Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
Threads and Threading - Sportpilot.info
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Nominal Size,<br />
<strong>Threads</strong> per Inch,<br />
<strong>and</strong> Series<br />
Designation a<br />
Class<br />
Table 3. (Continued) St<strong>and</strong>ard Series <strong>and</strong> Selected Combinations — Unified Screw <strong>Threads</strong><br />
Allowance<br />
Machinery's H<strong>and</strong>book 27th Edition<br />
Externalb Internalb Major Diameter Pitch Diameter<br />
UNR Minor<br />
Dia., 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 />
17 ⁄ 16 –28 UN 2A 0.0013 1.4362 1.4297 — 1.4130 1.4088 1.3936 2B 1.399 1.407 1.4143 1.4198 1.4375<br />
3A 0.0000 1.4375 1.4310 — 1.4143 1.4112 1.3949 3B 1.3990 1.4051 1.4143 1.4184 1.4375<br />
11 ⁄ 2 –6 1A 0.0024 1.4976 1.4703 — 1.3893 1.3772 1.2992 1B 1.320 1.350 1.3917 1.4075 1.5000<br />
2A 0.0024 1.4976 1.4794 1.4703 1.3893 1.3812 1.2992 2B 1.320 1.350 1.3917 1.4022 1.5000<br />
3A 0.0000 1.5000 1.4818 — 1.3917 1.3856 1.3016 3B 1.3200 1.3396 1.3917 1.3996 1.5000<br />
11 ⁄ 2 –8 UN 2A 0.0022 1.4978 1.4828 1.4753 1.4166 1.4093 1.3490 2B 1.365 1.390 1.4188 1.4283 1.5000<br />
3A 0.0000 1.5000 1.4850 — 1.4188 1.4133 1.3512 3B 1.3650 1.3797 1.4188 1.4259 1.5000<br />
11 ⁄ 2–10 UNS 2A 0.0019 1.4981 1.4852 — 1.4331 1.4267 1.3791 2B 1.392 1.413 1.4350 1.4433 1.5000<br />
11 ⁄ 2 –12 UNF 1A 0.0019 1.4981 1.4809 — 1.4440 1.4344 1.3989 1B 1.410 1.428 1.4459 1.4584 1.5000<br />
2A 0.0019 1.4981 1.4867 — 1.4440 1.4376 1.3989 2B 1.410 1.428 1.4459 1.4542 1.5000<br />
3A 0.0000 1.5000 1.4886 — 1.4459 1.4411 1.4008 3B 1.4100 1.4198 1.4459 1.4522 1.5000<br />
11 ⁄ 2 –14 UNS 2A 0.0017 1.4983 1.4880 — 1.4519 1.4464 1.4133 2B 1.423 1.438 1.4536 1.4608 1.5000<br />
11 ⁄ 2 –16 UN 2A 0.0016 1.4984 1.4890 — 1.4578 1.4526 1.4239 2B 1.432 1.446 1.4594 1.4662 1.5000<br />
3A 0.0000 1.5000 1.4906 — 1.4594 1.4555 1.4255 3B 1.4320 1.4408 1.4594 1.4645 1.5000<br />
11 ⁄ 2 –18 UNEF 2A 0.0015 1.4985 1.4898 — 1.4624 1.4574 1.4324 2B 1.440 1.452 1.4639 1.4704 1.5000<br />
3A 0.0000 1.5000 1.4913 — 1.4639 1.4602 1.4339 3B 1.4400 1.4480 1.4639 1.4687 1.5000<br />
11 ⁄ 2 –20 UN 2A 0.0014 1.4986 1.4905 — 1.4661 1.4613 1.4391 2B 1.446 1.457 1.4675 1.4737 1.5000<br />
3A 0.0000 1.5000 1.4919 — 1.4675 1.4639 1.4405 3B 1.4460 1.4537 1.4675 1.4721 1.5000<br />
11 ⁄ 2 –24 UNS 2A 0.0013 1.4987 1.4915 — 1.4716 1.4672 1.4491 2B 1.455 1.465 1.4729 1.4787 1.5000<br />
11 ⁄ 2–28 UN 2A 0.0013 1.4987 1.4922 — 1.4755 1.4713 1.4561 2B 1.461 1.470 1.4768 1.4823 1.5000<br />
3A 0.0000 1.5000 1.4935 — 1.4768 1.4737 1.4574 3B 1.4610 1.4676 1.4768 1.4809 1.5000<br />
19 ⁄ 16 –6 UN 2A 0.0024 1.5601 1.5419 — 1.4518 1.4436 1.3617 2B 1.382 1.413 1.4542 1.4648 1.5625<br />
3A 0.0000 1.5625 1.5443 — 1.4542 1.4481 1.3641 3B 1.3820 1.4021 1.4542 1.4622 1.5625<br />
19 ⁄ 16 –8 UN 2A 0.0022 1.5603 1.5453 — 1.4791 1.4717 1.4115 2B 1.427 1.452 1.4813 1.4909 1.5625<br />
3A 0.0000 1.5625 1.5475 — 1.4813 1.4758 1.4137 3B 1.4270 1.4422 1.4813 1.4885 1.5625<br />
19 ⁄ 16 –12 UN 2A 0.0018 1.5607 1.5493 — 1.5066 1.5007 1.4615 2B 1.472 1.490 1.5084 1.5160 1.5625<br />
3A 0.0000 1.5625 1.5511 — 1.5084 1.5040 1.4633 3B 1.4720 1.4823 1.5084 1.5141 1.5625<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
UNIFIED SCREW THREADS 1749
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