

0.819 2

0.813 6

0.774 1

0.785

0.803

0.820 9

0.828 2

0.875 0

7/8-14

UNF

0.873 4

0.863 1

0.827 0

0.821 6

0.788 3

0.798

0.813

0.828 6

0.835 6

0.875 0

7/8-16

UN

0.873 5

0.864 1

0.832 9

0.828 0

0.799 1

0.807

0.821

0.834 4

0.840 8

0.875 0

7/8-20

UNEF

0.873 7

0.865 6

0.841 2

0.836 7

0.814 2

0.821

0.832

0.842 5

0.848 3

0.875 0

7/8-28

UN

0.873 8

0.867 3

0.850 6

0.846 7

0.831 3

0.836

0.845

0.851 8

0.856 9

0.875 0

7/8-32

UN

0.873 9

0.867 9

0.853 6

0.849 9

0.836 7

0.841

0.849

0.854 7

0.859 5

0.875 0

15/16-12

UN

0.935 8

0.924 4

0.881 7

0.876 1

0.836 6

0.847

0.865

0.883 4

0.890 7

0.937 5

15/16-16

UN

0.936 0

0.926 6

0.895 4

0.890 4

0.861 6

0.870

0.884

0.896 9

0.903 3

0.937 5

2级标准系列统一螺纹的极限尺寸(15/16~1 3/4)

2级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

2A外螺纹

2B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

15/16-20

UNEF

0.936 1

0.928 0

0.903 6

0.899 1

0.876 6

0.883

0.895

0.905 0

0.910 9

0.937 5

15/16-28

UN

0.936 3

0.929 8

0.913 1

0.909 2

0.893 8

0.899

0.907

0.914 3

0.919 4

0.937 5

15/16-32

UN

0.936 4

0.930 4

0.916 1

0.912 3

0.899 2

0.904

0.911

0.917 2

0.922 1

0.937 5

1-8

UNC

0.998 0

0.983 0

0.916 8

0.910 1

0.849 2

0.865

0.890

0.918 8

0.927 6

1.000 0

1-12

UNF

0.998 2

0.986 8

0.944 1

0.938 2

0.899 0

0.910

0.928

0.945 9

0.953 5

1.000 0

1-16

UN

0.998 5

0.989 1

0.957 9

0.952 9

0.924 1

0.932

0.946

0.959 4

0.965 9

1.000 0

1-20

UNEF

0.998 6

0.990 5

0.966 1

0.961 6

0.939 1

0.946

0.957

0.967 5

0.973 4

1.000 0

1-28

UN

0.998 8

0.992 3

0.975 6

0.971 6

0.956 3

0.961

0.970

0.976 8

0.982 0

1.000 0

1-32

UN

0.998 9

0.992 9

03978 6

0.974 8

0.961 7

0.966

0.974

0.979 7

0.984 6

1.000 0

11/16-8

UN

1.060 5

1.045 5

0.979 3

0.972 5

0.911 7

0.927

0.952

0.981 3

0.990 2

1.062 5

11/16-12

UN

1.060 8

1.049 4

1.006 7

1.001 0

0.961 6

0972

0.990

1.008 4

1.015 8

1.062 5

11/16-16

UN

1.061 0

1.051 6

1.020 4

1.015 4

0.986 6

0.995

1.009

1.021 9

1.028 4

1.062 5

11/16-18

UNEF

1.061 1

1.052 4

1.025 0

1.020 2

0.994 9

1.002

1.015

1.026 4

1.032 6

1.062 5

11/16-20

UN

1.061 1

1.053 0

1.028 6

1.024 0

1.001 6

1.008

1.020

1.030 0

1.035 9

1.062 5

11/16-28

UN

1.061 3

1.054 8

1.038 1

1.034 1

1.018 8

1.024

1.032

1.039 3

1.044 5

1.062 5

11/8-7

UNC

1.122 8

1.106 4

1.030 0

1.022 8

0.952 7

0.970

0.998

1.032 2

1.041 6

1.125 0

11/8-8

UN

1.122 9

1.107 9

1.041 7

1.034 8

0.974 1

0.990

1.015

1.043 8

1.052 8

1.125 0

11/8-12

UNF

1.123 2

1.111 8

1.069 1

1.063 1

1.024 0

1.035

1.053

1.070 9

1.078 7

1.125 0

11/8-16

UN

1.123 5

1.114 1

1.082 9

1.077 9

1.049 1

1.057

1.071

1.084 4

1.091 0

1.125 0

11/8-18

UNEF

1.123 6

1.114 9

1.087 5

1.082 7

1.057 4

1.065

1.078

1.088 9

1.095 1

1.125 0

11/8-20

UN

1.123 6

1.115 5

1.091 1

1.086 5

1.064 1

1.071

1.082

1.092 5

1.098 5

1.125 0

11/8-28

UN

1.123 8

1.117 3

1.100 6

1.096 6

1.081 3

1.086

1.095

1.101 8

1.107 0

1.125 0

13/16-8

UN

1.185 4

1.170 4

1.104 2

1.097 2

1.036 6

1.052

1.077

1.106 3

1.115 4

1.187 5

13/16-12

UN

1.185 8

1.174 4

1.131 7

1.126 0

1.086 6

1.097

1.115

1.133 4

1.140 9

1.187 5

13/16-16

UN

1.186 0

1.176 6

1.145 4

1.140 3

1.111 6

1.120

1.134

1.146 9

1.153 5

1.187 5

13/16-18

UNEF

1.186 1

1.177 4

1.150 0

1.145 2

1.119 9

1.127

1.140

1.151 4

1.157 7

1.187 5

13/16-20

UN

1.186 1

1.178 0

1.153 6

1.149 0

1.126 6

1.133

1.145

1.155 0

1.161 0

1.187 5

13/16-28

UN

1.186 3

1.179 8

1.163 1

1.159 0

1.143 8

1.149

1.157

1.164 3

1.169 6

1.187 5

11/4-7

UNC

1.247 8

1.231 4

1.155 0

1.147 6

1.077 7

1.095

1.123

1.157 2

1.166 8

1.250 0

11/4-8

UN

1.247 9

1.232 9

1.166 7

1.159 7

1.099 1

1.115

1.140

1.168 8

1.178 0

1.250 0

11/4-12

UNF

1.248 2

1.236 8

1.194 1

1.187 9

1.149 0

1.160

1.178

1.195 9

1.203 9

1.250 0

11/4-16

UN

1.248 5

1.239 1

1.207 9

1.202 8

1.174 1

1.182

1.196

1.209 4

1.216 0

1.250 0

11/4-18

UNEF

1.248 5

1.239 8

1.212 4

1.207 5

1.182 3

1.190

1.203

1.213 9

1.220 2

1.250 0

11/4-20

UN

1.248 6

1.240 5

1.216 1

1.211 4

1.189 1

1.196

1.207

1.217 5

1.223 6

1.250 0

11/4-28

UN

1.248 8

1.242 3

1.225 6

1.221 5

1.206 3

1.211

1.220

1.226 8

1.232 1

1.250 0

15/16-8

UN

1.310 4

1.295 4

1.229 2

1.222 1

1.161 6

1.177

1.202

1.231 3

1.240 5

1.312 5

15/16-12

UN

1.310 8

1.299 4

1.256 7

1.250 9

1.211 6

1.222

1.240

1.258 4

1.265 9

1.312 5

15/16-16

UN

1.311 0

1.301 6

1.270 4

1.265 3

1.236 6

1.245

1.259

1.271 9

1.278 6

1.312 5

15/16-18

UNEF

1.311 0

1.302 3

1.274 9

1.270 0

1.244 8

1.252

1.265

1.276 4

1.282 8

1.312 5

15/16-20

UN

1.311 1

1.303 0

1.278 6

1.273 9

1.251 6

1.258

1.270

1.280 0

1.286 1

1.312 5

15/16-28

UN

1.311 3

1.304 8

1.288 1

1.284 0

1.268 8

1.274

1.282

1.289 3

1.294 7

1.312 5

13/8-6

UNC

1.372 6

1.354 4

1.264 3

1.256 3

1.174 1

1.195

1.225

1.266 7

1.277 1

1.375 0

13/8-8

UN

1.372 8

1.357 8

1.291 6

1.284 4

1.224 0

1.240

1.265

1.293 8

1.303 1

1.375 0

13/8-12

UNF

1.373 1

1.361 7

1.319 0

1.312 7

1.273 9

1.285

1.303

1.320 9

1.329 1

1.375 0

13/8-16

UN

1.373 5

1.364 1

1.332 9

1.327 7

1.299 1

1.307

1.321

1.334 4

1.341 1

1.375 0

13/8-18

UNEF

1.373 5

1.364 8

1.337 4

1.332 5

1.307 3

1.315

1.328

1.338 9

1.345 3

1.375 0

13/8-20

UN

1.373 6

1.365 5

1.341 1

1.336 4

1.314 1

1.321

1.332

1.342 5

1.348 6

1.375 0

13/8-28

UN

1.373 8

1.367 3

1.350 6

1.346 5

1.331 3

1.336

1.345

1.351 8

1.357 2

1.375 0

17/16-6

UN

1.435 1

1.416 9

1.326 8

1.318 8

1.236 6

1.257

1.288

1.329 2

1.339 6

1.437 5

17/16-8

UN

1.435 3

1.420 3

1.354 1

1.346 9

1.286 5

1.302

1.327

1.356 3

1.365 7

1.437 5

17/16-12

UN

1.435 7

1.424 3

1.381 6

1.375 7

1.336 5

1.347

1.365

1.383 4

1.391 0

1.437 5

17/16-16

UN

1.435 9

1.426 5

1.395 3

1.390 1

1.361 5

1.370

1.384

1.396 9

1.403 6

1.437 5

17/16-18

UNEF

1.436 0

1.427 3

1.399 9

1.395 0

1.369 8

1.377

1.390

1.401 4

1.407 8

1.437 5

17/16-20

UN

1.436 1

1.428 0

1.403 6

1.398 9

1.376 6

1.383

1.395

1.405 0

1.411 2

1.437 5

17/16-28

UN

1.436 2

1.429 7

1.413 0

1.408 8

1.393 7

1.399

1.407

1.414 3

1.419 7

1.437 5

11/2-6

UNC

1.497 6

1.479 4

1.389 3

1.381 2

1.299 1

1.320

1.350

1.391 7

1.402 2

1.500 0

11/2-8

UN

1.497 8

1.482 8

1.416 6

1.409 3

1.349 0

1.365

1.390

1.418 8

1.428 3

1.500 0

11/2-12

UNF

1.498 1

1.486 7

1.444 0

1.437 6

1.398 9

1.410

1.428

1.445 9

1.454 2

1.500 0

11/2-16

UN

1.498 4

1.489 0

1.457 8

1.452 6

1.424 0

1.432

1.446

1.459 4

1.466 2

1.500 0

11/2-18

UNEF

1.498 5

1.489 8

1.462 4

1.457 4

1.432 3

1.440

1.453

1.463 9

1.470 4

1.500 0

11/2-20

UN

1.498 6

1.490 5

1.466 1

1.461 3

1.439 1

1.446

1.457

1.467 5

1.473 7

1.500 0

11/2-28

UN

1.498 7

1.492 2

1.475 5

1.471 3

1.456 2

1.461

1.470

1.476 8

1.482 3

1.500 0

19/16-6

UN

1.560 1

1.541 9

1.451 8

1.443 6

1.361 6

1.382

1.413

1.454 2

1.464 8

1.562 5

19/16-8

UN

1.560 3

1.545 3

1.479 1

1.471 7

1.411 5

1.427

1.452

1.481 3

1.490 9

1.562 5

19/16-12

UN

1.560 7

1.549 3

1.506 6

1.500 7

1.461 5

1.472

1.490

1.508 4

1.516 1

1.562 5

19/16-16

UN

1.560 9

1.551 5

1.520 3

1.515 1

1.486 5

1.495

1.509

1.521 9

1.528 7

1.562 5

19/16-18

UNEF

1.561 0

1.552 3

1.524 9

1.519 9

1.494 8

1.502

1.515

1.526 4

1.532 9

1.562 5

19/16-20

UN

1.561 1

1.553 0

1.528 6

1.523 8

1.501 6

1.508

1.520

1.530 0

1.536 2

1.562 5

15/8-6

UN

1.622 5

1.604 3

1.514 2

1.506 0

1.424 0

1.445

1.475

1.516 7

1.527 4

1.625 0

15/8-8

UN

1.622 8

1.607 8

1.541 6

1.534 2

1.474 0

1.490

1.515

1.543 8

1.553 5

1.625 0

15/8-12

UN

1.623 2

1.611 8

1.569 1

4.563 2

1.524 0

1.535

1.553

1.570 9

1.578 6

1.625 0

15/8-16

UN

1.623 4

1.614 0

1.582 8

4.577 5

1.549 0

1.557

1.571

1.584 4

1.591 2

1.625 0

15/8-18

UNEF

1.623 5

1.614 8

1.587 4

1.582 4

1.557 3

1.565

1.578

1.588 9

1.595 4

1.625 0

15/8-20

UN

1.623 6

1.615 5

1.591 1

1.586 3

1.564 1

1.571

1.582

1.592 5

1.598 7

1.625 0

111/16-6

UN

1.685 0

1.666 8

1.576 7

1.568 4

1.486 5

1.507

1.538

1.579 2

1.590 0

1.687 5

111/16-8

UN

1.685 3

1.670 3

1.604 1

1.596 6

1.536 5

1.552

1.577

1.606 3

1.616 0

1.687 5

111/16-12

UN

1.685 7

1.674 3

1.631 6

1.625 7

1.586 5

1.597

1.615

1.633 4

1.641 1

1.687 5

111/16-16

UN

1.685 9

1.676 5

1.645 3

1.640 0

1.611 5

1.620

1.634

1.646 9

1.653 8

1.687 5

111/16-18

UNEF

1.686 0

1.677 3

1.649 9

1.644 9

1.619 8

1.627

1.640

1.651 4

1.657 9

1.687 5

111/16-20

UN

1.686 1

1.678 0

1.653 6

1.648 8

1.626 6

1.633

1.645

1.655 0

1.661 3

1.687 5

13/4-5

UNC

1.747 3

1.726 8

1.617 4

1.608 5

1.509 1

1.533

1.567

1.620 1

1.631 7

1.750 0

13/4-6

UN

1.747 5

1.729 3

1.639 2

1.630 9

1.549 0

1.570

1.600

1.641 7

1.652 5

1.750 0

13/4-8

UN

1.747 7

1.732 7

1.666 5

1.659 0

1.598 9

1.615

1.640

1.668 8

1.678 6

1.750 0

13/4-12

UN

1.748 2

1.736 8

1.694 1

1.688 1

1.649 0

1.660

1.678

1.695 9

1.703 7

1.750 0

2级标准系列统一螺纹的极限尺寸(1 3/4~3 1/2)

2级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

2A外螺纹

2B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

13/4-16

UN

1.748 4

1.739 0

1.707 8

1.702 5

1.674 0

1.682

1.696

1.709 4

1.716 3

1.750 0

13/4-20

UN

1.748 5

1.740 4

1.716 0

1.711 2

1.689 0

1.696

1.707

1.717 5

1.723 8

1.750 0

113/16-6

UN

1.810 0

1.791 8

1.701 7

1.693 3

1.611 5

1.632

1.663

1.704 2

1.715 1

1.812 5

113/16-8

UN

1.810 2

1.795 2

1.729 0

1.721 4

1.661 4

1.677

1.702

1.731 3

1.741 2

1.812 5

113/16-12

UN

1.810 7

1.799 3

1.756 6

1.750 6

1.711 5

1.722

1.740

1.758 4

1.766 2

1.812 5

113/16-16

UN

1.810 9

1.801 5

1.770 3

1.765 0

1.736 5

1.745

1.759

1.771 9

1.778 8

1.812 5

113/16-20

UN

1.811 0

1.802 9

1.778 5

1.773 6

1.751 5

1.758

1.770

1.780 0

1.786 3

1.812 5

17/8-6

UN

1.872 5

1.854 3

1.764 2

1.755 8

1.674 0

1.695

1.725

1.766 7

1.777 7

1.875 0

17/8-8

UN

1.872 7

1.857 7

1.791 5

1.783 8

1.723 9

1.740

1.765

1.793 8

1.803 8

1.875 0

17/8-12

UN

1.873 2

1.861 8

1.819 1

1.813 1

1.774 0

1.785

1.803

1.820 9

1.828 7

1.875 0

17/8-16

UN

1.873 4

1.864 0

1.832 8

1.827 5

1.799 0

1.807

1.821

1.834 4

1.841 3

1.875 0

17/8-20

UN

1.873 5

1.865 4

1.841 0

1.836 1

1.814 0

1.821

1.832

1.842 5

1.848 9

1.875 0

115/16-6

UN

1.934 9

1.916 7

1.826 6

1.818 1

1.736 4

1.757

1.788

1.829 2

1.840 3

1.937 5

115/16-8

UN

1.935 2

1.920 2

1.854 0

1.846 3

1.786 4

1.802

1.827

1.856 3

1.866 3

1.937 5

115/16-12

UN

1.935 7

1.924 3

1.881 6

1.875 6

1.836 5

1.847

1.865

1.883 4

1.891 2

1.937 5

115/16-16

UN

1.935 9

1.926 5

1.895 3

1.889 9

1.861 5

1.870

1.884

1.896 9

1.903 9

1.937 5

115/16-20

UN

1.936 0

1.927 9

1.903 5

1.898 6

1.876 5

1.883

1.895

1.905 0

1.911 4

1.937 5

2-41/2

UNC

1.997 1

1.975 1

1.852 8

1.843 3

1.732 5

1.759

1.795

1.855 7

1.868 1

2.000 0

2-6

UN

1.997 4

1.979 2

1.889 1

1.880 5

1.798 9

1.820

1.850

1.891 7

1.902 8

2.000 0

2-8

UN

1.997 7

1.982 7

1.916 5

1.908 7

1.848 9

1.865

1.890

1.918 8

1.928 9

2.000 0

2-12

UN

1.998 2

1.986 8

1.944 1

1.938 0

1.899 0

1.910

1.928

1.945 9

1.953 8

2.000 0

2-16

UN

1.998 4

1.989 0

1.957 8

1.952 4

1.924 0

1.932

1.946

1.959 4

1.966 4

2.000 0

2-20

UN

1.998 5

1.990 4

1.966 0

1.961 1

1.939 0

1.946

1.957

1.967 5

1.973 9

2.000 0

21/8-6

UN

2.122 4

2.104 2

2.014 1

2.005 4

1.923 9

1.945

1.975

2.016 7

2.028 0

2.125 0

21/8-8

UN

2.122 6

2.107 6

2.041 4

2.033 5

1.973 8

1.990

2.015

2.043 8

2.054 0

2.125 0

21/8-12

UN

2.123 2

2.111 8

2.069 1

2.063 0

2.024 0

2.035

2.053

2.070 9

2.077 8

2.125 0

21/8-16

UN

2.123 4

2.114 0

2.082 8

2.077 4

2.049 0

2.057

2.071

2.084 4

2.091 4

2.125 0

21/8-20

UN

2.123 5

2.115 4

2.091 0

2.086 0

2.064 0

2.071

2.082

2.092 5

2.099 0

2.125 0

21/4-41/2

UNC

2.247 1

2.225 1

2.102 8

2.093 1

1.982 5

2.009

2.045

2.105 7

2.118 3

2.250 0

21/4-6

UN

2.247 4

2.229 2

2.139 1

2.130 3

2.048 9

2.070

2.100

2.141 7

2.153 1

2.250 0

21/4-8

UN

2.247 6

2.232 6

2.166 4

2.158 4

2.098 8

2.115

2.140

2.168 8

2.179 2

2.250 0

21/4-12

UN

2.248 2

2.236 8

2.194 1

2.188 0

2.149 0

2.160

2.178

2.195 9

2.203 9

2.250 0

21/4-16

UN

2.248 4

2.239 0

2.207 8

2.202 3

2.174 0

2.182

2.196

2.209 4

2.216 5

2.250 0

21/4-20

UN

2.248 5

2.240 4

2.216 0

2.211 0

2.189 0

2.196

2.207

2.217 5

2.224 0

2.250 0

23/8-6

UN

2.372 3

2.354 1

2.264 0

2.255 1

2.173 8

2.195

2.225

2.266 7

2.278 2

2.375 0

23/8-8

UN

2.3726

2.357 6

2.291 4

2.283 3

2.223 8

2.240

2.265

2.293 8

2.304 3

2.375 0

23/8-12

UN

2.373 2

2.361 8

2.319 1

2.312 9

2.274 0

2.285

2.303

2.320 9

2.328 9

2.375 0

23/8-16

UN

2.373 4

2.364 0

2.332 8

2.327 3

2.299 0

2.307

2.321

2.334 4

2.341 5

2.375 0

23/8-20

UN

2.373 5

2.365 4

2.341 0

2.336 0

2.314 0

2.321

2.332

2.342 5

2.349 1

2.375 0

21/2-4

UNC

2.496 9

2.473 1

2.334 5

2.324 1

2.199 2

2.229

2.267

2.337 6

2.351 1

2.500 0

21/2-6

UN

2.497 3

2.479 1

2.389 0

2.380 0

2.298 8

2.320

2.350

2.391 7

2.403 3

2.500 0

21/2-8

UN

2.497 6

2.482 6

2.416 4

2.408 2

2.348 8

2.365

2.390

2.418 8

2.429 4

2.500 0

21/2-12

UN

2.498 1

2.486 7

2.444 0

2.437 8

2.398 9

2.410

2.428

2.445 9

2.454 0

2.500 0

21/2-16

UN

2.498 3

2.488 9

2.457 7

2.452 2

2.423 9

2.432

2.446

2.459 4

2.466 6

2.500 0

21/2-20

UN

2.498 5

2.490 4

2.466 0

2.460 9

2.439 0

2.446

2.457

2.467 5

2.474 1

2.500 0

25/8-6

UN

2.622 3

2.604 1

2.514 0

2.505 0

2.423 8

2.445

2.475

2.516 7

2.528 5

2.625 0

25/8-8

UN

2.622 5

2.607 5

2.541 3

2.533 1

2.473 7

2.490

2.515

2.543 8

2.554 5

2.625 0

25/8-12

UN

2.623 1

2.611 7

2.569 0

2.562 8

2.523 9

2.535

2.553

2.570 9

2.579 0

2.625 0

25/8-16

UN

2.623 3

2.613 9

2.582 7

2.577 1

2.548 9

2.557

2.571

2.584 4

2.591 6

2.625 0

25/8-20

UN

2.623 5

2.615 4

2.591 0

2.585 9

2.564 0

2.571

2.582

2.592 5

2.599 1

2.625 0

23/4-4

UNC

2.746 8

2.723 0

2.584 4

2.573 9

2.449 1

2.479

2.517

2.587 6

2.601 3

2.750 0

23/4-6

UN

2.747 3

2.729 1

2.639 0

2.629 9

2.548 8

2.570

2.600

2.641 7

2.653 6

2.750 0

23/4-8

UN

2.747 5

2.732 5

2.666 3

2.658 0

2.598 7

2.615

2.640

2.668 8

2.679 6

2.750 0

23/4-12

UN

2.748 1

2.736 7

2.694 0

2.687 7

2.648 9

2.660

2.678

2.695 9

2.704 0

2.750 0

23/4-16

UN

2.748 3

2.738 9

2.707 7

2.702 1

2.673 9

2.682

2.696

2.709 4

2.716 7

2.750 0

23/4-20

UN

2.748 5

2.740 4

2.716 0

2.710 9

2.689 0

2.696

2.707

2.717 5

2.724 2

2.750 0

27/8-6

UN

2.872 2

2.854 0

2.763 9

2.754 7

2.673 7

2.695

2.725

2.766 7

2.778 7

2.875 0

27/8-8

UN

2.872 5

2.857 5

2.791 3

2.782 9

2.723 7

2.740

2.765

2.793 8

2.804 8

2.875 0

27/8-12

UN

2.873 1

2.861 7

2.819 0

2.812 7

2.773 9

2.785

2.803

2.820 9

2.829 1

2.875 0

27/8-16

UN

2.873 3

2.863 9

2.832 7

2.827 1

2.798 9

2.807

2.821

2.834 4

2.841 7

2.875 0

27/8-20

UN

2.873 4

2.865 3

2.840 9

2.835 7

2.813 9

2.821

2.832

2.842 5

2.849 2

2.8750

3-4

UNC

2.996 8

2.973 0

2.834 4

2.823 7

2.699 1

2.729

2.767

2.837 6

2.851 5

3.000 0

3-6

UN

2.997 2

2.979 0

2.888 9

2.879 6

2.798 7

2.820

2.850

2.891 7

2.903 8

3.000 0

3-8

UN

2.997 4

2.982 4

2.916 2

2.907 7

2.848 6

2.865

2.890

2.918 8

2.929 9

3.000 0

3-12

UN

2.998 1

2.986 7

2.944 0

2.933 7

2.898 9

2.910

2.928

2.945 9

2.954 1

3.000 0

3-16

UN

2.998 3

2.988 9

2.957 7

2.952 1

2.923 9

2.932

2.946

2.959 4

2.966 7

3.000 0

3-20

UN

2.998 4

2.990 3

2.965 9

2.960 7

2.938 9

2.946

2.957

2.967 5

2.974 3

3.000 0

31/8-6

UN

3.122 2

3.104 0

3.013 9

3.004 5

2.923 7

2.945

2.975

3.016 7

3.028 9

3.125 0

31/8-8

UN

3.122 4

3.107 4

3.041 2

3.032 6

2.973 6

2.990

3.015

3.043 8

3.055 0

3.125 0

31/8-12

UN

3.123 1

3.111 7

3.069 0

3.062 6

3.023 9

3.035

3.053

3.070 9

3.079 2

3.125 0

31/8-16

UN

3.123 3

3.113 9

3.082 7

3.077 0

3.048 9

3.057

3.071

3.084 4

3.091 8

3.125 0

31/4-4

UNC

3.246 7

3.222 9

3.084 3

3.073 4

2.949 0

2.979

3.017

3.087 6

3.101 7

3.250 0

31/4-6

UN

3.247 2

3.229 0

3.138 9

3.129 4

3.048 7

3.070

3.100

3.141 7

3.154 0

3.250 0

31/4-8

UN

3.247 4

3.232 4

3.166 2

3.157 5

3.098 6

3.115

3.140

3.168 8

3.180 1

3.250 0

31/4-12

UN

3.248 1

3.236 7

3.194 0

3.187 6

3.148 9

3.160

3.178

3.195 9

3.204 2

3.250 0

31/4-16

UN

3.248 3

3.238 9

3.207 7

3.202 0

3.173 9

3.182

3.196

3.209 4

3.216 8

3.250 0

33/8-6

UN

3.372 1

3.353 9

3.263 8

3.254 3

3.173 6

3.195

3.225

3.266 7

3.279 1

3.375 0

33/8-8

UN

3.372 4

3.357 4

3.291 2

3.282 4

3.223 6

3.240

3.265

3.293 8

3.305 2

3.375 0

33/8-12

UN

3.373 1

3.361 7

3.319 0

3.312 6

3.273 9

3.285

3.303

3.320 9

3.329 2

3.375 0

33/8-16

UN

3.373 3

3.363 9

3.332 7

3.327 0

3.298 9

3.307

3.321

3.334 4

3.341 9

3.375 0

31/2-4

UNC

3.496 7

3.472 9

3.334 3

3.323 3

3.199 0

3.229

3.267

3.337 6

3.351 9

3.500 0

31/2-6

UN

3.497 1

3.478 9

3.388 3

3.379 2

3.298 6

3.320

3.350

3.391 7

3.404 2

3.500 0

31/2-8

UN

3.497 4

3.482 4

3.416 2

3.407 4

3.348 6

3.365

3.390

3.418 8

3.430 3

3.500 0

31/2-12

UN

3.498 1

3.486 7

3.444 0

3.437 6

3.398 9

3.410

3.428

3.445 9

3.454 3

3.500 0

2级标准系列统一螺纹的极限尺寸(3 1/2~6)

2级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

2A外螺纹

2B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

31/2-16

UN

3.498 3

3.488 9

3.457 7

3.451 9

3.423 9

3.432

3.446

3.459 4

3.466 9

3.500 0

35/8-6

UN

3.622 1

3.603 9

3.513 8

3.504 1

3.423 6

3.445

3.475

3.516 7

3.529 3

3.625 0

35/8-8

UN

3.622 3

3.607 3

3.541 1

3.532 2

3.473 5

3.490

3.515

3.543 8

3.555 4

3.625 0

35/8-12

UN

3.623 1

3.611 7

3.569 0

3.562 5

3.523 9

3.535

3.553

3.570 9

3.579 3

3.625 0

35/8-16

UN

3.623 3

3.613 9

3.582 7

3.576 9

3.548 9

3.557

3.571

3.584 4

3.591 9

3.625 0

33/4-4

UNC

3.746 6

3.722 8

3.584 2

3.573 0

3.448 9

3.479

3.517

3.587 6

3.602 1

3.750 0

33/4-6

UN

3.747 1

3.728 9

3.638 8

3.629 0

3.548 6

3.570

3.600

3.641 7

3.654 4

3.750 0

33/4-8

UN

3.747 3

3.732 3

3.666 1

3.657 1

3.598 5

3.615

3.640

3.668 8

3.680 5

3.750 0

33/4-12

UN

3.748 1

3.736 7

3.694 0

3.687 5

3.648 9

3.660

3.678

3.695 9

3.704 3

3.750 0

33/4-16

UN

3.748 3

3.738 9

3.707 7

3.701 9

3.673 9

3.682

3.969

3.709 4

3.717 0

3.750 0

37/8-6

UN

3.872 0

3.853 8

3.763 7

3.753 8

3.673 5

3.695

3.725

3.766 7

3.779 5

3.875 0

37/8-8

UN

3.872 3

3.857 3

3.791 1

3.782 0

3.723 5

3.740

3.765

3.793 8

3.805 6

3.875 0

37/8-12

UN

3.873 0

3.861 6

3.818 9

3.812 4

3.773 8

3.785

3.803

3.820 9

3.829 4

3.875 0

37/8-16

UN

3.873 2

3.863 8

3.832 6

3.826 8

3.798 8

3.807

3.821

3.834 4

3.842 0

3.875 0

4-4

UNC

3.996 6

3.972 8

3.834 2

3.822 9

3.698 9

3.729

3.767

3.837 6

3.852 3

4.000 0

4-6

UN

3.997 0

3.978 8

3.888 7

3.878 8

3.798 5

3.820

3.850

3.891 7

3.904 6

4.000 0

4-8

UN

3.997 3

3.982 3

3.916 1

3.907 0

3.848 5

3.865

3.890

3.918 8

3.930 7

4.000 0

4-12

UN

3.998 0

3.986 6

3.943 9

3.937 4

3.898 8

3.910

3.928

3.945 9

3.954 4

4.000 0

4-16

UN

3.998 2

3.988 8

3.957 6

3.951 7

3.923 8

3.932

3.946

3.959 4

3.967 0

4.000 0

41/8-6

UN

4.122 0

4.103 8

4.013 7

4.003 7

3.923 5

3.945

3.975

4.016 7

4.029 7

4.125 0

41/8-8

UN

4.122 2

4.107 2

4.041 0

4.031 8

3.973 4

3.990

4.015

4.043 8

4.058 8

4.125 0

41/8-12

UN

4.123 0

4.111 6

4.068 9

4.062 3

4.023 8

4.035

4.053

4.070 9

4.079 4

4.125 0

41/8-16

UN

4.123 2

4.113 8

4.082 6

4.076 7

4.048 8

4.057

4.071

4.084 4

4.092 1

4.125 0

41/4-4

UN

4.246 6

4.222 8

4.084 2

4.072 7

3.948 9

3.979

4.017

4.087 6

4.102 5

4.250 0

41/4-6

UN

4.247 0

4.228 8

4.138 7

4.128 6

4.048 5

4.070

4.100

4.141 7

4.154 8

4.250 0

41/4-8

UN

4.247 2

4.232 2

4.166 0

4.156 7

4.098 4

4.115

4.140

4.168 8

4.180 9

4.250 0

41/4-12

UN

4.248 0

4.236 6

4.193 9

4.187 3

4.148 8

4.160

4.178

4.195 9

4.204 5

4.250 0

41/4-16

UN

4.248 2

4.238 8

4.207 6

4.201 7

4.173 8

4.182

4.196

4.209 4

4.217 1

4.250 0

43/8-6

UN

4.372 0

4.353 8

4.263 7

4.253 6

4.173 5

4.195

4.225

4.266 7

4.279 9

4.375 0

43/8-8

UN

4.372 2

4.357 2

4.291 0

4.281 7

4.223 4

4.240

4.265

4.293 8

4.305 9

4.375 0

43/8-12

UN

4.373 0

4.361 6

4.318 9

4.312 3

4.273 8

4.285

4.303

4.320 9

4.329 5

4.375 0

43/8-16

UN

4.373 2

4.363 8

4.332 6

4.326 7

4.298 8

4.307

4.321

4.334 4

4.342 1

4.375 0

41/2-4

UN

4.496 5

4.472 7

4.334 1

4.322 5

4.198 8

4.229

4.267

4.337 6

4.352 7

4.500 0

41/2-6

UN

4.496 9

4.478 7

4.388 6

4.378 4

4.298 4

4.320

4.350

4.391 7

4.405 0

4.500 0

41/2-8

UN

4.497 2

4.482 2

4.416 0

4.406 6

4.348 4

4.365

4.390

4.418 8

4.431 0

4.500 0

41/2-12

UN

4.498 0

4.486 6

4.443 9

4.437 3

4.398 8

4.410

4.428

4.445 9

4.454 5

4.500 0

41/2-16

UN

4.498 2

4.488 8

4.457 6

4.451 6

4.423 8

4.432

4.446

4.459 4

4.467 2

4.500 0

45/8-6

UN

4.621 9

4.603 7

4.513 6

4.503 3

4.423 4

4.445

4.475

4.516 7

4.530 0

4.625 0

45/8-8

UN

4.622 2

4.607 2

4.541 0

4.531 5

4.473 4

4.490

4.515

4.543 8

4.556 1

4.625 0

45/8-12

UN

4.623 0

4.611 6

4.568 9

4.562 2

4.523 8

4.535

4.553

4.570 9

4.579 6

4.625 0

45/8-16

UN

4.623 2

4.613 8

4.582 6

4.576 6

4.548 8

4.557

4.571

4.584 4

4.592 2

4.625 0

43/4-4

UN

4.746 5

4.722 7

4.584 1

4.572 4

4.448 8

4.479

4.517

4.587 6

4.602 9

4.750 0

43/4-6

UN

4.746 9

4.728 7

4.638 6

4.628 3

4.548 4

4.570

4.600

4.641 7

4.655 1

4.750 0

43/4-8

UN

4.747 1

4.732 1

4.665 9

4.656 4

4.598 3

4.615

4.640

4.668 8

4.681 2

4.750 0

43/4-12

UN

4.748 0

4.736 6

4.693 9

4.687 2

4.648 8

4.660

4.678

4.695 9

4.704 6

4.750 0

43/4-16

UN

4.748 2

7.738 8

4.707 6

4.701 6

4.673 8

4.682

4.696

4.709 4

4.7172

4.750 0

47/8-6

UN

4.871 9

4.853 7

4.763 6

4.753 2

4.673 4

4.695

4.725

4.766 7

4.780 2

4.875 0

47/8-8

UN

4.872 1

4.857 1

4.790 9

4.781 3

4.723 3

4.740

4.765

4.793 8

4.806 3

4.875 0

47/8-12

UN

4.873 0

4.861 6

4.818 9

4.812 2

4.773 8

4.785

4.803

4.820 9

4.829 6

4.875 0

47/8-16

UN

4.873 2

4.863 8

4.832 6

4.826 6

4.798 8

4.807

4.821

4.834 4

4.842 2

4.875 0

5-4

UN

4.996 4

4.972 6

4.834 0

4.822 1

4.698 7

4.729

4.767

4.837 6

4.853 0

5.000 0

5-6

UN

4.996 9

4.978 7

4.888 6

4.878 1

4.798 4

4.820

4.850

4.891 7

4.905 3

5.000 0

5-8

UN

4.997 1

4.982 1

4.915 9

4.906 2

4.848 3

4.865

4.890

4.918 8

4.931 4

5.000 0

5-12

UN

4.998 0

4.986 6

4.943 9

4.937 2

4.898 8

4.910

4.928

4.945 9

4.954 6

5.000 0

5-16

UN

4.998 2

4.988 8

4.957 6

4.951 5

4.923 8

4.932

4.946

4.959 4

4.967 3

5.000 0

51/8-6

UN

5.121 8

5.103 6

5.013 5

5.003 0

4.923 3

4.945

4.975

5.016 7

5.030 4

5.125 0

51/8-8

UN

5.122 1

5.107 1

5.040 9

5.031 2

4.973 3

4.990

5.015

5.043 8

5.056 5

5.125 0

51/8-12

UN

5.123 0

5.111 6

5.068 9

5.062 2

5.023 8

5.035

5.053

5.070 9

5.079 7

5.125 0

51/8-16

UN

5.123 2

5.113 8

5.082 6

5.076 5

5.048 8

5.057

5.071

5.084 4

5.0923

5.125 0

51/4-4

UN

5.246 4

5.222 6

5.084 0

5.072 0

4.948 7

4.979

5.017

5.087 6

5.103 2

5.250 0

51/4-6

UN

5.246 8

5.228 6

5.138 5

5.127 9

5.048 3

5.070

5.100

5.141 7

5.155 5

5.250 0

51/4-8

UN

5.247 1

5.232 1

5.165 9

5.156 1

5.098 3

5.115

5.140

5.168 8

5.181 5

5.250 0

51/4-12

UN

5.248 0

5.236 6

5.193 9

5.187 1

5.148 8

5.160

5.178

5.195 9

5.204 7

5.250 0

51/4-16

UN

5.248 2

5.238 8

5.207 6

5.204 5

5.173 8

5.182

5.196

5.209 4

5.217 3

5.250 0

53/8-6

UN

5.371 8

5.353 6

5.263 5

5.252 9

5.173 3

5.195

5.225

5.266 7

5.280 5

5.375 0

53/8-8

UN

5.372 0

5.357 0

5.290 8

5.280 9

5.223 2

5.240

5.265

5.293 8

5.306 6

5.375 0

53/8-12

UN

5.373 0

5.361 6

5.318 9

5.312 1

5.273 8

5.285

5.303

5.320 9

5.3297

5.375 0

53/8-16

UN

5.373 2

5.363 8

5.332 6

5.326 5

5.298 8

5.307

5.321

5.334 4

5.342 3

5.375 0

51/2-4

UN

5.496 4

5.472 6

5.334 0

5.321 9

5.198 7

5.229

5.267

5.337 6

5.353 4

5.500 0

51/2-6

UN

5.496 8

5.478 6

5.388 5

5.377 8

5.298 3

5.320

5.350

5.391 7

5.405 6

5.500 0

51/2-8

UN

5.497 0

5.482 0

5.415 8

5.405 9

5.348 2

5.365

5.390

5.418 8

5.431 7

5.500 0

51/2-12

UN

5.498 0

5.486 6

5.443 9

5.437 1

5.398 8

5.410

5.428

5.445 9

5.454 8

5.500 0

51/2-16

UN

5.498 2

5.488 8

5.457 6

5.451 5

5.423 8

5.432

5.446

5.459 4

5.467 4

5.500 0

55/8-6

UN

5.621 8

5.603 6

5.513 5

5.502 7

5.423 3

5.445

5.475

5.516 7

5.530 7

5.625 0

55/8-8

UN

5.622 0

5.607 0

5.540 8

5.530 8

5.473 2

5.490

5.515

5.543 8

5.556 8

5.625 0

55/8-12

UN

5.623 0

5.611 6

5.5689

5.562 1

5.523 8

5.535

5.553

5.570 9

5.579 8

5.625 0

55/8-16

UN

5.623 2

5.613 8

5.582 6

5.576 4

5.548 8

5.557

5.571

5.584 4

5.592 4

5.625 0

53/4-4

UN

5.746 3

5.722 5

5.583 9

5.571 7

5.448 6

5.479

5.517

5.587 6

5.603 5

5.750 0

53/4-6

UN

5.746 8

5.728 6

5.638 5

5.627 7

5.548 3

5.570

5.600

5.641 7

5.655 8

5.750 0

53/4-8

UN

5.747 0

5.732 0

5.665 8

5.655 8

5.598 2

5.615

5.640

5.668 8

5.681 8

5.750 0

53/4-12

UN

5.747 9

5.736 5

5.693 8

5.687 0

5.648 7

5.660

5.678

5.695 9

5.704 8

5.750 0

53/4-16

UN

5.748 1

5.738 7

5.707 5

5.701 3

5.673 7

5.682

5.696

5.709 4

5.717 4

5.750 0

57/8-6

UN

5.871 7

5.853 5

5.763 4

5.752 5

5.673 2

5.695

5.725

5.766 7

5.780 9

5.875 0

57/8-8

UN

5.872 0

5.857 0

5.790 8

5.780 7

5.723 2

5.740

5.765

5.793 8

5.806 9

5.875 0

57/8-12

UN

5.872 9

5.861 5

5.818 8

5.811 9

5.773 7

5.785

5.803

5.820 9

5.829 8

5.875 0

57/8-16

UN

5.873 1

5.863 7

5.832 5

5.826 3

5.798 7

5.807

5.821

5.834 4

5.842 5

5.875 0

6-4

UN

5.996 3

5.972 5

5.833 9

5.821 5

5.698 6

5.729

5.767

5.837 6

5.853 7

6.000 0

6-6

UN

5.996 7

5.978 5

5.888 4

5.877 5

5.798 2

5.820

5.850

5.891 7

5.905 9

6.000 0

6-8

UN

5.997 0

5.982 0

5.915 8

5.905 7

5.848 2

5.865

5.890

5.918 8

5.932 0

6.000 0

6-12

UN

5.997 9

5.986 5

5.943 8

5.936 9

5.898 7

5.910

5.928

5.945 9

5.954 9

6.000 0

6-16

UN

5998 1

5.988 7

5.957 5

5.951 3

5.923 7

5.932

5.946

5.959 4

5.987 5

6.000 0

3级标准系列统一螺纹的极限尺寸(0~15/16)

3级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

3A外螺纹

3B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

0-80

UNF

0.0600

0.0568

0.0519

0.0506

0.0451

0.0465

0.0514

0.0519

0.0536

0.0600

1-64

UNC

0.0730

0.0692

0.0629

0.0614

0.0544

0.0561

0.0622

0.0629

0.0648

0.0730

1-72

UNF

0.0730

0.0695

0.0640

0.0626

0.0565

0.0580

0.0634

0.0640

0.0659

0.0730

2-56

UNC

0.0860

0.0819

0.0744

0.0728

0.0647

0.0667

0.0737

0.0744

0.0765

0.0860

2-64

UNF

0.0860

0.0822

0.0759

0.0744

0.0674

0.0691

0.0752

0.0759

0.0779

0.0860

3-48

UNC

0.0990

0.0945

0.0855

0.0838

0.0742

0.0764

0.0845

0.0855

0.0877

0.0990

3-56

UNF

0.0990

0.0949

0.0874

0.0858

0.0777

0.0797

0.0865

0.0874

0.0895

0.0990

4-40

UNC

0.1120

0.1069

0.0958

0.0939

0.0822

0.0849

0.0939

0.0958

0.0982

0.1120

4-48

UNF

0.1120

0.1075

0.0985

0.0967

0.0872

0.0894

0.0968

0.0985

0.1008

0.1120

5-40

UNC

0.1250

0.1199

0.1088

0.1069

0.0952

0.0979

0.1062

0.1088

0.1113

0.1250

5-44

UNF

0.1250

0.1202

0.1102

0.1083

0.0979

0.1004

0.1079

0.1102

0.1126

0.1250

6-32

UNC

0.1380

0.1320

0.1177

0.1156

0.1008

0.1040

0.1139

0.1177

0.1204

0.1380

6-40

UNF

0.1380

0.1329

0.1218

0.1198

0.1082

0.1110

0.1186

0.1218

0.1243

0.1380

8-32

UNC

0.1640

0.1580

0.1437

0.1415

0.1268

0.1300

0.1388

0.1437

0.1465

0.1640

8-36

UNF

0.1640

0.1585

0.1460

0.1439

0.1309

0.1340

0.1416

0.1460

0.1487

0.1640

10-24

UNC

0.1900

0.1828

0.1629

0.1604

0.1404

0.1450

0.1555

0.1629

0.1661

0.1900

10-32

UNF

0.1900

0.1840

0.1697

0.1674

0.1528

0.1560

0.1641

0.1697

0.1726

0.1900

12-24

UNC

0.2160

0.2088

0.1889

0.1863

0.1664

0.1710

0.1807

0.1889

0.1922

0.2160

12-28

UNF

0.2160

0.2095

0.1928

0.1904

0.1735

0.1770

0.1857

0.1928

0.1959

0.2160

12-32

UNEF

0.2160

0.2100

0.1957

0.1933

0.1788

0.1820

0.1895

0.1957

0.1988

0.2160

1/4-20

UNC

0.2500

0.2419

0.2175

0.2147

0.1905

0.1960

0.2067

0.2175

0.2211

0.2500

1/4-28

UNF

0.2500

0.2435

0.2268

0.2243

0.2075

0.2110

0.2190

0.2268

0.2300

0.2500

1/4-32

UNEF

0.2500

0.2440

0.2297

0.2273

0.2128

0.2160

0.2229

0.2297

0.2328

0.2500

5/16-18

UNC

0.3125

0.3038

0.2764

0.2734

0.2463

0.2520

0.2630

0.2764

0.2803

0.3125

5/16-20

UN

0.3125

0.3044

0.2800

0.2770

0.2530

0.2580

0.2680

0.2800

0.2840

0.3125

5/16-24

UNF

0.3125

0.3053

0.2854

0.2827

0.2629

0.2670

0.2754

0.2854

0.2890

0.3125

5/16-28

UN

0.3125

0.3060

0.2893

0.2867

0.2700

0.2740

0.2807

0.2893

0.2927

0.3125

5/16-32

UNEF

0.3125

0.3065

0.2922

0.2897

0.2753

0.2790

0.5746

0.2922

0.2954

0.3125

3/8-16

UNC

0.3750

0.3656

0.3344

0.3311

0.3006

0.3070

0.3182

0.3344

0.3387

0.3750

3/8-20

UN

0.3750

0.3669

0.3425

0.3394

0.3155

0.3210

0.3297

0.3425

0.3465

0.3750

3/8-24

UNF

0.3750

0.3678

0.3479

0.3450

0.3254

0.3300

0.3372

0.3479

0.3516

0.3750

3/8-28

UN

0.3750

0.3685

0.3518

0.3491

0.3325

0.3360

0.3426

0.3518

0.3553

0.3750

3/8-32

UNEF

0.3750

0.3690

0.3547

0.3522

0.3378

0.3410

0.3469

0.3547

0.3580

0.3750

7/16-14

UNC

0.4375

0.4272

0.3911

0.3876

0.3524

0.3600

0.3717

0.3911

0.3957

0.4375

7/16-16

UN

0.4375

0.4281

0.3969

0.3934

0.3631

0.3700

0.3800

0.3969

0.4014

0.4375

7/16-20

UNF

0.4375

0.4294

0.4050

0.4019

0.3780

0.3830

0.3916

0.4050

0.4091

0.4375

7/16-28

UNEF

0.4375

0.4310

0.4143

0.4116

0.3950

0.3990

0.4051

0.4143

0.4178

0.4375

7/16-32

UN

0.4375

0.4315

0.4172

0.4146

0.4003

0.4040

0.4094

0.4172

0.4205

0.4375

1/2-13

UNC

0.5000

0.4891

0.4500

0.4463

0.4084

0.4170

0.4284

0.4500

0.4548

0.5000

1/2-16

UN

0.5000

0.4906

0.4594

0.4559

0.4256

0.4320

0.4420

0.4594

0.4640

0.5000

1/2-20

UNF

0.5000

0.4919

0.4675

0.4643

0.4405

0.4460

0.4537

0.4675

0.4717

0.5000

1/2-28

UNEF

0.5000

0.4935

0.4768

0.4740

0.4575

0.4610

0.4676

0.4768

0.4804

0.5000

1/2-32

UN

0.5000

0.4940

0.4797

0.4771

0.4628

0.4660

0.4719

0.4797

0.4831

0.5000

9/16-12

UNC

0.5625

0.5511

0.5084

0.5045

0.4633

0.4720

0.4843

0.5084

0.5135

0.5625

9/16-16

UN

0.5625

0.5531

0.5219

0.5184

0.4881

0.4950

0.5041

0.5219

0.5265

0.5625

9/16-18

UNF

0.5625

0.5538

0.5264

0.5230

0.4963

0.5020

0.5106

0.5264

0.5308

0.5625

9/16-20

UN

0.5625

0.5544

0.5300

0.5268

0.5030

0.5080

0.5161

0.5300

0.5342

0.5625

9/16-24

UNEF

0.5625

0.5553

0.5354

0.5324

0.5129

0.5170

0.5244

0.5354

0.5393

0.5625

9/16-28

UN

0.5625

0.5560

0.5393

0.5365

0.5200

0.5240

0.5301

0.5393

0.5429

0.5625

9/16-32

UN

0.5625

0.5565

0.5422

0.5396

0.5253

0.5290

0.5344

0.5422

0.5456

0.5625

5/8-11

UNC

0.6250

0.6129

0.5660

0.5619

0.5167

0.5270

0.5391

0.5660

0.5714

0.6250

5/8-12

UN

0.6250

0.6136

0.5709

0.5668

0.5258

0.5350

0.5463

0.5709

0.5762

0.6250

5/8-16

UN

0.6250

0.6156

0.5844

0.5808

0.5506

0.5570

0.5662

0.5844

0.5890

0.6250

5/8-18

UNF

0.6250

0.6163

0.5889

0.5854

0.5588

0.5650

0.5730

0.5889

0.5934

0.6250

5/8-20

UN

0.6250

0.6169

0.5925

0.5893

0.5655

0.5710

0.5786

0.5925

0.5967

0.6250

5/8-24

UNEF

0.6250

0.6178

0.5979

0.5949

0.5754

0.5800

0.5869

0.5979

0.6018

0.6250

5/8-28

UN

0.6250

0.6185

0.6018

0.5990

0.5825

0.5860

0.5926

0.6018

0.6055

0.6250

5/8-32

UN

0.6250

0.6190

0.6047

0.6020

0.5878

0.5910

0.5969

0.6047

0.6082

0.6250

11/16-12

UN

0.6875

0.6761

0.6334

0.6293

0.5883

0.5970

0.6085

0.6334

0.6387

0.6875

11/16-16

UN

0.6875

0.6781

0.6469

0.6433

0.6131

0.6200

0.6284

0.6469

0.6516

0.6875

11/16-20

UN

0.6875

0.6794

0.6550

0.6517

0.6280

0.6330

0.6411

0.6550

0.6593

0.6875

11/16-24

UNEF

0.6875

0.6803

0.6604

0.6574

0.6379

0.6420

0.6494

0.6604

0.6643

0.6875

11/16-28

UN

0.6875

0.6810

0.6643

0.6614

0.6450

0.6490

0.6551

0.6643

0.6680

0.6875

11/16-32

UN

0.6875

0.6815

0.6672

0.6645

0.6503

0.6540

0.6594

0.6672

0.6707

0.6875

3/4-10

UNC

0.7500

0.7371

0.6850

0.6806

0.6309

0.6420

0.6545

0.6850

0.6907

0.7500

3/4-12

UN

0.7500

0.7386

0.6959

0.6918

0.6508

0.6600

0.6707

0.6959

0.7013

0.7500

3/4-16

UNF

0.7500

0.7406

0.7094

0.7056

0.6756

0.6820

0.6909

0.7094

0.7143

0.7500

3/4-20

UNEF

0.7500

0.7419

0.7175

0.7142

0.6905

0.6960

0.7036

0.7175

0.7218

0.7500

3/4-28

UN

0.7500

0.7435

0.7268

0.7239

0.7075

0.7110

0.7176

0.7268

0.7305

0.7500

3/4-32

UN

0.7500

0.7440

0.7297

0.7270

0.7128

0.7160

0.7219

0.7297

0.7333

0.7500

13/16-12

UN

0.8125

0.8011

0.7584

0.7542

0.7133

0.7220

0.7329

0.7584

0.7638

0.8125

13/16-16

UN

0.8125

0.8031

0.7719

0.7682

0.7381

0.7450

0.7534

0.7719

0.7767

0.8125

13/16-20

UNEF

0.8125

0.8044

0.7800

0.7767

0.7530

0.7580

0.7661

0.7800

0.7843

0.8125

13/16-28

UN

0.8125

0.8060

0.7893

0.7864

0.7700

0.7740

0.7801

0.7893

0.7931

0.8125

13/16-32

UN

0.8125

0.8065

0.7922

0.7894

0.7753

0.7790

0.7844

0.7922

0.7958

0.8125

7/8-9

UNC

0.8750

0.8611

0.8028

0.7981

0.7427

0.7550

0.7681

0.8028

0.8089

0.8750

7/8-12

UN

0.8750

0.8636

0.8209

0.8167

0.7758

0.7850

0.7952

0.8209

0.8264

0.8750

7/8-14

UNF

0.8750

0.8647

0.8286

0.8245

0.7899

0.7980

0.8067

0.8286

0.8339

0.8750

7/8-16

UN

0.8750

0.8656

0.8344

0.8307

0.8006

0.8070

0.8159

0.8344

0.8392

0.8750

7/8-20

UNEF

0.8750

0.8669

0.8425

0.8391

0.8155

0.8210

0.8286

0.8425

0.8469

0.8750

7/8-28

UN

0.8750

0.8685

0.8518

0.8489

0.8325

0.8360

0.8426

0.8518

0.8556

0.8750

7/8-32

UN

0.8750

0.8690

0.8547

0.8519

0.8378

0.8410

0.8469

0.8547

0.8583

0.8750

15/16-12

UN

0.9375

0.9261

0.8834

0.8792

0.8383

0.8470

0.8575

0.8834

0.8889

0.9375

15/16-16

UN

0.9375

0.9281

0.8969

0.8932

0.8631

0.8700

0.8784

0.8969

0.9017

0.9375

15/16-20

UNEF

0.9375

0.9294

0.9050

0.9016

0.8780

0.8830

0.8911

0.9050

0.9094

0.9375

15/16-28

UN

0.9375

0.9310

0.9143

0.9113

0.8950

0.8990

0.9051

0.9143

0.9181

0.9375

15/16-32

UN

0.9375

0.9315

0.9172

0.9144

0.9003

0.9040

0.9094

0.9172

0.9209

0.9375

3级标准系列统一螺纹的极限尺寸(1~1 3/4)

3级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

3A外螺纹

3B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

1-8

UNC

1.0000

0.9850

0.9188

0.9137

0.8512

0.8650

0.8797

0.9188

0.9254

1.0000

1-12

UNF

1.0000

0.9886

0.9459

0.9415

0.9008

0.9100

0.9198

0.9459

0.9516

1.0000

1-16

UN

1.0000

0.9906

0.9594

0.9557

0.9256

0.9320

0.9409

0.9594

0.9643

1.0000

1-20

UNEF

1.0000

0.9919

0.9675

0.9641

0.9405

0.9460

0.9536

0.9675

0.9719

1.0000

1-28

UN

1.0000

0.9935

0.9768

0.9738

0.9575

0.9610

0.9676

0.9768

0.9807

1.0000

1-32

UN

1.0000

0.9940

0.9797

0.9769

0.9628

0.9660

0.9719

0.9797

0.9834

1.0000

11/16-8

UN

1.0625

1.0475

0.9813

0.9762

0.9137

0.9270

0.9422

0.9813

0.9880

1.0625

11/16-12

UN

1.0625

1.0511

1.0084

1.0041

0.9633

0.9720

0.9823

1.0084

1.0139

1.0625

11/16-16

UN

1.0625

1.0531

1.0219

1.0181

0.9881

0.9950

1.0034

1.0219

1.0268

1.0625

11/16-18

UNEF

1.0625

1.0538

1.0264

1.0228

0.9963

1.0020

1.0105

1.0264

1.0311

1.0625

11/16-20

UN

1.0625

1.0544

1.0300

1.0266

1.0030

1.0080

1.0161

1.0300

1.0345

1.0625

11/16-28

UN

1.0625

1.0560

1.0393

1.0363

1.0200

1.0240

1.0301

1.0393

1.0432

1.0625

11/8-7

UNC

1.1250

1.1086

1.0322

1.0268

0.9549

0.9700

1.0322

1.0322

1.0393

1.1250

11/8-8

UN

1.1250

1.1100

1.0438

1.0386

0.9762

0.9900

1.0438

1.0438

1.0505

1.1250

11/8-12

UNF

1.1250

1.1136

1.0709

1.0664

1.0258

1.0350

1.0709

1.0709

1.0768

1.1250

11/8-16

UN

1.1250

1.1156

1.0844

1.0806

1.0506

1.0570

1.0844

1.0844

1.0893

1.1250

11/8-18

UNEF

1.1250

1.1163

1.0889

1.0853

1.0588

1.0650

1.0889

1.0889

1.0936

1.1250

11/8-20

UN

1.1250

1.1169

1.0925

1.0890

1.0655

1.0710

1.0925

1.0925

1.0970

1.1250

11/8-28

UN

1.1250

1.1185

1.1018

1.0988

1.0825

1.0860

1.1018

1.1018

1.1057

1.1250

13/16-8

UN

1.1875

1.1725

1.1063

1.1011

1.0387

1.0520

1.1063

1.1063

1.1131

1.1875

13/16-12

UN

1.1875

1.1761

1.1334

1.1291

1.0883

1.0970

1.1334

1.1334

1.1390

1.1875

13/16-16

UN

1.1875

1.1781

1.1469

1.1431

1.1131

1.1200

1.1469

1.1469

1.1518

1.1875

13/16-18

UNEF

1.1875

1.1788

1.1514

1.1478

1.1213

1.1270

1.1514

1.1514

1.1561

1.1875

13/16-20

UN

1.1875

1.1794

1.1550

1.1515

1.1280

1.1330

1.1550

1.1550

1.1595

1.1875

13/16-28

UN

1.1875

1.1810

1.1643

1.1613

1.1450

1.1490

1.1643

1.1643

1.1683

1.1875

11/4-7

UNC

1.2500

1.2336

1.1572

1.1517

1.0799

1.0950

1.1572

1.1572

1.1644

1.2500

11/4-8

UN

1.2500

1.2350

1.1688

1.1635

1.1012

1.1150

1.1688

1.1688

1.1757

1.2500

11/4-12

UNF

1.2500

1.2386

1.1959

1.1913

1.1508

1.1600

1.1959

1.1959

1.2019

1.2500

11/4-16

UN

1.2500

1.2406

1.2094

1.2056

1.1756

1.1820

1.2094

1.2094

1.2144

1.2500

11/4-18

UNEF

1.2500

1.2413

1.2139

1.2103

1.1838

1.1900

1.2139

1.2139

1.2186

1.2500

11/4-20

UN

1.2500

1.2419

1.2175

1.2140

1.1905

1.1960

1.2175

1.2175

1.2220

1.2500

11/4-28

UN

1.2500

1.2435

1.2268

1.2237

1.2075

1.2110

1.2268

1.2268

1.2308

1.2500

15/16-8

UN

1.3125

1.2975

1.2313

1.2260

1.1637

1.1770

1.2313

1.2313

1.2382

1.3125

15/16-12

UN

1.3125

1.3011

1.2584

1.2540

1.2133

1.2220

1.2584

1.2584

1.2641

1.3125

15/16-16

UN

1.3125

1.3031

1.2719

1.2681

1.2381

1.2450

1.2719

1.2719

1.2769

1.3125

15/16-18

UNEF

1.3125

1.3038

1.2764

1.2727

1.2463

1.2520

1.2764

1.2764

1.2812

1.3125

15/16-20

UN

1.3125

1.3044

1.2800

1.2765

1.2530

1.2580

1.2800

1.2800

1.2846

1.3125

15/16-28

UN

1.3125

1.3060

1.2893

1.2862

1.2700

1.2740

1.2893

1.2893

1.2933

1.3125

13/8-6

UNC

1.3750

1.3568

1.2667

1.2607

1.1765

1.1950

1.2667

1.2667

1.2745

1.3750

13/8-8

UN

1.3750

1.3600

1.2938

1.2884

1.2262

1.2400

1.2938

1.2938

1.3008

1.3750

13/8-12

UNF

1.3750

1.3636

1.3209

1.3162

1.2758

1.2580

1.2948

1.3209

1.3270

1.3750

13/8-16

UN

1.3750

1.3656

1.3344

1.3305

1.3006

1.3070

1.3159

1.3344

1.3394

1.3750

13/8-18

UNEF

1.3750

1.3663

1.3389

1.3352

1.3088

1.3150

1.3230

1.3389

1.3437

1.3750

13/8-20

UN

1.3750

1.3669

1.3425

1.3390

1.3155

1.3210

1.3286

1.3425

1.3471

1.3750

13/8-28

UN

1.3750

1.3685

1.3518

1.3487

1.3325

1.3360

1.3426

1.3518

1.3558

1.3750

17/16-6

UN

1.4375

1.4193

1.3292

1.3232

1.2390

1.2570

1.2771

1.3292

1.3370

1.4375

17/16-8

UN

1.4375

1.4225

1.3563

1.3509

1.2887

1.3020

1.3172

1.3563

1.3634

1.4375

17/16-12

UN

1.4375

1.4261

1.3834

1.3790

1.3383

1.3470

1.3573

1.3834

1.3891

1.4375

17/16-16

UN

1.4375

1.4281

1.3969

1.3930

1.3631

1.3700

1.3784

1.3969

1.4020

1.4375

17/16-18

UNEF

1.4375

1.4288

1.4014

1.3977

1.3713

1.3770

1.3855

1.4014

1.4062

1.4375

17/16-20

UN

1.4375

1.4294

1.4050

1.4014

1.3780

1.3830

1.3911

1.4050

1.4096

1.4375

17/16-28

UN

1.4375

1.4310

1.4143

1.4112

1.3950

1.3990

1.4051

1.4143

1.4184

1.4375

11/2-6

UNC

1.5000

1.4818

1.3917

1.3856

1.3015

1.3200

1.3396

1.3917

1.3996

1.5000

11/2-8

UN

1.5000

1.4850

1.4188

1.4133

1.3512

1.3650

1.3797

1.4188

1.4259

1.5000

11/2-12

UNF

1.5000

1.4886

1.4459

1.4411

1.4008

1.4100

1.4198

1.4459

1.4522

1.5000

11/2-16

UN

1.5000

1.4906

1.4594

1.4555

1.4256

1.4320

1.4409

1.4594

1.4645

1.5000

11/2-18

UNEF

1.5000

1.4913

1.4639

1.4602

1.4338

1.4400

1.4480

1.4639

1.4687

1.5000

11/2-20

UN

1.5000

1.4919

1.4675

1.4639

1.4405

1.4460

1.4536

1.4675

1.4721

1.5000

11/2-28

UN

1.5000

1.4935

1.4768

1.4737

1.4575

1.4610

1.4676

1.4768

1.4809

1.5000

19/16-6

UN

1.5625

1.5443

1.4542

1.4481

1.3640

1.3820

1.4021

1.4542

1.4622

1.5625

19/16-8

UN

1.5625

1.5475

1.4813

1.4758

1.4137

1.4270

1.4422

1.4813

1.4885

1.5625

19/16-12

UN

1.5625

1.5511

1.5084

1.5040

1.4633

1.4720

1.4823

1.5084

1.5142

1.5625

19/16-16

UN

1.5625

1.5531

1.5219

1.5180

1.4881

1.4950

1.5034

1.5219

1.5270

1.5625

19/16-18

UNEF

1.5625

1.5538

1.5264

1.5227

1.4963

1.5020

1.5105

1.5264

1.5313

1.5625

19/16-20

UN

1.5625

1.5544

1.5300

1.5264

1.5030

1.5080

1.5161

1.5300

1.5347

1.5625

15/8-6

UN

1.6250

1.6068

1.5167

1.5105

1.4265

1.4450

1.4646

1.5167

1.5247

1.6250

15/8-8

UN

1.6250

1.6100

1.5438

1.5382

1.4762

1.4900

1.5047

1.5438

1.5510

1.6250

15/8-12

UN

1.6250

1.6136

1.5709

1.5665

1.5258

1.5350

1.5448

1.5709

1.5767

1.6250

15/8-16

UN

1.6250

1.6156

1.5844

1.5805

1.5506

1.5570

1.5659

1.5844

1.5895

1.6250

15/8-18

UNEF

1.6250

1.6163

1.5889

1.5851

1.5588

1.5650

1.5730

1.5889

1.5938

1.6250

15/8-20

UN

1.6250

1.6169

1.5925

1.5889

1.5655

1.5710

1.5786

1.5925

1.5972

1.6250

111/16-6

UN

1.6875

1.6693

1.5792

1.5730

1.4890

1.5070

1.5271

1.5792

1.5873

1.6875

111/16-8

UN

1.6875

1.6725

1.6063

1.6007

1.5387

1.5520

1.5672

1.6063

1.6136

1.6875

111/16-12

UN

1.6875

1.6761

1.6334

1.6289

1.5883

1.5970

1.6073

1.6334

1.6392

1.6875

111/16-16

UN

1.6875

1.6781

1.6469

1.6429

1.6131

1.6200

1.6284

1.6469

1.6520

1.6875

111/16-18

UNEF

1.6875

1.6788

1.6514

1.6476

1.6213

1.6270

1.6355

1.6514

1.6563

1.6875

111/16-20

UN

1.6875

1.6794

1.6550

1.6514

1.6280

1.6330

1.6411

1.6550

1.6597

1.6875

13/4-5

UNC

1.7500

1.7295

1.6201

1.6134

1.5118

1.5330

1.5575

1.6201

1.6288

1.7500

13/4-6

UN

1.7500

1.7318

1.6417

1.6354

1.5515

1.5700

1.5896

1.6417

1.6498

1.7500

13/4-8

UN

1.7500

1.7350

1.6688

1.6631

1.6012

1.6150

1.6297

1.6688

1.6762

1.7500

13/4-12

UN

1.7500

1.7386

1.6959

1.6914

1.6508

1.6600

1.6698

1.6959

1.7017

1.7500

13/4-16

UN

1.7500

1.7406

1.7094

1.7054

1.6756

1.6820

1.6909

1.7094

1.7146

1.7500

13/4-20

UN

1.7500

1.7419

1.7175

1.7139

1.6905

1.6960

1.7036

1.7175

1.7222

1.7500

3级标准系列统一螺纹的极限尺寸(1 13/16~3 1/2)

3级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

3A外螺纹

3B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

113/16-6

UN

1.8125

1.7943

1.7042

1.6979

1.6140

1.6320

1.6521

1.7042

1.7124

1.8125

113/16-8

UN

1.8125

1.7975

1.7313

1.7256

1.6637

1.6770

1.6922

1.7313

1.7387

1.8125

113/16-12

UN

1.8125

1.8011

1.7584

1.7539

1.7133

1.7220

1.7323

1.7584

1.7642

1.8125

113/16-16

UN

1.8125

1.8031

1.7719

1.7679

1.7381

1.7450

1.7534

1.7719

1.7771

1.8125

113/16-20

UN

1.8125

1.8044

1.7800

1.7763

1.7530

1.7580

1.7661

1.7800

1.7847

1.8125

17/8-6

UN

1.8750

1.8568

1.7667

1.7604

1.6765

1.6950

1.7146

1.7667

1.7749

1.8750

17/8-8

UN

1.8750

1.8600

1.7938

1.7881

1.7262

1.7400

1.7547

1.7938

1.8013

1.8750

17/8-12

UN

1.8750

1.8636

1.8209

1.8164

1.7758

1.7850

1.7948

1.8209

1.8268

1.8750

17/8-16

UN

1.8750

1.8656

1.8344

1.8304

1.8006

1.8070

1.8159

1.8344

1.8396

1.8750

17/8-20

UN

1.8750

1.8669

1.8425

1.8388

1.8155

1.8210

1.8286

1.8425

1.8473

1.8750

115/16-6

UN

1.9375

1.9193

1.8292

1.8228

1.7390

1.7570

1.7771

1.8292

1.8375

1.9375

115/16-8

UN

1.9375

1.9225

1.8563

1.8505

1.7887

1.8020

1.8172

1.8563

1.8638

1.9375

115/16-12

UN

1.9375

1.9261

1.8834

1.8789

1.8383

1.8470

1.8573

1.8834

1.8893

1.9375

115/16-16

UN

1.9375

1.9281

1.8969

1.8929

1.8631

1.8700

1.8784

1.8969

1.9021

1.9375

115/16-20

UN

1.9375

1.9294

1.9050

1.9013

1.8780

1.8830

1.8911

1.9050

1.9098

1.9375

2-41/2

UNC

2.0000

1.9780

1.8557

1.8486

1.7354

1.7590

1.7861

1.8557

1.8650

2.0000

2-6

UN

2.0000

1.9818

1.8917

1.8853

1.8015

1.8200

1.8396

1.8917

1.9000

2.0000

2-8

UN

2.0000

1.9850

1.9188

1.9130

1.8512

1.8650

1.8797

1.9188

1.9264

2.0000

2-12

UN

2.0000

1.9886

1.9459

1.9414

1.9008

1.9100

1.9198

1.9459

1.9518

2.0000

2-16

UN

2.0000

1.9906

1.9594

1.9554

1.9256

1.9320

1.9409

1.9594

1.9646

2.0000

2-20

UN

2.0000

1.9919

1.9675

1.9638

1.9405

1.9460

1.9536

1.9675

1.9723

2.0000

21/8-6

UN

2.1250

2.1068

2.0167

2.0102

1.9265

1.9450

1.9646

2.0167

2.0251

2.1250

21/8-8

UN

2.1250

2.1100

2.0438

2.0379

1.9762

1.9900

2.0047

2.0438

2.0515

2.1250

21/8-12

UN

2.1250

2.1136

2.0709

2.0663

2.0258

2.0350

2.0448

2.0709

2.0768

2.1250

21/8-16

UN

2.1250

2.1156

2.0844

2.0803

2.0506

2.0570

2.0659

2.0844

2.0897

2.1250

21/8-20

UN

2.1250

2.1169

2.0925

2.0888

2.0655

2.0710

2.0786

2.0925

2.0973

2.1250

21/4-41/2

UNC

2.2500

2.2280

2.1057

2.0984

1.9854

2.0090

2.0361

2.1057

2.1152

2.2500

21/4-6

UN

2.2500

2.2318

2.1417

2.1351

2.0515

2.0700

2.0896

2.1417

2.1502

2.2500

21/4-8

UN

2.2500

2.2350

2.1688

2.1628

2.1012

2.1150

2.1297

2.1688

2.1766

2.2500

21/4-12

UN

2.2500

2.2386

2.1959

2.1913

2.1508

2.1600

2.1698

2.1959

2.2019

2.2500

21/4-16

UN

2.2500

2.2406

2.2094

2.2053

2.1756

2.1820

2.1909

2.2094

2.2147

2.2500

21/4-20

UN

2.2500

2.249

2.2175

2.2137

2.1905

2.1960

2.2036

2.2175

2.2224

2.2500

23/8-6

UN

2.3750

2.3568

2.2667

2.2601

2.1765

2.1950

2.2146

2.2667

2.2753

2.3750

23/8-8

UN

2.3750

2.3600

2.2938

2.2878

2.2262

2.2400

2.2547

2.2938

2.3017

2.3750

23/8-12

UN

2.3750

2.3636

2.3209

2.3163

2.2758

2.2850

2.2948

2.3209

2.3269

2.3750

23/8-16

UN

2.3750

2.3656

2.3344

2.3303

2.3006

2.3070

2.3159

2.3344

2.3398

2.3750

23/8-20

UN

2.3750

2.3669

2.3425

2.3387

2.315

2.3210

2.3286

2.3425

2.3474

2.3750

21/2-4

UNC

2.5000

2.4762

2.3376

2.3298

2.2023

2.2290

2.2594

2.3376

2.3477

2.5000

21/2-6

UN

2.5000

2.4818

2.3917

2.3850

2.3015

2.3200

2.3396

2.3917

2.4004

2.5000

21/2-8

UN

2.5000

2.4850

2.4188

2.4127

2.3512

2.3650

2.3797

2.4188

2.4268

2.5000

21/2-12

UN

2.5000

2.4886

2.4459

2.4413

2.4008

2.4100

2.4198

2.4459

2.4519

2.5000

21/2-16

UN

2.5000

2.4906

2.4594

2.4553

2.4256

2.4320

2.4409

2.4594

2.4648

2.5000

21/2-20

UN

2.5000

2.4919

2.4675

2.4637

2.4405

2.4460

2.4536

2.4675

2.4725

2.5000

25/8-6

UN

2.6250

2.6068

2.5167

2.5099

2.4265

2.4450

2.4646

2.5167

2.5255

2.6250

25/8-8

UN

2.6250

2.6100

2.5438

2.5376

2.4762

2.4900

2.5047

2.5438

2.5518

2.6250

25/8-12

UN

2.6250

2.6136

2.5709

2.5662

2.5258

2.5350

2.5448

2.5709

2.5770

2.6250

25/8-16

UN

2.6250

2.6156

2.5844

2.5802

2.5506

2.5570

2.5659

2.5844

2.5898

2.6250

25/8-20

UN

2.6250

2.6169

2.5925

2.5887

2.5655

2.5710

2.5786

2.5925

2.5975

2.6250

23/4-4

UNC

2.7500

2.7262

2.5876

2.5797

2.4523

2.4790

2.5094

2.5876

2.5979

2.7500

23/4-6

UN

2.7500

2.7318

2.6417

2.6349

2.5515

2.5700

2.5896

2.6417

2.6506

2.7500

23/4-8

UN

2.7500

2.7350

2.6688

2.6625

2.6012

2.6150

2.6297

2.6688

2.6769

2.7500

23/4-12

UN

2.7500

2.7386

2.6959

2.6912

2.6508

2.6600

2.6698

2.6959

2.7020

2.7500

23/4-16

UN

2.7500

2.7406

2.7094

2.7052

2.6756

2.6820

2.6909

2.7094

2.7148

2.7500

23/4-20

UN

2.7500

2.7419

2.7175

2.7136

2.6905

2.6960

2.7036

2.7175

2.7225

2.7500

27/8-6

UN

2.8750

2.8568

2.7667

2.7598

2.6765

2.6950

2.7146

2.7667

2.7757

2.8750

27/8-8

UN

2.8750

2.8600

2.7938

2.7875

2.7262

2.7400

2.7547

2.7938

2.8020

2.8750

27/8-12

UN

2.8750

2.8636

2.8209

2.8162

2.7758

2.7850

2.7948

2.8209

2.8270

2.8750

27/8-16

UN

2.8750

2.8656

2.8344

2.8302

2.8006

2.8070

2.8159

2.8344

2.8399

2.8750

27/8-20

UN

2.8750

2.8669

2.8425

2.8386

2.8155

2.8210

2.8286

2.8425

2.8475

2.8750

3-4

UNC

3.0000

2.9762

2.8376

2.9286

2.7023

2.7290

2.7594

2.8376

2.8480

3.0000

3-6

UN

3.0000

2.9818

2.8917

2.8447

2.8015

2.8200

2.8396

2.8917

2.9008

3.0000

3-8

UN

3.0000

2.9850

2.9188

2.9124

2.8512

2.8650

2.8797

2.9188

2.9271

3.0000

3-12

UN

3.0000

2.9886

2.9459

2.9412

2.9008

2.9100

2.9198

2.9459

2.9521

3.0000

3-16

UN

3.0000

2.9906

2.9594

2.9552

2.9256

2.9320

2.9409

2.9594

2.9649

3.0000

3-20

UN

3.0000

2.9919

2.9675

2.9636

2.9405

2.9460

2.9536

2.9675

2.9726

3.0000

31/8-6

UN

3.1250

3.1068

3.0167

3.0097

2.9265

2.9450

2.9646

3.0167

3.0259

3.1250

31/8-8

UN

3.1250

3.1100

3.0438

3.0374

2.9762

2.9900

3.0047

3.0438

3.0522

3.1250

31/8-12

UN

3.1250

3.1136

3.0709

3.0661

3.0258

3.0350

3.0448

3.0709

3.0771

3.1250

31/8-16

UN

3.1250

3.1156

3.0844

3.0801

3.0506

3.0570

3.0659

3.0844

3.0899

3.1250

31/4-4

UNC

3.2500

3.2262

3.0876

3.0794

2.9523

2.9790

3.0094

3.0876

3.0982

3.2500

31/4-6

UN

3.2500

3.2318

3.1417

3.1346

3.0515

3.0700

3.0896

3.1417

3.1509

3.2500

31/4-8

UN

3.2500

3.2350

3.1688

3.1623

3.1012

3.1150

3.1297

3.1688

3.1773

3.2500

31/4-12

UN

3.2500

3.2386

3.1959

3.1911

3.1508

3.1600

3.1698

3.1959

3.2021

3.2500

31/4-16

UN

3.2500

3.2406

3.2094

3.2051

3.1756

3.1820

3.1909

3.2094

3.2150

3.2500

33/8-6

UN

3.3750

3.3568

3.2667

3.2595

3.1765

3.1950

3.2146

3.2667

3.2760

3.3750

33/8-8

UN

3.3750

3.3600

3.2938

3.2872

3.2262

3.2400

3.2547

3.2938

3.3023

3.3750

33/8-12

UN

3.3750

3.3636

3.3209

3.3161

3.2758

3.2850

3.2948

3.3209

3.3272

3.3750

33/8-16

UN

3.3750

3.3656

3.3344

3.3301

3.3006

3.3070

3.3159

3.3344

3.3400

3.3750

31/2-4

UNC

3.5000

3.4762

3.3376

3.3293

3.2023

3.2290

3.2594

3.3376

3.3484

3.5000

31/2-6

UN

3.5000

3.4818

3.3917

3.3845

3.3015

3.3200

3.396

3.3917

3.4011

3.5000

31/2-8

UN

3.5000

3.4850

3.4188

3.4122

3.3512

3.3650

3.3797

3.4188

3.4274

3.5000

31/2-12

UN

3.5000

3.4886

3.4459

3.4411

3.4008

3.4100

3.4198

3.4459

3.4522

3.5000

31/2-16

UN

3.5000

3.4906

3.4594

3.4551

3.4256

3.4320

3.4409

3.4594

3.4650

3.5000

3级标准系列统一螺纹的极限尺寸(3 5/8~6)

3级标准系列统一螺纹的极限尺寸

公称直径

-牙数

系列

代号

3A外螺纹

3B 内螺纹

大径

d

中径

d2

UNR

小径d3

(参考)

小径

D1

中径

D2

大径

D

max

min

max

min

max

min

max

min

max

min

35/8-6

UN

3.6250

3.6068

3.5167

3.5094

3.4265

3.4450

3.4646

3.5167

3.5262

3.6250

35/8-8

UN

3.6250

3.6100

3.5438

3.5371

3.4762

3.4900

3.5047

3.5438

3.5525

3.6250

35/8-12

UN

3.6250

3.6136

3.5709

3.5661

3.5258

3.5350

3.5448

3.5709

3.5772

3.6250

35/8-16

UN

3.6250

3.6156

3.5844

3.5801

3.5506

3.5570

3.5659

3.5844

3.5900

3.6250

33/4-4

UNC

3.7500

3.7262

3.5876

3.5792

3.4523

3.4790

3.5094

3.5876

3.5985

3.7500

33/4-6

UN

3.7500

3.7318

3.6417

3.6344

3.5515

3.5700

3.5896

3.6417

3.6512

3.7500

33/4-8

UN

3.7500

3.7350

3.6688

3.6621

3.6012

3.6150

3.6297

3.6688

3.6776

3.7500

33/4-12

UN

3.7500

3.7386

3.6959

3.6910

3.6508

3.6600

3.8698

3.6959

3.7022

3.7500

33/4-16

UN

3.7500

3.7406

3.7094

3.7050

3.6756

3.6820

3.6909

3.7094

3.7151

3.7500

37/8-6

UN

3.8750

3.8568

3.7667

3.7593

3.6765

3.6950

3.7146

3.7667

3.7763

3.8750

37/8-8

UN

3.8750

3.8600

3.7938

3.7870

3.7262

3.7400

3.7547

3.7938

3.8026

3.8750

37/8-12

UN

3.8750

3.8636

3.8209

3.8160

3.7758

3.7850

3.7948

3.8209

3.8273

3.8750

37/8-16

UN

3.8750

3.8656

3.8344

3.8300

3.8006

3.8070

3.8159

3.8344

3.8401

3.8750

4-4

UNC

4.0000

3.9762

3.8376

3.8291

3.7023

3.7290

3.7594

3.8376

3.8487

4.0000

4-6

UN

4.0000

3.9818

3.8917

3.8843

3.8015

3.8200

3.8396

3.8917

3.9014

4.0000

4-8

UN

4.0000

3.9850

3.9188

3.9120

3.8512

3.8650

3.8797

3.9188

3.9277

4.0000

4-12

UN

4.0000

3.9886

3.9459

3.9410

3.9008

3.9100

3.9198

3.9459

3.9523

4.0000

4-16

UN

4.0000

3.9906

3.9594

3.9550

3.9256

3.9320

3.9409

3.9594

3.9651

4.0000

41/8-6

UN

4.1250

4.1068

4.0167

4.0092

3.9265

3.9450

3.9646

4.0167

4.0264

4.1250

41/8-8

UN

4.1250

4.1100

4.0438

4.0369

3.9762

3.9900

4.0047

4.0438

4.0528

4.1250

41/8-12

UN

4.1250

4.1136

4.0709

4.0060

4.0258

4.0350

4.0448

4.0709

4.0773

4.1250

41/8-16

UN

4.1250

4.1156

4.0844

4.0800

4.0506

4.0570

4.0659

4.0844

4.0901

4.1250

41/4-4

UN

4.2500

4.2262

4.0876

4.0790

3.9523

3.9790

4.0094

4.0876

4.0988

4.2500

41/4-6

UN

4.2500

4.2318

4.1417

4.1342

4.0515

4.0700

4.0896

4.1417

4.1515

4.2500

41/4-8

UN

4.2500

4.2350

4.1688

4.1618

4.1012

4.1150

4.1297

4.1688

4.1778

4.2500

41/4-12

UN

4.2500

4.2386

4.1959

4.1910

4.1508

4.1600

4.1698

4.1959

4.2023

4.2500

41/4-16

UN

4.2500

4.2406

4.2094

4.2050

4.1756

4.1820

4.1909

4.2094

4.2152

4.2500

43/8-6

UN

4.3750

4.3568

4.2667

4.2591

4.1765

4.1950

4.2146

4.2667

4.2766

4.3750

43/8-8

UN

4.3750

4.3600

4.2938

4.2868

4.2262

4.2400

4.2547

4.2938

4.3029

4.3750

43/8-12

UN

4.3750

4.3636

4.3209

4.3159

4.2758

4.2850

4.2948

4.3209

4.3273

4.3750

43/8-16

UN

4.3750

4.356

4.3344

4.3299

4.3006

4.3070

4.3159

4.3344

4.3402

4.3750

41/2-4

UN

4.5000

4.4762

4.3376

4.3289

4.2023

4.2290

4.2594

4.3376

4.3489

4.5000

41/2-6

UN

4.5000

4.4818

4.3917

4.3840

4.3015

4.3200

4.396

4.3917

4.4016

4.5000

41/2-8

UN

4.5000

4.4850

4.4188

4.4117

4.3512

4.3650

4.3797

4.4188

4.4280

4.5000

41/2-12

UN

4.5000

4.4886

4.4459

4.4409

4.4008

4.4100

4.4198

4.4459

4.4524

4.5000

41/2-16

UN

4.5000

4.4906

4.4594

4.4549

4.4256

4.4320

4.4409

4.4594

4.4652

4.5000

45/8-6

UN

4.6250

4.6068

4.5167

4.5090

4.4265

4.4450

4.4646

4.5167

4.5267

4.6250

45/8-8

UN

4.6250

4.6100

4.5438

4.5367

4.4762

4.4900

4.5047

4.5438

4.5530

4.6250

45/8-12

UN

4.6250

4.6136

4.5709

4.5659

4.5258

4.5350

4.5448

4.5709

4.5774

4.6250

45/8-16

UN

4.6250

4.6156

4.5844

4.5799

4.5506

4.5570

4.5659

4.5844

4.5902

4.6250

43/4-4

UN

4.7500

4.7262

4.5876

4.5788

4.4523

4.4790

4.5094

4.5876

4.5990

4.7500

43/4-6

UN

4.7500

4.7318

4.6417

4.6340

4.5515

4.5700

4.5896

4.6417

4.6518

4.7500

43/4-8

UN

4.7500

4.7350

4.6688

4.6616

4.6012

4.6150

4.6297

4.6688

4.6781

4.7500

43/4-12

UN

4.7500

4.7386

4.6959

4.6909

4.6508

4.6600

4.6698

4.6959

4.7024

4.7500

43/4-16

UN

4.7500

4.7406

4.7094

4.7049

4.6756

4.6820

4.6909

4.7094

4.7153

4.7500

47/8-6

UN

4.8750

4.8568

4.7667

4.7589

4.6765

4.6950

4.7146

4.7667

4.7768

4.8750

47/8-8

UN

4.8750

4.8600

4.7938

4.7866

4.7262

4.7400

4.7547

4.7938

4.8032

4.8750

47/8-12

UN

4.8750

4.8636

4.8209

4.8159

4.7758

4.7850

4.7948

4.8209

4.8274

4.8750

47/8-16

UN

4.8750

4.8656

4.8344

4.8299

4.8006

4.8070

4.8159

4.8344

4.8403

4.8750

5-4

UN

5.0000

4.9762

4.8376

4.8287

4.7023

4.7290

4.7594

4.8376

4.8492

5.0000

5-6

UN

5.0000

4.9818

4.8917

4.8839

4.8015

4.8200

4.8396

4.8917

4.9019

5.0000

5-8

UN

5.0000

4.9850

4.9188

4.9115

4.8512

4.8650

4.8797

4.9188

4.9282

5.0000

5-12

UN

5.0000

4.9886

4.9459

4.9409

4.9008

4.9100

4.9198

4.9459

4.9525

5.0000

5-16

UN

5.0000

4.9906

4.9594

4.9549

4.9256

4.9320

4.9409

4.9594

4.9653

5.0000

51/8-6

UN

5.1250

5.1068

5.0167

5.0088

4.9265

4.9450

4.9646

5.0167

5.0270

5.1250

51/8-8

UN

5.1250

5.1100

5.0438

5.0365

4.9762

4.9900

5.0047

5.0438

5.0533

5.1250

51/8-12

UN

5.1250

5.1136

5.0709

5.0658

5.0258

5.0350

5.0448

5.0709

5.0775

5.1250

51/8-16

UN

5.1250

5.1156

5.0844

5.0798

5.0506

5.0570

5.0659

5.0844

5.0903

5.1250

51/4-4

UN

5.2500

5.2262

5.0876

5.0786

4.9523

4.9790

5.0094

5.0876

5.0993

5.2500

51/4-6

UN

5.2500

5.2318

5.1417

5.1338

5.0515

5.0700

5.0896

5.1417

5.1520

5.2500

51/4-8

UN

5.2500

5.2350

5.1688

5.1615

5.1012

5.1150

5.1297

5.1688

5.1783

5.2500

51/4-12

UN

5.2500

5.2386

5.1959

5.1908

5.1508

5.1600

5.1698

5.1959

5.2025

5.2500

51/4-16

UN

5.2500

5.2406

5.2094

5.2048

5.1756

5.1820

5.1909

5.2094

5.2153

5.2500

53/8-6

UN

5.3750

5.3568

5.2668

5.2587

5.1765

5.1950

5.2146

5.2668

5.2771

5.3750

53/8-8

UN

5.3750

5.3600

5.2938

5.2864

5.2262

5.2400

5.2547

5.2938

5.3034

5.3750

53/8-12

UN

5.3750

5.3636

5.3209

5.3158

5.2758

5.2850

5.2948

5.3209

5.3275

5.3750

53/8-16

UN

5.3750

5.3656

5.3344

5.3298

5.3006

5.3070

5.3159

5.3344

5.3404

5.3750

51/2-4

UN

5.5000

5.4762

5.3376

5.3285

5.2023

5.2290

5.2594

5.3376

5.3494

5.5000

51/2-6

UN

5.5000

5.4818

5.3917

5.3837

5.3015

5.3200

5.3396

5.3917

5.4021

5.5000

51/2-8

UN

5.5000

5.4850

5.4188

5.4114

5.3512

5.3650

5.3797

5.4188

5.4285

5.5000

51/2-12

UN

5.5000

5.4886

5.4459

5.4408

5.4008

5.4100

5.4198

5.4459

5.4525

5.5000

51/2-16

UN

5.5000

5.4906

5.4594

5.4548

5.4256

5.4320

5.4409

5.4594

5.4654

5.5000

55/8-6

UN

5.6250

5.6068

5.5167

5.5086

5.4265

5.4450

5.4646

5.5167

5.5272

5.6250

55/8-8

UN

5.6250

5.6100

5.5438

5.5363

5.4762

5.4900

5.5047

5.5438

5.5535

5.6250

55/8-12

UN

5.6250

5.6136

5.5709

5.5658

5.5258

5.5350

5.5448

5.5709

5.5776

5.6250

55/8-16

UN

5.6250

5.6156

5.5844

5.5798

5.5506

5.5570

5.5659

5.5844

5.5904

5.6250

53/4-4

UN

5.7500

5.7262

5.5876

5.5784

5.4523

5.4790

5.5094

5.5876

5.5995

5.7500

53/4-6

UN

5.7500

5.7318

5.6417

5.6336

5.5515

5.5700

5.5896

5.6417

5.6523

5.7500

53/4-8

UN

5.7500

5.7350

5.6688

5.6613

5.6012

5.6150

5.6297

5.6688

5.6786

5.7500

53/4-12

UN

5.7500

5.7386

5.6959

5.6908

5.6508

5.6600

5.6698

5.6959

5.7026

5.7500

53/4-16

UN

5.7500

5.7406

5.7094

5.7048

5.6756

5.6820

5.6909

5.7094

5.7154

5.7500

57/8-6

UN

5.8750

5.8568

5.7667

5.7585

5.6765

5.6950

5.7146

5.7667

5.7773

5.8750

57/8-8

UN

5.8750

5.8600

5.7938

5.7862

5.7262

5.7400

5.7547

5.7938

5.8036

5.8750

57/8-12

UN

5.8750

5.8636

5.8209

5.8157

5.7758

5.7850

5.7948

5.8209

5.8276

5.8750

57/8-16

UN

5.8750

5.8656

5.8344

5.8298

5.8006

5.8070

5.8159

5.8344

5.8404

5.8750

6-4

UN

6.0000

5.9762

5.8376

5.8283

5.7023

5.7290

5.7594

5.8376

5.8496

6.0000

6-6

UN

6.0000

5.9818

5.8917

5.8835

5.8015

5.8200

5.8396

5.8917

5.9024

6.0000

6-8

UN

6.0000

5.9850

5.9188

5.9112

5.8512

5.8650

5.8797

5.9188

5.9287

6.0000

6-12

UN

6.0000

5.9886

5.9459

5.9407

5.9008

5.9100

5.9198

5.9459

5.9526

6.0000

6-16

UN

6.0000

5.9906

5.9594

5.9547

5.9256

5.9320

5.9409

5.9594

5.9655

6.0000