Table 8b. Limiting Dimensions of American National Standard Centralizing Acme Single-Start Screw Threads, Classes 2C, 3C, and 4C ANSI/ASME B1.5-1997 (R2014) Nominal Diameter, D 1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8 1 1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2 Threads per Inch a 10 8 6 6 5 5 5 4 4 Limiting Diameters External Threads Classes 2C, 3C, and 4C, Major Diameter Max 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000 Class 2C, Major Diameter Min 0.4975 0.6222 0.7470 0.8717 0.9965 1.1213 1.2461 1.3709 1.4957 Class 3C, Major Diameter Min 0.4989 0.6238 0.7487 0.8736 0.9985 1.1234 1.2483 1.3732 1.4982 Class 4C, Major Diameter Min 0.4993 0.6242 0.7491 0.8741 0.9990 1.1239 1.2489 1.3738 1.4988 Classes 2C, 3C, and 4C, Minor Diameter Max 0.3800 0.4800 0.5633 0.6883 0.7800 0.9050 1.0300 1.1050 1.2300 Class 2C, Minor Diameter Min 0.3594 0.4570 0.5371 0.6615 0.7509 0.8753 0.9998 1.0719 1.1965 Class 3C, Minor Diameter Min 0.3704 0.4693 0.5511 0.6758 0.7664 0.8912 1.0159 1.0896 1.2144 Class 4C, Minor Diameter Min 0.3731 0.4723 0.5546 0.6794 0.7703 0.8951 1.0199 1.0940 1.2188 Class 2C, Pitch Diameter { Max 0.4443 0.5562 0.6598 0.7842 0.8920 1.0165 1.1411 1.2406 1.3652 Min 0.4306 0.5408 0.6424 0.7663 0.8726 0.9967 1.1210 1.2186 1.3429 Class 3C, Pitch Diameter { Max 0.4458 0.5578 0.6615 0.7861 0.8940 1.0186 1.1433 1.2430 1.3677 Min 0.4394 0.5506 0.6534 0.7778 0.8849 1.0094 1.1339 1.2327 1.3573 Class 4C, Pitch Diameter { Max 0.4472 0.5593 0.6632 0.7880 0.8960 1.0208 1.1455 1.2453 1.3701 Min 0.4426 0.5542 0.6574 0.7820 0.8895 1.0142 1.1388 1.2380 1.3627 Internal Threads Classes 2C, 3C, and 4C, Major Diameter Min 0.5007 0.6258 0.7509 0.8759 1.0010 1.1261 1.2511 1.3762 1.5012 Classes 2C and 3C, Major Diameter Max 0.5032 0.6286 0.7539 0.8792 1.0045 1.1298 1.2550 1.3803 1.5055 Class 4C, Major Diameter Max 0.5021 0.6274 0.7526 0.8778 1.0030 0.1282 1.2533 1.3785 1.5036 Classes 2C, 3C, and 4C, Minor Diameter { Min 0.4100 0.5125 0.6000 0.7250 0.8200 0.9450 0.0700 1.1500 1.2750 Max 0.04150 0.5187 0.6083 0.7333 0.8300 0.9550 1.0800 1.1625 1.2875 Class 2C, Pitch Diameter { Min 0.4500 0.5625 0.6667 0.7917 0.9000 1.0250 1.1500 1.2500 1.3750 Max 0.4637 0.5779 0.6841 0.8096 0.9194 1.0448 1.1701 1.2720 1.3973 Class 3C, Pitch Diameter { Min 0.4500 0.5625 0.6667 0.7917 0.9000 1.0250 1.1500 1.2500 1.3750 Max 0.4564 0.5697 0.6748 0.8000 0.9091 1.0342 1.1594 1.2603 1.3854 Class 4C, Pitch Diameter { Min 0.4500 0.5625 0.6667 0.7917 0.9000 1.0250 1.1500 1.2500 1.3750 Max 0.4546 0.5676 0.6725 0.7977 0.9065 1.0316 1.1567 1.2573 1.3824
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