Threads and Threading - Sportpilot.info
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Machinery's H<strong>and</strong>book 27th Edition<br />
Table 3. (Continued) St<strong>and</strong>ard Series <strong>and</strong> Selected Combinations — Unified Screw <strong>Threads</strong><br />
Nominal Size,<br />
<strong>Threads</strong> per Inch,<br />
<strong>and</strong> Series<br />
Designation<br />
3<br />
⁄8 –24 UNF 1A 0.0011 0.3739 0.3631 — 0.3468 0.3411 0.3243 1B 0.330 0.340 0.3479 0.3553 0.3750<br />
a<br />
Externalb Internalb Allow-<br />
Major Diameter Pitch Diameter<br />
UNR Minor<br />
Dia.,<br />
Class ance<br />
c Max<br />
Minor Diameter Pitch Diameter<br />
Major<br />
Diameter<br />
Max (Ref.) Class<br />
d Min Mine Maxd Min Min Max Min Max Min<br />
2A 0.0011 0.3739 0.3667 — 0.3468 0.3430 0.3243 2B 0.330 0.340 0.3479 0.3528 0.3750<br />
3 ⁄8 –24 UNF 3A 0.0000 0.3750 0.3678 — 0.3479 0.3450 0.3254 3B 0.3300 0.3372 0.3479 0.3516 0.3750<br />
3 ⁄8 –27 UNS 2A 0.0011 0.3739 0.3672 — 0.3498 0.3462 0.3298 2B 0.335 0.344 0.3509 0.3556 0.3750<br />
3 ⁄8–28 UN 2A 0.0011 0.3739 0.3674 — 0.3507 0.3471 0.3313 2B 0.336 0.345 0.3518 0.3564 0.3750<br />
3A 0.0000 0.3750 0.3685 — 0.3518 0.3491 0.3324 3B 0.3360 0.3426 0.3518 0.3553 0.3750<br />
3 ⁄8 –32 UNEF 2A 0.0010 0.3740 0.3680 — 0.3537 0.3503 0.3368 2B 0.341 0.349 0.3547 0.3591 0.3750<br />
3A 0.0000 0.3750 0.3690 — 0.3547 0.3522 0.3378 3B 0.3410 0.3469 0.3547 0.3580 0.3750<br />
3 ⁄8 –36 UNS 2A 0.0010 0.3740 0.3685 — 0.3560 0.3528 0.3409 2B 0.345 0.352 0.3570 0.3612 0.3750<br />
3 ⁄8 –40 UNS 2A 0.0009 0.3741 0.3690 — 0.3579 0.3548 0.3443 2B 0.348 0.354 0.3588 0.3628 0.3750<br />
0.390–27 UNS 2A 0.0011 0.3889 0.3822 — 0.3648 0.3612 0.3448 2B 0.350 0.359 0.3659 0.3706 0.3900<br />
7 ⁄16 –14 UNC 1A 0.0014 0.4361 0.4206 — 0.3897 0.3826 0.3511 1B 0.360 0.376 0.3911 0.4003 0.4375<br />
2A 0.0014 0.4361 0.4258 0.4206 0.3897 0.3850 0.3511 2B 0.360 0.376 0.3911 0.3972 0.4375<br />
3A 0.0000 0.4375 0.4272 — 0.3911 0.3876 0.3525 3B 0.3600 0.3717 0.3911 0.3957 0.4375<br />
7<br />
⁄16 –16 UN 2A 0.0014 0.4361 0.4267 — 0.3955 0.3909 0.3616 2B 0.370 0.384 0.3969 0.4028 0.4375<br />
3A 0.0000 0.4375 0.4281 — 0.3969 0.3935 0.3630 3B 0.3700 0.3800 0.3969 0.4014 0.4375<br />
7<br />
⁄16 –18 UNS 2A 0.0013 0.4362 0.4275 — 0.4001 0.3958 0.3701 2B 0.377 0.390 0.4014 0.4070 0.4375<br />
7 ⁄16–20 UNF 1A 0.0013 0.4362 0.4240 — 0.4037 0.3975 0.3767 1B 0.383 0.395 0.4050 0.4131 0.4375<br />
2A 0.0013 0.4362 0.4281 — 0.4037 0.3995 0.3767 2B 0.383 0.395 0.4050 0.4104 0.4375<br />
3A 0.0000 0.4375 0.4294 — 0.4050 0.4019 0.3780 3B 0.3830 0.3916 0.4050 0.4091 0.4375<br />
7<br />
⁄16 –24 UNS 2A 0.0011 0.4364 0.4292 — 0.4093 0.4055 0.3868 2B 0.392 0.402 0.4104 0.4153 0.4375<br />
7<br />
⁄16 –27 UNS 2A 0.0011 0.4364 0.4297 — 0.4123 0.4087 0.3923 2B 0.397 0.406 0.4134 0.4181 0.4375<br />
7<br />
⁄16 –28 UNEF 2A 0.0011 0.4364 0.4299 — 0.4132 0.4096 0.3938 2B 0.399 0.407 0.4143 0.4189 0.4375<br />
3A 0.0000 0.4375 0.4310 — 0.4143 0.4116 0.3949 3B 0.3990 0.4051 0.4143 0.4178 0.4375<br />
7<br />
⁄16 –32 UN 2A 0.0010 0.4365 0.4305 — 0.4162 0.4128 0.3993 2B 0.404 0.411 0.4172 0.4216 0.4375<br />
3A 0.0000 0.4375 0.4315 — 0.4172 0.4147 0.4003 3B 0.4040 0.4094 0.4172 0.4205 0.4375<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
UNIFIED SCREW THREADS 1739