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 />
113 ⁄ 16 –16 UN 2A 0.0016 1.8109 1.8015 — 1.7703 1.7650 1.7364 2B 1.745 1.759 1.7719 1.7788 1.8125<br />
3A 0.0000 1.8125 1.8031 — 1.7719 1.7679 1.7380 3B 1.7450 1.7533 1.7719 1.7771 1.8125<br />
113 ⁄ 16 –20 UN 2A 0.0015 1.8110 1.8029 — 1.7785 1.7737 1.7515 2B 1.758 1.770 1.7800 1.7863 1.8125<br />
3A 0.0000 1.8125 1.8044 — 1.7800 1.7764 1.7530 3B 1.7580 1.7662 1.7800 1.7847 1.8125<br />
17 ⁄ 8 –6 UN 2A 0.0025 1.8725 1.8543 — 1.7642 1.7558 1.6741 2B 1.695 1.725 1.7667 1.7777 1.8750<br />
3A 0.0000 1.8750 1.8568 — 1.7667 1.7604 1.6766 3B 1.6950 1.7146 1.7667 1.7749 1.8750<br />
17 ⁄ 8–8 UN 2A 0.0023 1.8727 1.8577 1.8502 1.7915 1.7838 1.7239 2B 1.740 1.765 1.7938 1.8038 1.8750<br />
3A 0.0000 1.8750 1.8600 — 1.7938 1.7881 1.7262 3B 1.7400 1.7547 1.7938 1.8013 1.8750<br />
17 ⁄ 8 –10 UNS 2A 0.0019 1.8731 1.8602 — 1.8081 1.8016 1.7541 2B 1.767 1.788 1.8100 1.8184 1.8750<br />
17 ⁄ 8 –12 UN 2A 0.0018 1.8732 1.8618 — 1.8191 1.8131 1.7740 2B 1.785 1.803 1.8209 1.8287 1.8750<br />
3A 0.0000 1.8750 1.8636 — 1.8209 1.8164 1.7758 3B 1.7850 1.7948 1.8209 1.8267 1.8750<br />
17 ⁄ 8 –14 UNS 2A 0.0017 1.8733 1.8630 — 1.8269 1.8213 1.7883 2B 1.798 1.814 1.8286 1.8359 1.8750<br />
17 ⁄ 8 –16 UN 2A 0.0016 1.8734 1.8640 — 1.8328 1.8275 1.7989 2B 1.807 1.821 1.8344 1.8413 1.8750<br />
3A 0.0000 1.8750 1.8656 — 1.8344 1.8304 1.8005 3B 1.8070 1.8158 1.8344 1.8396 1.8750<br />
17 ⁄ 8 –18 UNS 2A 0.0015 1.8735 1.8648 — 1.8374 1.8323 1.8074 2B 1.815 1.828 1.8389 1.8455 1.8750<br />
17 ⁄ 8 –20 UN 2A 0.0015 1.8735 1.8654 — 1.8410 1.8362 1.8140 2B 1.821 1.832 1.8425 1.8488 1.8750<br />
3A 0.0000 1.8750 1.8669 — 1.8425 1.8389 1.8155 3B 1.8210 1.8287 1.8425 1.8472 1.8750<br />
115 ⁄ 16–6 UN 2A 0.0026 1.9349 1.9167 — 1.8266 1.8181 1.7365 2B 1.757 1.788 1.8292 1.8403 1.9375<br />
3A 0.0000 1.9375 1.9193 — 1.8292 1.8228 1.7391 3B 1.7570 1.7771 1.8292 1.8375 1.9375<br />
115 ⁄ 16 –8 UN 2A 0.0023 1.9352 1.9202 — 1.8540 1.8463 1.7864 2B 1.802 1.827 1.8563 1.8663 1.9375<br />
3A 0.0000 1.9375 1.9225 — 1.8563 1.8505 1.7887 3B 1.8020 1.8172 1.8563 1.8638 1.9375<br />
115 ⁄ 16 –12 UN 2A 0.0018 1.9357 1.9243 — 1.8816 1.8755 1.8365 2B 1.847 1.865 1.8834 1.8913 1.9375<br />
3A 0.0000 1.9375 1.9261 — 1.8834 1.8789 1.8383 3B 1.8470 1.8573 1.8834 1.8893 1.9375<br />
115 ⁄ 16 –16 UN 2A 0.0016 1.9359 1.9265 — 1.8953 1.8899 1.8614 2B 1.870 1.884 1.8969 1.9039 1.9375<br />
3A 0.0000 1.9375 1.9281 — 1.8969 1.8929 1.8630 3B 1.8700 1.8783 1.8969 1.9021 1.9375<br />
115 ⁄ 16 –20 UN 2A 0.0015 1.9360 1.9279 — 1.9035 1.8986 1.8765 2B 1.883 1.895 1.9050 1.9114 1.9375<br />
3A 0.0000 1.9375 1.9294 — 1.9050 1.9013 1.8780 3B 1.8830 1.8912 1.9050 1.9098 1.9375<br />
Copyright 2004, Industrial Press, Inc., New York, NY<br />
1752<br />
UNIFIED SCREW THREADS
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