Table 14b. Limiting Dimensions for American National Standard Stub Acme Single-Start Screw Threads ANSI/ASME B1.8-1988 (R2016) Nominal Diameter, D 1 ∕ 4 5 ∕ 16 3 ∕ 8 7 ∕ 16 1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8 1 1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 Threads per Inch a 16 14 12 12 10 8 6 6 5 5 5 4 Limiting Diameters External Threads Major Dia. { Max ( D ) 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 Min 0.2469 0.3089 0.3708 0.4333 0.4950 0.6188 0.7417 0.8667 0.9900 1.1150 1.2400 1.3625 Pitch Dia. { Max 0.2272 0.2871 0.3451 0.4076 0.4643 0.5812 0.6931 0.8175 0.9320 1.0565 1.1811 1.2906 Min 0.2167 0.2757 0.3328 0.3950 0.4506 0.5658 0.6757 0.7996 0.9126 1.0367 1.1610 1.2686 Minor Dia. { Max 0.2024 0.2597 0.3150 0.3775 0.4200 0.5300 0.6300 0.7550 0.8600 0.9850 1.1100 1.2050 Min 0.1919 0.2483 0.3027 0.3649 0.4063 0.5146 0.6126 0.7371 0.8406 0.9652 1.0899 1.1830 Internal Threads Major Dia. { Min 0.2600 0.3225 0.3850 0.4475 0.5200 0.6450 0.7700 0.8950 1.0200 1.1450 1.2700 1.3950 Max 0.2705 0.3339 0.3973 0.4601 0.5337 0.6604 0.7874 0.9129 1.0394 1.1648 1.2901 1.4170 Pitch Dia. { Min 0.2312 0.2911 0.3500 0.4125 0.4700 0.5875 0.7000 0.8250 0.9400 1.0650 1.1900 1.3000 Max 0.2417 0.3025 0.3623 0.4251 0.4837 0.6029 0.7174 0.8429 0.9594 1.0848 1.2101 1.3220 Minor Dia. { Min 0.2125 0.2696 0.3250 0.3875 0.4400 0.5500 0.6500 0.7750 0.8800 1.0050 1.1300 1.2250 Max 0.2156 0.2732 0.3292 0.3917 0.4450 0.5562 0.6583 0.7833 0.8900 1.0150 1.1400 1.2375 Nominal Diameter, D 1 1 ∕ 2 1 3 ∕ 4 2 2 1 ∕ 4 2 1 ∕ 2 2 3 ∕ 4 3 3 1 ∕ 2 4 4 1 ∕ 2 5 Threads per Inch a 4 4 4 3 3 3 2 2 2 2 2 Limiting Diameters External Threads Major Dia. { Max ( D ) 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.5000 4.0000 4.5000 5.0000 Min 1.4875 1.7375 1.9875 2.2333 2.4833 2.7333 2.9750 3.4750 3.9750 4.4750 4.9750 Pitch Dia. { Max 1.4152 1.6645 1.9137 2.1380 2.3874 2.6367 2.8360 3.3350 3.8340 4.3330 4.8319 Min 1.3929 1.6416 1.8902 2.1117 2.3606 2.6094 2.8044 3.3026 3.8008 4.2991 4.7973 Minor Dia. { Max 1.3300 1.5800 1.8300 2.0300 2.2800 2.5300 2.6800 3.1800 3.6800 4.1800 4.6800 Min 1.3077 1.5571 1.8065 2.0037 2.2532 2.5027 2.6484 3.1476 3.6468 4.1461 4.6454 Internal Threads Major Dia. { Min 1.5200 1.7700 2.0200 2.2700 2.5200 2.7700 3.0200 3.5200 4.0200 4.5200 5.0200 Max 1.5423 1.7929 2.0435 2.2963 2.5468 2.7973 3.0516 3.5524 4.0532 4.5539 5.0546 Pitch Dia. { Min 1.4250 1.6750 1.9250 2.1500 2.4000 2.6500 2.8500 3.3500 3.8500 4.3500 4.8500 Max 1.4473 1.6979 1.9485 2.1763 2.4268 2.6773 2.8816 3.3824 3.8832 4.3839 4.8846 Minor Dia. { Min 1.3500 1.6000 1.8500 2.0500 2.3000 2.5500 2.7000 3.2000 3.7000 4.2000 4.7000 Max 1.3625 1.6125 1.8625 2.0667 2.3167 2.5667 2.7250 3.2250 3.7250 4.2250 4.7250 a All other dimensions are given in inches.
Made with FlippingBook - Share PDF online