TECHNICAL THREADING CHART - KOMET of...

Thread Series Pitch or in / Rev

Minor Dia Min (2B / 3B)

Minor Dia Max (2B)

Minor Dia Max (3B)

Pitch Dia Min (2B / 3B)

Pitch Dia Max (2B)

Pitch Dia Max (3B)

70% ThreadEngagement




#0-80 (.060") UNF 0.012500 0.0465 0.0514 0.0514 0.0519 0.0542 0.0536 0.0486 0.0478 0.0545 0.0541

#1-64 (.073") UNC 0.015625 0.0561 0.0622 0.0622 0.0629 0.0655 0.0648 0.0588 0.0578 0.0661 0.0656

#1-72 (.073") UNF 0.013889 0.0580 0.0634 0.0634 0.0640 0.0665 0.0659 0.0604 0.0595 0.0669 0.0664

#2-56 (.086") UNC 0.017857 0.0667 0.0737 0.0737 0.0744 0.0772 0.0765 0.0698 0.0686 0.0781 0.0775

#2-64 (.086") UNF 0.015625 0.0691 0.0752 0.0752 0.0759 0.0786 0.0779 0.0718 0.0708 0.0791 0.0786

#3-48 (.099") UNC 0.020833 0.0764 0.0845 0.0845 0.0855 0.0885 0.0877 0.0801 0.0787 0.0898 0.0891

#3-56 (.099") UNF 0.017857 0.0797 0.0865 0.0865 0.0874 0.0902 0.0895 0.0828 0.0816 0.0911 0.0905

#4-40 (.112") UNC 0.025000 0.0849 0.0939 0.0939 0.0958 0.0991 0.0982 0.0893 0.0876 0.1010 0.1001

#4-48 (.112") UNF 0.020833 0.0894 0.0968 0.0968 0.0985 0.1016 0.1008 0.0931 0.0917 0.1028 0.1021

#5-40 (.125") UNC 0.025000 0.0979 0.1062 0.1062 0.1088 0.1121 0.1113 0.1023 0.1006 0.1140 0.1131

#5-44 (.125") UNF 0.022727 0.1004 0.1079 0.1079 0.1102 0.1134 0.1126 0.1043 0.1029 0.1150 0.1142

#6-32 (.138") UNC 0.031250 0.1040 0.1140 0.1139 0.1177 0.1214 0.1204 0.1096 0.1076 0.1242 0.1231

#6-40 (.138") UNF 0.025000 0.1110 0.1190 0.1186 0.1218 0.1252 0.1243 0.1153 0.1136 0.1270 0.1261

#8-32 (.164") UNC 0.031250 0.1300 0.1390 0.1388 0.1437 0.1475 0.1465 0.1356 0.1336 0.1502 0.1491

#8-36 (.164") UNF 0.027778 0.1340 0.1420 0.1416 0.1460 0.1496 0.1487 0.1387 0.1369 0.1517 0.1508

#10-24 (.190") UNC 0.041667 0.1450 0.1550 0.1555 0.1629 0.1672 0.1661 0.1521 0.1494 0.1716 0.1702

#10-32 (.190") UNF 0.031250 0.1560 0.1640 0.1641 0.1697 0.1736 0.1726 0.1616 0.1596 0.1762 0.1751

#12-24 (.216") UNC 0.041667 0.1710 0.1810 0.1807 0.1889 0.1933 0.1922 0.1781 0.1754 0.1976 0.1962

#12-28 (.216") UNF 0.035714 0.1770 0.1860 0.1857 0.1928 0.1970 0.1959 0.1835 0.1812 0.2002 0.1990

#12-32 (.216") UNEF 0.031250 0.1820 0.1900 0.1895 0.1957 0.1998 0.1988 0.1876 0.1856 0.2022 0.2011

1/4-20 UNC 0.050000 0.1960 0.2070 0.2067 0.2175 0.2224 0.2211 0.2045 0.2013 0.2279 0.2262

1/4-28 UNF 0.035714 0.2110 0.2200 0.2190 0.2268 0.2311 0.2300 0.2175 0.2152 0.2342 0.2330

1/4-32 UNEF 0.031250 0.2160 0.2240 0.2229 0.2297 0.2339 0.2328 0.2216 0.2196 0.2362 0.2351

5/16-18 UNC 0.055556 0.2520 0.2650 0.2630 0.2764 0.2817 0.2803 0.2620 0.2584 0.2879 0.2861

5/16-24 UNF 0.041667 0.2670 0.2770 0.2754 0.2854 0.2902 0.2890 0.2746 0.2719 0.2941 0.2927

5/16-32 UNEF 0.031250 0.2790 0.2860 0.2846 0.2922 0.2965 0.2954 0.2841 0.2821 0.2987 0.2976

3/8-16 UNC 0.062500 0.3070 0.3210 0.3182 0.3344 0.3401 0.3387 0.3182 0.3141 0.3474 0.3453

3/8-24 UNF 0.041667 0.3300 0.3400 0.3372 0.3479 0.3528 0.3516 0.3371 0.3344 0.3566 0.3552

3/8-32 UNEF 0.031250 0.3410 0.3490 0.3469 0.3547 0.3591 0.3580 0.3466 0.3446 0.3612 0.3601

7/16-14 UNC 0.071429 0.3600 0.3760 0.3717 0.3911 0.3972 0.3957 0.3726 0.3679 0.4059 0.4035

7/16-20 UNF 0.050000 0.3830 0.3950 0.3916 0.4050 0.4104 0.4091 0.3920 0.3888 0.4154 0.4137

7/16-28 UNEF 0.035714 0.3990 0.4070 0.4051 0.4143 0.4190 0.4178 0.4050 0.4027 0.4217 0.4205

1/2-13 UNC 0.076923 0.4170 0.4340 0.4284 0.4500 0.4565 0.4548 0.4301 0.4251 0.4660 0.4634

1/2-20 UNF 0.050000 0.4460 0.4570 0.4537 0.4675 0.4731 0.4717 0.4545 0.4513 0.4779 0.4762

1/2-28 UNEF 0.035714 0.4610 0.4700 0.4676 0.4768 0.4816 0.4804 0.4675 0.4652 0.4842 0.4830

9/16-12 UNC 0.083333 0.4720 0.4900 0.4843 0.5084 0.5152 0.5135 0.4867 0.4813 0.5257 0.5228

9/16-18 UNF 0.055556 0.5020 0.5150 0.5106 0.5264 0.5323 0.5308 0.5120 0.5084 0.5379 0.5361

9/16-24 UNEF 0.041667 0.5170 0.5270 0.5244 0.5354 0.5405 0.5393 0.5246 0.5219 0.5441 0.5427

5/8-11 UNC 0.090909 0.5270 0.5460 0.5391 0.5660 0.5732 0.5714 0.5423 0.5364 0.5848 0.5817

5/8-18 UNF 0.055556 0.5650 0.5780 0.5730 0.5889 0.5949 0.5934 0.5745 0.5709 0.6004 0.5986

5/8-24 UNEF 0.041667 0.5800 0.5900 0.5869 0.5979 0.6031 0.6018 0.5871 0.5844 0.6066 0.6052

3/4-10 UNC 0.100000 0.6420 0.6630 0.6545 0.6850 0.6927 0.6907 0.6591 0.6526 0.7058 0.7024

3/4-16 UNF 0.062500 0.6820 0.6960 0.6909 0.7094 0.7159 0.7143 0.6932 0.6891 0.7224 0.7203

3/4-20 UNEF 0.050000 0.6960 0.7070 0.7036 0.7175 0.7232 0.7218 0.7045 0.7013 0.7279 0.7262

7/8-9 UNC 0.111111 0.7550 0.7780 0.7681 0.8028 0.8110 0.8089 0.7740 0.7668 0.8259 0.8221

7/8-14 UNF 0.071429 0.7980 0.8130 0.8067 0.8286 0.8356 0.8339 0.8101 0.8054 0.8434 0.8410

7/8-20 UNEF 0.050000 0.8210 0.8320 0.8286 0.8425 0.8483 0.8469 0.8295 0.8263 0.8529 0.8512

1-8 UNC 0.125000 0.8650 0.8900 0.8797 0.9188 0.9276 0.9254 0.8863 0.8782 0.9448 0.9405

1-12 UNF 0.083333 0.9100 0.9280 0.9198 0.9459 0.9535 0.9516 0.9242 0.9188 0.9632 0.9603

1-14 UNS 0.071429 0.9230 0.9380 0.9315 0.9536 0.9605 0.9588 0.9351 0.9304 0.9684 0.9660

1-20 UNEF 0.050000 0.9460 0.9570 0.9536 0.9675 0.9734 0.9719 0.9545 0.9513 0.9779 0.9762

1.1/16-8 UN 0.125000 0.9270 0.9520 0.9422 0.9813 0.9902 0.9880 0.9488 0.9407 1.0073 1.0030

1.1/16-12 UN 0.083333 0.9720 0.9900 0.9823 1.0084 1.0158 1.0139 0.9867 0.9813 1.0257 1.0228

1.1/16-18 UNEF 0.055556 1.0020 1.0150 1.0105 1.0264 1.0326 1.0311 1.0120 1.0084 1.0379 1.0361

1.1/8-7 UNC 0.142857 0.9700 0.9980 0.9875 1.0322 1.0416 1.0393 0.9951 0.9858 1.0619 1.0570

1.1/8-8 UN 0.125000 0.9900 1.0150 1.0047 1.0438 1.0528 1.0505 1.0113 1.0032 1.0698 1.0655

1.1/8-12 UNF 0.083333 1.0350 1.0530 1.0448 1.0709 1.0787 1.0768 1.0492 1.0438 1.0882 1.0853

1.1/8-18 UNEF 0.055556 1.0650 1.0780 1.0730 1.0889 1.0951 1.0936 1.0745 1.0709 1.1004 1.0986

1.3/16-8 UN 0.125000 1.0520 1.0770 1.0672 1.1063 1.1154 1.1131 1.0738 1.0657 1.1323 1.1280

1.3/16-12 UN 0.083333 1.0970 1.1150 1.1073 1.1334 1.1409 1.1390 1.1117 1.1063 1.1507 1.1478

1.3/16-16 UN 0.062500 1.1200 1.1340 1.1284 1.1469 1.1535 1.1518 1.1307 1.1266 1.1599 1.1578

1.3/16-18 UNEF 0.055556 1.1270 1.1400 1.1355 1.1514 1.1577 1.1561 1.1370 1.1334 1.1629 1.1611

1.1/4-7 UNC 0.142857 1.0950 1.1230 1.1125 1.1572 1.1668 1.1644 1.1201 1.1108 1.1869 1.1820

1.1/4-8 UN 0.125000 1.1150 1.1400 1.1297 1.1688 1.1780 1.1757 1.1363 1.1282 1.1948 1.1905

1.1/4-12 UNF 0.083333 1.1600 1.1780 1.1698 1.1959 1.2039 1.2019 1.1742 1.1688 1.2132 1.2103

1.1/4-18 UNEF 0.055556 1.1900 1.2030 1.1980 1.2139 1.2202 1.2186 1.1995 1.1959 1.2254 1.2236

1.5/16-8 UN 0.125000 1.1770 1.2020 1.1922 1.2313 1.2405 1.2382 1.1988 1.1907 1.2573 1.2530

1.5/16-12 UN 0.083333 1.2220 1.2400 1.2323 1.2584 1.2659 1.2641 1.2367 1.2313 1.2757 1.2728

1.5/16-18 UNEF 0.055556 1.2520 1.2650 1.2605 1.2764 1.2828 1.2812 1.2620 1.2584 1.2879 1.2861

1.3/8-6 UNC 0.166667 1.1950 1.2250 1.2146 1.2667 1.2771 1.2745 1.2235 1.2126 1.3013 1.2957

1.3/8-8 UN 0.125000 1.2400 1.2650 1.2547 1.2938 1.3031 1.3008 1.2613 1.2532 1.3198 1.3155

1.3/8-12 UNF 0.083333 1.2850 1.3030 1.2948 1.3209 1.3291 1.3270 1.2992 1.2938 1.3382 1.3353

1.3/8-18 UNEF 0.055556 1.3150 1.3280 1.3230 1.3389 1.3453 1.3437 1.3245 1.3209 1.3504 1.3486

1.7/16-8 UN 0.125000 1.3020 1.3270 1.3172 1.3563 1.3657 1.3634 1.3238 1.3157 1.3823 1.3780

1.7/16-18 UNEF 0.055556 1.3770 1.3900 1.3855 1.4014 1.4078 1.4062 1.3870 1.3834 1.4129 1.4111

1.1/2-6 UNC 0.166667 1.3200 1.3500 1.3396 1.3917 1.4022 1.3996 1.3485 1.3376 1.4263 1.4207

1.1/2-8 UN 0.125000 1.3650 1.3900 1.3797 1.4188 1.4283 1.4259 1.3863 1.3782 1.4448 1.4405

1.1/2-12 UNF 0.083333 1.4100 1.4280 1.4198 1.4459 1.4542 1.4522 1.4242 1.4188 1.4632 1.4603

1.1/2-18 UNEF 0.055556 1.4400 1.4530 1.4480 1.4639 1.4704 1.4687 1.4495 1.4459 1.4754 1.4736

1.5/8-8 UN 0.125000 1.4900 1.5150 1.5047 1.5438 1.5535 1.5510 1.5113 1.5032 1.5698 1.5655

1.5/8-12 UN 0.083333 1.5350 1.5530 1.5448 1.5709 1.5786 1.5767 1.5492 1.5438 1.5882 1.5853

1.3/4-5 UNC 0.200000 1.5330 1.5670 1.5575 1.6201 1.6317 1.6288 *1.5681 1.5552 1.6616 1.6548

1.3/4-8 UN 0.125000 1.6150 1.6400 1.6297 1.6688 1.6786 1.6762 1.6363 1.6282 1.6948 1.6905

1.7/8-8 UN 0.125000 1.7400 1.7650 1.7547 1.7938 1.8038 1.8013 1.7613 1.7532 1.8198 1.8155

1.7/8-12 UN 0.083333 1.7850 1.8030 1.7948 1.8209 1.8287 1.8268 1.7992 1.7938 1.8382 1.8353

2-4.5 UNC 0.222222 1.7590 1.7950 1.7861 1.8557 1.8681 1.8650 *1.7979 1.7835 1.9018 1.8942

2-8 UN 0.125000 1.8650 1.8900 1.8797 1.9188 1.9289 1.9264 1.8863 1.8782 1.9448 1.9405

2.1/4-8 UN 0.125000 2.1150 2.1400 2.1297 2.1688 2.1792 2.1766 2.1363 2.1282 2.1948 2.1905

2.1/2-4 UNC 0.250000 2.2290 2.2670 2.2594 2.3376 2.3511 2.3477 *2.2727 2.2564 2.3895 2.3810

2.1/2-8 UN 0.125000 2.3650 2.3900 2.3797 2.4188 2.4294 2.4268 2.3863 2.3782 2.4448 2.4405

2.1/2-12 UN 0.083333 2.4100 2.4280 2.4198 2.4459 2.4540 2.4519 2.4242 2.4188 2.4632 2.4603

2.3/4-8 UN 0.125000 2.6150 2.6400 2.6297 2.6688 2.6796 2.6769 2.6363 2.6282 2.6948 2.6905

3-8 UN 0.125000 2.8650 2.8900 2.8797 2.9188 2.9299 2.9271 2.8863 2.8782 2.9448 2.9405

3.5-8 UN 0.125000 3.3650 3.3900 3.3797 3.4188 3.4303 3.4274 3.3863 3.3782 3.4448 3.4405

4-8 UN 0.125000 3.8650 3.8900 3.8797 3.9188 3.9307 3.9277 3.8863 3.8782 3.9448 3.9405

4.1/2-8 UN 0.125000 4.3650 4.3900 4.3797 4.4188 4.4310 4.4280 4.3863 4.3782 4.4448 4.4405

5-8 UN 0.125000 4.8650 4.8900 4.8797 4.9188 4.9314 4.9282 4.8863 4.8782 4.9448 4.9405

Minor Diameter Pitch Diameter Cut Thread Roll Form ThreadPre-Tap Bore Size Pre-Tap Bore Size

Roll Form ThreadThread Series Pitch or

mm / RevMinor Dia Min (6H)

Minor Dia Max (6H)

Pitch Dia Min (6H)

Pitch Dia Max (6H)

70% Thread Engagement




M2 M 0.40 1.567 1.679 1.740 1.830 1.636 1.610 1.823 1.810

M2 X .25 MF 0.25 **1.729 **1.785 **1.838 **1.896 1.773 1.756 1.890 1.881

M2.2 M 0.45 1.713 1.838 1.908 2.003 1.791 1.762 2.001 1.986

M2.2 X .25 MF 0.25 **1.929 **1.985 **2.038 **2.097 1.973 1.956 2.090 2.081

M2.5 M 0.45 2.013 2.138 2.208 2.303 2.091 2.062 2.301 2.286

M2.5 X .35 MF 0.35 2.121 2.221 2.273 2.358 2.182 2.159 2.345 2.333

M3 M 0.50 2.459 2.599 2.675 2.775 2.545 2.513 2.779 2.762

M3 X .35 MF 0.35 2.621 2.721 2.773 2.863 2.682 2.659 2.845 2.833

M3.5 M 0.60 2.850 3.010 3.110 3.222 2.954 2.915 3.235 3.214

M3.5 X .35 MF 0.35 3.121 3.221 3.273 3.363 3.182 3.159 3.345 3.333

M4 M 0.70 3.242 3.422 3.545 3.663 3.363 3.318 3.691 3.667

M4 X .5 MF 0.50 3.459 3.599 3.675 3.775 3.545 3.513 3.779 3.762

M4.5 M 0.75 3.688 3.878 4.013 4.131 3.818 3.769 4.169 4.143

M5 M 0.80 4.134 4.334 4.480 4.605 4.273 4.221 4.646 4.619

M5 X .5 MF 0.50 4.459 4.599 4.675 4.775 4.545 4.513 4.779 4.762

M6 M 1.00 4.917 5.153 5.350 5.500 5.091 5.026 5.558 5.524

M6 X .5 MF 0.50 5.459 5.599 5.675 5.783 5.545 5.513 5.779 5.762

M6 X .75 MF 0.75 5.188 5.378 5.513 5.645 5.318 5.269 5.669 5.643

M7 M 1.00 5.917 6.153 6.350 6.500 6.091 6.026 6.558 6.524

M8 M 1.25 6.647 6.912 7.188 7.348 6.863 6.782 7.448 7.405

M8 X .75 MF 0.75 7.188 7.378 7.513 7.645 7.318 7.269 7.669 7.643

M8 X 1 MF 1.00 6.917 7.153 7.350 7.500 7.091 7.026 7.558 7.524

M9 M 1.25 7.647 7.912 8.188 8.348 7.863 7.782 8.448 8.405

M10 M 1.50 8.376 8.676 9.026 9.206 8.636 8.539 9.337 9.286

M10 X .75 MF 0.75 9.188 9.378 9.513 9.645 9.318 9.269 9.669 9.643

M10 X 1 MF 1.00 8.917 9.153 9.350 9.500 9.091 9.026 9.558 9.524

M10 X 1.25 MF 1.25 8.647 8.912 9.188 9.348 8.863 8.782 9.448 9.405

M11 M 1.50 9.376 9.676 10.026 10.206 9.636 9.539 10.337 10.286

M12 M 1.75 10.106 10.441 10.863 11.063 10.409 10.295 11.227 11.167

M12 X .75 MF 0.75 11.188 11.378 11.513 11.649 11.318 11.269 11.669 11.643

M12 X 1 MF 1.00 10.917 11.153 11.350 11.510 11.091 11.026 11.558 11.524

M12 X 1.25 MF 1.25 10.647 10.912 11.188 11.368 10.863 10.782 11.448 11.405

M12 X 1.5 MF 1.50 10.376 10.676 11.026 11.216 10.636 10.539 11.337 11.286

M14 M 2.00 11.835 12.210 12.701 12.913 12.181 12.052 13.116 13.048

M14 X 1 MF 1.00 12.917 13.153 13.350 13.510 13.091 13.026 13.558 13.524

M14 X 1.25 MF 1.25 12.647 12.912 13.188 13.368 12.863 12.782 13.448 13.405

M14 X 1.5 MF 1.50 12.376 12.676 13.026 13.216 12.636 12.539 13.337 13.286

M15 x 1 MF 1.00 13.917 14.153 14.350 14.510 14.091 14.026 14.558 14.524

M16 M 2.00 13.835 14.210 14.701 14.913 14.181 14.052 15.116 15.048

M16 X 1 MF 1.00 14.917 15.153 15.350 15.510 15.091 15.026 15.558 15.524

M16 X 1.5 MF 1.50 14.376 14.676 15.026 15.216 14.636 14.539 15.337 15.286

M18 M 2.50 15.294 15.744 16.376 16.600 15.727 15.564 16.895 16.810

M18 X 1 MF 1.00 16.917 17.153 17.350 17.510 17.091 17.026 17.558 17.524

M18 X 1.5 MF 1.50 16.376 16.676 17.026 17.216 16.636 16.539 17.337 17.286

M18 X 2 MF 2.00 15.835 16.210 16.701 16.913 16.181 16.052 17.116 17.048

M20 M 2.50 17.294 17.744 18.376 18.600 17.727 17.564 18.895 18.810

M20 X 1 MF 1.00 18.917 19.153 19.350 19.510 19.091 19.026 19.558 19.524

M20 X 1.5 MF 1.50 18.376 18.676 19.026 19.216 18.636 18.539 19.337 19.286

M20 X 2 MF 2.00 17.835 18.210 18.701 18.913 18.181 18.052 19.116 19.048

M22 M 2.50 19.294 19.744 20.376 20.600 19.727 19.564 20.895 20.810

M22 X 1 MF 1.00 20.917 21.153 21.350 21.510 21.091 21.026 21.558 21.524

M22 X 1.5 MF 1.50 20.376 20.676 21.026 21.216 20.636 20.539 21.337 21.286

M22 X 2 MF 2.00 19.835 20.210 20.701 20.913 20.181 20.052 21.116 21.048

M24 M 3.00 20.752 21.252 22.051 22.316 *21.272 21.077 22.674 22.572

M24 X 1 MF 1.00 22.917 23.153 23.350 23.520 23.091 23.026 23.558 23.524

M24 X 1.5 MF 1.50 22.376 22.676 23.026 23.226 22.636 22.539 23.337 23.286

M24 X 2 MF 2.00 21.835 22.210 22.701 22.925 22.181 22.052 23.116 23.048

M26 X 1 MF 1.00 24.917 25.153 25.350 25.520 25.091 25.026 25.558 25.524

M26 X 1.5 MF 1.50 24.376 24.676 25.026 25.226 24.636 24.539 25.337 25.286

M27 M 3.00 23.752 24.252 25.051 25.316 *24.272 24.077 25.674 25.572

M27 X 1.5 MF 1.50 25.376 25.676 26.026 26.226 25.636 25.539 26.337 26.286

M27 X 2 MF 2.00 24.835 25.210 25.701 25.925 25.181 25.052 26.116 26.048

M28 X 1.5 MF 1.50 26.376 26.676 27.026 27.226 26.636 26.539 27.337 27.286

M28 X 2 MF 2.00 25.835 26.210 26.701 26.925 26.181 26.052 27.116 27.048

M30 M 3.50 26.211 26.771 27.727 28.007 *26.818 26.590 28.453 28.334

M30 X 1.5 MF 1.50 28.376 28.676 29.026 29.226 28.636 28.539 29.337 29.286

M30 X 2 MF 2.00 27.835 28.210 28.701 28.925 28.181 28.052 29.116 29.048

M30 X 3 MF 3.00 26.752 27.252 28.051 28.316 *27.272 27.077 28.674 28.572

M33 M 3.50 29.211 29.771 30.727 31.007 *29.817 29.590 31.453 31.334

M33 X 1.5 MF 1.50 31.376 31.676 32.026 32.226 31.636 31.539 32.337 32.286

M33 X 2 MF 2.00 30.835 31.210 31.701 31.925 31.181 31.052 32.116 32.048

M33 X 3 MF 3.00 29.752 30.252 31.051 31.316 *30.272 30.077 31.674 31.572

M36 M 4.00 31.670 32.270 33.402 33.702 *32.363 32.103 34.232 34.096

M36 X 1.5 MF 1.50 34.376 34.676 35.026 35.226 34.636 34.539 35.337 35.286

M36 X 2 MF 2.00 33.835 34.210 34.701 34.925 34.181 34.052 35.116 35.048

M36 X 3 MF 3.00 32.752 33.252 34.051 34.316 *33.272 33.077 34.674 34.572

M39 M 4.00 34.670 35.270 36.402 36.702 *35.363 35.103 37.232 37.096

M39 X 2 MF 2.00 36.835 37.210 37.701 37.925 37.181 37.052 38.116 38.048

M39 X 3 MF 3.00 35.752 36.252 37.051 37.316 *36.272 36.077 37.674 37.572

M42 M 4.50 37.129 37.799 39.077 39.392 *37.908 37.616 40.011 39.858

M42 X 3 MF 3.00 38.752 39.252 40.051 40.316 *39.272 39.077 40.674 40.572

M45 M 4.50 40.129 40.799 42.077 42.392 *40.908 40.616 43.011 42.858

M45 X 3 MF 3.00 41.752 42.252 43.051 43.316 *42.272 42.077 43.674 43.572

M48 M 5.00 42.587 43.297 44.752 45.087 *43.454 43.129 45.790 45.620

M48 X 3 MF 3.00 44.752 45.252 46.051 46.331 *45.272 45.077 46.674 46.572

M52 M 5.00 46.587 47.297 48.752 49.087 *47.454 47.129 49.790 49.620

M52 X 4 MF 4.00 47.670 48.270 49.402 49.717 *48.363 48.103 50.232 50.096

M56 M 5.50 50.046 50.796 52.428 52.783 *50.999 50.642 53.569 53.382

M56 X 2 MF 2.00 53.835 54.210 54.701 54.937 54.181 54.052 55.116 55.048

M56 X 3 MF 3.00 52.752 53.252 54.051 54.331 *53.272 53.077 54.674 54.572

M60 M 5.50 54.046 54.796 56.428 56.783 *54.999 54.642 57.569 57.382

M60 X 4 MF 4.00 55.670 56.270 57.402 57.717 *56.363 56.103 58.232 58.096

M64 M 6.00 57.505 58.305 60.103 60.478 *58.544 58.155 61.348 61.144

M64 X 3 MF 3.00 60.752 61.252 62.051 62.331 *61.272 61.077 62.674 62.572

M64 X 4 MF 4.00 59.670 60.270 61.402 61.717 *60.363 60.103 62.232 62.096

M68 M 6.00 61.505 62.305 64.103 64.478 *62.544 62.155 65.348 65.144

M68 X 4 MF 4.00 63.670 64.270 65.402 65.717 *64.363 64.103 66.232 66.096

Minor Diameter Pitch Diameter Cut Thread

Thread Series Pitch or in/Rev

Minor Dia Min (3B)

Minor Dia Max (3B)

Pitch Dia Min (3B)

Pitch Dia Max (3B)



Thread Pitch or mm/Rev

Minor Dia Min (4H)

Minor Dia Max (4H)

Pitch Dia Min (5H)

Pitch Dia Max (5H)



#4-40 (.112") UNJC 0.025000 0.0877 0.0942 0.0958 0.0982 0.0909 0.0893 MJ1.6 X .35 0.35 1.259 1.359 *1.373 *1.426 1.304 1.282

#4-48 (.112") UNJF 0.020833 0.0917 0.0971 0.0985 0.1008 0.0944 0.0931 MJ2 X .4 0.40 1.610 1.722 *1.740 *1.796 1.662 1.636

#6-32 (.138") UNJC 0.031250 0.1076 0.1157 0.1177 0.1205 0.1116 0.1096 MJ2.5 X .45 0.45 2.062 2.187 *2.208 *2.268 2.120 2.091

#6-40 (.138") UNJF 0.025000 0.1137 0.1202 0.1218 0.1243 0.1169 0.1153 MJ3 X .5 0.50 2.513 2.653 *2.675 *2.738 2.578 2.545

#8-32 (.164") UNJC 0.031250 0.1336 0.1417 0.1437 0.1465 0.1376 0.1356 MJ3.5 X .6 0.60 2.915 3.075 *3.110 *3.181 2.993 2.954

#8-36 (.164") UNJF 0.027778 0.1370 0.1442 0.1460 0.1487 0.1405 0.1387 MJ4 X .7 0.70 3.318 3.498 *3.545 *3.620 3.409 3.363

#10-24 (.190") UNJC 0.041667 0.1494 0.1600 0.1629 0.1661 0.1548 0.1521 MJ5 X .8 0.80 4.221 4.421 *4.480 *4.560 4.325 4.273

#10-32 (.190") UNJF 0.031250 0.1596 0.1675 0.1697 0.1726 0.1636 0.1616 MJ6 X 1 1.00 5.026 5.216 5.350 5.445 5.156 5.091

1/4-20 UNJC 0.050000 0.2013 0.2121 0.2175 0.2211 0.2078 0.2045 MJ7 X 1 1.00 6.026 6.216 6.350 6.445 6.156 6.091

1/4-28 UNJF 0.035714 0.2152 0.2229 0.2268 0.2300 0.2198 0.2175 MJ8 X 1 1.00 7.026 7.216 7.350 7.445 7.156 7.091

5/16-18 UNJC 0.055556 0.2584 0.2690 0.2764 0.2803 0.2656 0.2620 MJ8 X 1.25 1.25 6.782 6.994 7.188 7.288 6.945 6.863

5/16-24 UNJF 0.041667 0.2719 0.2799 0.2854 0.2890 0.2773 0.2746 MJ10 X 1.25 1.25 8.782 8.994 9.188 9.288 8.945 8.863

3/8-16 UNJC 0.062500 0.3141 0.3250 0.3344 0.3387 0.3222 0.3182 MJ10 X 1.5 1.50 8.539 8.775 9.026 9.138 8.733 8.636

3/8-24 UNJF 0.041667 0.3344 0.3417 0.3479 0.3516 0.3398 0.3371 MJ12 X 1.25 1.25 10.782 10.994 11.188 11.300 10.945 10.863

1/2-13 UNJC 0.076923 0.4251 0.4368 0.4500 0.4548 0.4351 0.4301 MJ12 X 1.75 1.75 10.295 10.560 10.863 10.988 10.522 10.409

1/2-20 UNJF 0.050000 0.4513 0.4591 0.4675 0.4717 0.4578 0.4545 MJ14 X 1.5 1.50 12.539 12.775 13.026 13.144 12.733 12.636

5/8-11 UNJC 0.090909 0.5365 0.5474 0.5660 0.5714 *0.5482 0.5423 MJ16 X 1.5 1.50 14.539 14.775 15.026 15.144 14.733 14.636

5/8-18 UNJF 0.055556 0.5709 0.5789 0.5889 0.5934 0.5781 0.5745 MJ18 X 1.5 1.50 16.539 16.775 17.026 17.144 16.733 16.636

3/4-10 UNJC 0.100000 0.6526 0.6646 0.6850 0.6907 *0.6656 0.6591 MJ20 X 1.5 1.50 18.539 18.775 19.026 19.144 18.733 18.636

3/4-16 UNJF 0.062500 0.6891 0.6976 0.7094 0.7143 0.6972 0.6932 MJ22 X 1.5 1.50 20.539 20.775 21.026 21.144 20.733 20.636

7/8-9 UNJC 0.111111 0.7668 0.7801 0.8028 0.8089 *0.7812 0.7740 MJ24 X 2 2.00 22.051 22.351 22.701 22.841 22.311 22.181

7/8-14 UNJF 0.071429 0.8054 0.8151 0.8286 0.8339 0.8147 0.8101 MJ27 X 2 2.00 25.051 25.351 25.701 25.841 25.311 25.181

1-8 UNJC 0.125000 0.8783 0.8933 0.9188 0.9254 *0.8945 0.8863 MJ30 X 2 2.00 28.051 28.351 28.701 28.841 28.311 28.181

1-12 UNJF 0.083333 0.9189 0.9289 0.9459 0.9516 *0.9296 0.9242 MJ33 X 2 2.00 31.051 31.351 31.701 31.841 31.311 31.181

Minor Diameter Minor Diameter

*May not be within 3B tolerance *Denotes 6H pitch tolerance

Pitch Diameter Pitch DiameterCut Thread Cut ThreadPre-Tap Bore Size Pre-Tap Bore Size

*Based on commonly available drill diameters

Nominal Thread

Series Pitch or in/Rev

Major Dia Max

Minor Dia Min

Minor Dia Max

Pitch Dia Min 2B/3B

Pitch Dia Max 2B

Pitch Dia Max 3B

Aluminum Steel Nominal Thread

Series Pitch or mm/Rev

Major Dia Max

Minor Dia Min

Minor Dia Max

Pitch Dia Min 4H/5H

Pitch Dia Max 4H

Pitch Dia Max 5H

Aluminum Steel

#1-64 (.073") UNC 0.015625 0.0958 0.0764 0.0823 0.0832 0.0850 0.0843 0.0785 0.0810 M2 M 0.40 2.581 2.087 2.170 2.260 2.295 2.310 2.100 2.100

#2-56 (.086") UNC 0.017857 0.1117 0.0899 0.0961 0.0976 0.0996 0.0989 0.0938 0.0960 M2.2 M 0.45 2.845 2.297 2.397 2.492 2.532 2.547 2.300 2.350

#2-64 (.086") UNF 0.015625 0.1088 0.0894 0.0947 0.0962 0.0981 0.0974 0.0925 0.0925 M2.5 M 0.45 3.145 2.597 2.697 2.792 2.832 2.847 2.550 2.650

#3-48 (.099") UNC 0.020833 0.1289 0.1036 0.1104 0.1126 0.1148 0.1140 0.1065 0.1094 M3 M 0.50 3.716 3.108 3.220 3.325 3.367 3.384 3.150 3.200

#3-56 (.099") UNF 0.017857 0.1247 0.1029 0.1086 0.1106 0.1126 0.1119 0.1040 0.1065 M3.5 M 0.60 4.354 3.630 3.755 3.890 3.940 3.959 3.700 3.700

#4-40 (.112") UNC 0.025000 0.1473 0.1175 0.1252 0.1283 0.1308 0.1299 0.1200 0.1200 M4 M 0.70 5.007 4.152 4.292 4.455 4.509 4.529 4.200 4.250

#4-48 (.112") UNF 0.020833 0.1419 0.1166 0.1229 0.1256 0.1279 0.1271 0.1181 0.1200 M5 M 0.80 6.145 5.174 5.334 5.520 5.577 5.597 5.200 5.300

#5-40 (.125") UNC 0.025000 0.1603 0.1305 0.1373 0.1413 0.1438 0.1430 0.1339 0.1360 M6 M 1.00 7.422 6.217 6.407 6.650 6.719 6.742 6.250 6.300

#6-32 (.138") UNC 0.031250 0.1817 0.1448 0.1527 0.1583 0.1611 0.1601 0.1470 0.1495 M7 M 1.00 8.422 7.217 7.407 7.650 7.719 7.742 7.250 7.300

#6-40 (.138") UNF 0.025000 0.1733 0.1435 0.1503 0.1543 0.1569 0.1560 0.1470 0.1495 M8 M 1.25 9.787 8.271 8.483 8.812 8.886 8.911 8.300 8.400

#8-32 (.164") UNC 0.031250 0.2077 0.1708 0.1781 0.1843 0.1872 0.1862 0.1730 0.1770 M8 X 1 MF 1.00 9.422 8.217 8.407 8.650 8.719 8.742 8.250 8.300

#8-36 (.164") UNF 0.027778 0.2032 0.1701 0.1771 0.1821 0.1849 0.1840 0.1730 0.1770 M10 M 1.50 12.131 10.324 10.560 10.974 11.061 11.089 10.500 10.500

#10-24 (.190") UNC 0.041667 0.2475 0.1990 0.2080 0.2170 0.2203 0.2192 0.2031 0.2055 M10 X 1 MF 1.00 11.422 10.217 10.407 10.650 10.719 10.742 10.250 10.250

#10-32 (.190") UNF 0.031250 0.2337 0.1968 0.2041 0.2103 0.2133 0.2123 0.2010 0.2031 M10 X 1.25 MF 1.25 11.787 10.271 10.483 10.812 10.886 10.911 10.250 10.250

#12-24 (.216") UNC 0.041667 0.2735 0.2250 0.2340 0.2430 0.2464 0.2453 0.2280 0.2280 M12 M 1.75 14.478 12.379 12.644 13.137 13.236 13.271 12.500 12.500

1/4-20 UNC 0.050000 0.3187 0.2608 0.2704 0.2825 0.2864 0.2851 0.2660 0.2660 M12 X 1.25 MF 1.25 13.787 12.271 12.483 12.812 12.898 12.926 12.250 12.250

1/4-28 UNF 0.035714 0.2995 0.2577 0.2646 0.2732 0.2765 0.2754 0.2610 0.2638 M12 X 1.5 MF 1.50 14.131 12.324 12.560 12.974 13.067 13.099 12.250 12.500

5/16-18 UNC 0.055556 0.3884 0.3245 0.3342 0.3486 0.3529 0.3515 0.3320 0.3320 M14 M 2.00 16.822 14.433 14.733 15.299 15.406 15.444 14.500 14.500

5/16-24 UNF 0.041667 0.3700 0.3215 0.3288 0.3395 0.3433 0.3421 0.3281 0.3281 M14 X 1.5 MF 1.50 16.131 14.324 14.560 14.974 15.067 15.099 14.250 14.500

3/8-16 UNC 0.062500 0.4602 0.3885 0.3987 0.4156 0.4203 0.4189 0.3970 0.3970 M16 M 2.00 18.822 16.433 16.733 17.299 17.406 17.444 16.500 16.500

3/8-24 UNF 0.041667 0.4325 0.3840 0.3910 0.4020 0.4059 0.4047 0.3906 0.3906 M16 X 1.5 MF 1.50 18.131 16.324 16.560 16.974 17.067 17.099 16.250 16.500

7/16-14 UNC 0.071429 0.5343 0.4530 0.4639 0.4839 0.4890 0.4875 0.4531 0.4531 M18 M 2.50 21.513 18.541 18.896 19.624 19.738 19.778 18.750 18.750

7/16-20 UNF 0.050000 0.5062 0.4483 0.4561 0.4700 0.4744 0.4731 0.4531 0.4531 M18 X 1.5 MF 1.50 20.131 18.324 18.560 18.974 19.067 19.099 18.250 18.500

1/2-13 UNC 0.076923 0.6042 0.5166 0.5273 0.5499 0.5554 0.5537 0.5156 0.5312 M18 X 2 MF 2.00 20.822 18.433 18.733 19.299 19.406 19.444 18.500 18.500

1/2-20 UNF 0.050000 0.5687 0.5108 0.5186 0.5325 0.5371 0.5357 0.5156 0.5156 M20 M 2.50 23.513 20.541 20.896 21.624 21.738 21.778 20.750 20.750

9/16-12 UNC 0.083333 0.6751 0.5806 0.5918 0.6167 0.6225 0.6208 0.5781 0.5938 M20 X 1.5 MF 1.50 22.131 20.324 20.560 20.974 21.067 21.099 20.250 20.500

9/16-18 UNF 0.055556 0.6384 0.5745 0.5826 0.5986 0.6035 0.6020 0.5781 0.5781 M20 X 2 MF 2.00 22.822 20.433 20.733 21.299 21.406 21.444 20.500 20.500

5/8-11 UNC 0.090909 0.7477 0.6447 0.6564 0.6841 0.6903 0.6885 0.6562 0.6562 M22 M 2.50 25.513 22.541 22.896 23.624 23.738 23.778 22.750 22.750

5/8-18 UNF 0.055556 0.7009 0.6370 0.6451 0.6611 0.6661 0.6646 0.6406 0.6406 M22 X 1.5 MF 1.50 24.131 22.324 22.560 22.974 23.067 23.099 22.250 22.500

3/4-10 UNC 0.100000 0.8850 0.7716 0.7838 0.8149 0.8216 0.8196 0.7812 0.7812 M22 X 2 MF 2.00 24.822 22.433 22.733 23.299 23.406 23.444 22.500 22.500

3/4-16 UNF 0.062500 0.8352 0.7635 0.7720 0.7906 0.7961 0.7945 0.7656 0.7656 M24 M 3.00 28.238 24.649 25.049 25.948 26.093 26.135 24.750 24.750

7/8-9 UNC 0.111111 1.0247 0.8990 0.9119 0.9471 0.9543 0.9522 0.9062 0.9062 M24 X 2 MF 2.00 26.822 24.433 24.733 25.299 25.414 25.454 24.500 24.500

7/8-14 UNF 0.071429 0.9718 0.8905 0.8994 0.9214 0.9274 0.9257 0.8906 0.8906 M27 M 3.00 31.238 27.649 28.049 28.948 29.093 29.135 27.750 27.750

1-8 UNC 0.125000 1.1681 1.0271 1.0421 1.0812 1.0890 1.0868 1.0312 1.0312 M27 X 2 MF 2.00 29.822 27.433 27.733 28.299 28.414 28.454 27.500 27.500

1-12 UNF 0.083333 1.1126 1.0181 1.0281 1.0542 1.0608 1.0589 1.0156 1.0312 M30 M 3.50 34.925 30.757 31.207 32.273 32.428 32.472 31.000 31.000

1-14 UNS 0.071429 1.0968 1.0155 1.0243 1.0464 1.0527 1.0508 1.0156 1.0312 M30 X 2 MF 2.00 32.822 30.433 30.733 31.299 31.414 31.454 30.500 30.500

1.1/8-7 UNC 0.142857 1.3171 1.1559 1.1730 1.2178 1.2262 1.2239 1.1719 1.1719 M33 M 3.50 37.925 33.757 34.207 35.273 35.428 35.472 34.000 34.000

1.1/8-12 UNF 0.083333 1.2376 1.1431 1.1531 1.1792 1.1860 1.1841 1.1406 1.1562 M33 X 2 MF 2.00 35.822 33.433 33.733 34.299 34.414 34.454 33.500 33.500

1.1/4-7 UNC 0.142857 1.4421 1.2809 1.2980 1.3428 1.3514 1.3490 1.2969 1.2969 M36 M 4.00 41.615 36.866 37.341 38.598 38.763 38.809 37.000 37.000

1.1/4-12 UNF 0.083333 1.3626 1.2681 1.2781 1.3042 1.3112 1.3092 1.2656 1.2812 M36 X 2 MF 2.00 38.822 36.433 36.733 37.299 37.414 37.454 36.500 36.500

1.3/8-6 UNC 0.166667 1.5982 1.4110 1.4310 1.4832 1.4926 1.4900 1.4219 1.4219 M36 X 3 MF 3.00 40.238 36.649 37.049 37.948 38.093 38.135 37.000 37.000

1.3/8-12 UNF 0.083333 1.4876 1.3931 1.4031 1.4292 1.4364 1.4343 1.3906 1.4062 M39 M 4.00 44.615 39.866 40.341 41.598 41.763 41.809 40.000 40.000

1.1/2-6 UNC 0.166667 1.7232 1.5360 1.5560 1.6082 1.6177 1.6151 1.5469 1.5469 M39 X 2 MF 2.00 41.822 39.433 36.733 40.299 40.414 40.454 39.500 39.500

1.1/2-12 UNF 0.083333 1.6126 1.5181 1.5281 1.5542 1.5615 1.5595 1.5156 1.5312 M39 X 3 MF 3.00 43.238 39.649 40.049 40.948 41.093 41.135 40.000 40.000

Minor Diameter Minor DiameterPitch Diameter Pitch DiameterCut Thread Cut ThreadDrill Size* Drill Size*

TECHNICAL THREADING CHART

* With large pitches 70% thread engagement may not be within 6H limits** Small pitches use 5H tolerance

* With large pitches 70% thread engagement may not be within 2B limits

Threading Tech Line

Expert support for your technical threading questions.

844-4-THREAD

Use the JEL TPT online or mobile app to select the best thread milling tool for your application, calculate machine cycle time, and download the related CNC program. Go to kometgroup.com or install on your iOS or Android mobile device.

Apple Android

UN

UNJ MJ

STI (EG) UN STI (EG) M

Pitch Diameter at E1

Hand Tight L1 Gage Length*

Hole Depth for SAE Short Tap


Hand Tight L1 Gage Length*


K0 NPT / ANPT

K0 NPTF / PTF SAE-Short

Thread Pitch or Feed per Revolution

OD of Pipe (External Thread)

Pitch Dia Min 2B

Pitch Dia Max 2B

Minor Dia Min

Minor Dia Max

Pitch Dia Min

Pitch Dia Max

Minimum Minor Dia

Pitch Dia Min

Pitch Dia Max

Minimum Minor Dia

Pitch Dia Min

Pitch Dia Max

Minimum Minor Dia

Pitch Dia Min

Pitch Dia Max

Minimum Minor Dia

0.27887 0.1230 0.4564 0.27118 0.1600 0.28118 0.2415 0.2443 1/16 - 27 0.037037 0.3125 – – – – – – – 0.2768 0.2803 0.2482 – – – 0.2791 0.2826 0.2505

0.37129 0.1244 0.4578 0.36351 0.1615 0.37360 0.3338 0.3367 1/8 - 27 0.037037 0.4050 0.358 0.364 0.3736 0.3783 0.3701 0.3771 0.340 0.3692 0.3727 0.3406 0.3863 0.3898 0.362 0.3715 0.3750 0.3429

0.48815 0.1722 0.6722 0.47739 0.2278 0.49163 0.4329 0.4362 1/4 - 18 0.055556 0.5400 0.468 0.481 0.4916 0.4974 0.4864 0.4968 0.442 0.4852 0.4904 0.4422 0.5073 0.5125 0.470 0.4886 0.4938 0.4457

0.62354 0.1844 0.6844 0.61201 0.2400 0.62701 0.5675 0.5708 3/8 - 18 0.055556 0.6750 0.603 0.612 0.6270 0.6329 0.6218 0.6322 0.577 0.6205 0.6257 0.5776 0.6444 0.6496 0.607 0.6240 0.6292 0.5811

0.77397 0.2486 0.8915 0.75843 0.3200 0.77843 0.7014 0.7034 1/2 - 14 0.071429 0.8400 0.747 0.759 0.7784 0.7851 0.7717 0.7851 0.715 0.7700 0.7767 0.7133 0.8008 0.8075 0.753 0.7745 0.7812 0.7180

0.98441 0.2676 0.9105 0.96768 0.3390 0.98887 0.9106 0.9127 3/4 - 14 0.071429 1.0500 0.958 0.970 0.9889 0.9958 0.9822 0.9956 0.925 0.9805 0.9872 0.9238 1.0112 1.0179 0.964 0.9850 0.9917 0.9283

1.23320 0.3130 1.0956 1.21363 0.4000 1.23863 1.1441 1.1470 1 - 11.5 0.086957 1.3150 1.201 1.211 1.2386 1.2462 1.2305 1.2468 1.161 1.2284 1.2365 1.1600 1.2658 1.2739 1.208 1.2338 1.2420 1.1655

1.57795 0.3330 1.1156 1.55713 0.4200 1.58338 1.4876 1.4905 1.1/4 - 11.5 0.086957 1.6600 1.546 1.555 1.5834 1.5912 1.5752 1.5915 1.506 – – – 1.6106 1.6187 1.553 – – –

1.81691 0.3330 1.1156 1.79609 0.4200 1.82234 1.7266 1.7295 1.1/2 - 11.5 0.086957 1.9000 1.785 1.794 1.8223 1.8302 1.8142 1.8305 1.745 – – – 1.8495 1.8576 1.792 – – –

2.29084 0.3490 1.1316 2.26902 0.4360 2.29627 2.1995 2.2024 2 - 11.5 0.086957 2.3750 2.259 2.268 2.2963 2.3044 2.2881 2.3044 2.219 – – – 2.3234 2.3315 2.265 – – –

2.75435 0.5570 1.6820 2.71953 0.6820 2.76216 2.6195 2.6234 2.1/2 - 8 0.125000 2.8750 2.708 2.727 2.7622 2.7720 2.7504 2.7739 2.650 – – – 2.8012 2.8129 2.718 – – –

3.38069 0.6410 1.7660 3.34063 0.7660 3.38850 3.2406 3.2445 3 - 8 0.125000 3.5000 3.334 3.353 3.3885 3.3984 3.3768 3.4002 3.277 – – – 3.4276 3.4393 3.344 – – –

– – – 3.83750 0.8210 3.88881 3.7374 – 3.1/2 - 8 0.125000 4.0000 3.835 3.848 3.8888 3.8988 3.8771 3.9005 3.777 – – – 3.9279 3.9396 3.845 – – –

– – – 4.33438 0.8440 4.38713 4.2343 – 4 - 8 0.125000 4.5000 4.333 4.346 4.3871 4.3971 4.3754 4.3988 4.275 – – – 4.4262 4.4379 4.343 – – –

– – – 5.39073 0.9370 5.44929 5.2907 – 5 - 8 0.125000 5.5630 5.395 5.408 5.4493 5.4598 – – – – – – 5.4884 5.5001 5.405 – – –

– – – 6.44609 0.9580 6.50597 6.3460 – 6 - 8 0.125000 6.6250 6.452 6.464 6.5060 6.5165 – – – – – – 6.5450 6.5567 6.462 – – –

PTF-SAE Short NPT / ANPT / NPTF Pre-Tap Bore Size NPS / NPSM NPSC NPSF NPSL NPSIInternal Taper Pipe Thread Internal Straight Pipe ThreadPipe Threads

M

*For NPT/NPTF threads 11.5 TPI or finer, the effective internal thread depth is equal to minimum 4 pitches more than L1 and for 8 TPI it is equal to minimum 3 pitches more.

1TPI

Feed per Revolution = P Feed per Minute = RPM × P

Unit Conversions

1” = 25.4mm 1mm = .03937”

SFM = SMM = SFM × .3048 SMM.3048

RPM and Surface Speed Calculations

RPM = RPM =(SFM ×3.82)

Ø inch

RPM × (Ø inch)

3.82

RPM × (Ø mm)

318.31

(SMM ×318.31)

Ø mm

SFM = SMM =

l4 l4l4l4

Material Drill thread milling Helical drill thread milling Thread milling Thread milling

BGF DBGF MKG MGF

Steel 3.0 × D 2.0 × D 2.0 × D

Stainless steel 2.0 × D 2.0 × D

Grey cast iron 2.5 × D 3.0 × D 2.0 × D 2.5 × D

Nodular grey cast iron 2.0 × D 3.0 × D 2.0 × D 2.0 × D

Titanium alloys 2.0 × D 2.0 × D

Nickel alloys 1.5 x D / 2.0 × D 1.5 x D / 2.0 × D

Copper alloys 2.5 × D 3.0 × D 2.0 × D 2.5 × D

Aluminium 2.5 × D / 3.0 × D 3.0 × D 2.0 × D 2.5 × D / 3.0 × D

Plastics 2.5 × D 3.0 × D 2.0 × D 2.5 × D

Poss

ible

thre

ad m

illin

g en

gage

men

ts

Definitions

SFM = Surface Feet per Minute SMM = Surface Meters per MinutefZ = Feed per Tooth Z = Number of Teeth

Feedrate Calculations

Feed per Revolution = fZ × Z Feed per Minute = RPM × fZ × Z

Tapping Feedrate Calculations

Tap Drill Calculations

60 Degree UN and M Threads Only P=Thread Pitch=

Drill Ø Cut Taps = (Nominal Major Ø) – 0.01299 × P × (% of Thread)

Drill Ø Roll Form Taps = (Nominal Major Ø) – 0.0068 × P × (% of Thread)

FE

1.5 - 2 <1.5

Blind hole threads with very short thread run-out

A B C D

6 - 8 3.5 - 5.5 2 - 3 3.5 - 5

Through hole threadsBlind hole threads with short thread run-out (bottoming tap)

Blind hole threads with long thread run-out (plug tap)

Blind and through hole threads in short chipping materials

Short through hole threads

Tap

cham

fer f

orm

Type of flute

Application

No. of threads l4

Straight flute Straight flute spiral point Straight or helical flutes

Blind hole threads with very short thread run-out

3.5 - 5 1.5 - 2 1.5

ED F

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The information on this chart is based on current thread standards at time of printing and is subject to change without notice. Values are listed in the same unit as the thread type. KOMET® GROUP shall have no liability or responsibility from any use of this information. For additional threading information, download our JEL TPT app or call our Threading Tech Line at 1-844-4-THREAD.$9.99 USD

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