ASME B18.31.2 Tap End Full Body Studs
ASME B18.31.2 Dimensions for Tap End Full Body Studs (mm)
| Nominal Size |
Diameter, D |
Tap-End Full Thread Length, BM |
Umax = 2P | Minimum Body Diameter, DS | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nominal | Min | Max | UNC and NC-5 Thread |
UNF Thread | 8UN Thread | UNC and NC-5 HF Threads |
UNF Threads |
8UN Threads |
||
| ¼ | 6.350 | 9.525 | 8.890 | 10.160 | 2.540 | 1.803 | … | 6.121 | 6.172 | … |
| 5/16 | 7.938 | 11.913 | 11.176 | 12.649 | 2.819 | 2.108 | … | 7.696 | 7.722 | … |
| 3/8 | 9.525 | 14.300 | 13.513 | 15.088 | 3.175 | 2.108 | … | 9.246 | 9.322 | … |
| 7/16 | 11.113 | 16.662 | 15.748 | 17.577 | 3.632 | 2.540 | … | 10.820 | 10.871 | … |
| ½ | 12.700 | 19.050 | 17.983 | 20.117 | 3.912 | 2.540 | … | 12.395 | 12.471 | … |
| 9/16 | 14.288 | 21.438 | 20.371 | 22.758 | 4.242 | 2.819 | … | 13.970 | 14.021 | … |
| 5/8 | 15.875 | 23.825 | 22.657 | 24.968 | 4.623 | 2.819 | … | 15.519 | 15.621 | … |
| ¾ | 19.050 | 28.575 | 27.305 | 29.845 | 5.080 | 3.175 | … | 18.669 | 18.771 | … |
| 7/8 | 22.225 | 33.350 | 31.953 | 34.747 | 5.639 | 3.632 | … | 21.819 | 21.920 | … |
| 1 | 25.400 | 38.100 | 36.525 | 39.675 | 6.350 | 4.242 | … | 24.968 | 25.070 | … |
| 1⅛ | 28.575 | 42.875 | 41.275 | 44.450 | 7.264 | 4.242 | 6.350 | 28.092 | 28.245 | 28.143 |
| 1¼ | 31.750 | 47.625 | 46.050 | 49.225 | 7.264 | 4.242 | 6.350 | 31.267 | 31.420 | 31.318 |
| 1⅜ | 34.925 | 52.400 | 50.800 | 53.975 | 8.458 | 4.242 | 6.350 | 34.392 | 34.595 | 34.493 |
| 1½ | 38.100 | 57.150 | 55.575 | 58.750 | 8.458 | 4.242 | 6.350 | 37.567 | 37.770 | 37.668 |
| 1⅝ | 41.275 | 61.925 | 60.325 | 63.500 | … | … | 6.350 | … | … | 40.843 |
| 1¾ | 44.450 | 66.675 | 65.100 | 68.275 | 10.160 | … | 6.350 | 43.866 | … | 44.018 |
| 1⅞ | 47.625 | 71.450 | 69.850 | 73.025 | … | … | 6.350 | … | … | 47.193 |
| 2 | 50.800 | 76.200 | 74.295 | 78.105 | 11.278 | … | 6.350 | 50.165 | … | 50.368 |
| 2¼ | 57.150 | 85.725 | 83.820 | 87.630 | 11.278 | … | 6.350 | 56.515 | … | 56.718 |
| 2½ | 63.500 | 95.250 | 93.345 | 97.155 | 12.700 | … | 6.350 | 62.814 | … | 63.068 |
| 2¾ | 69.850 | 104.775 | 102.870 | 106.680 | 12.700 | … | 6.350 | 69.164 | … | 69.418 |
| 3 | 76.200 | 114.300 | 112.395 | 116.205 | 12.700 | … | 6.350 | 75.514 | … | 75.743 |
| 3¼ | 82.550 | 123.825 | 121.285 | 126.365 | 12.700 | … | 6.350 | 81.864 | … | 82.093 |
| 3½ | 88.900 | 133.350 | 130.810 | 135.890 | 12.700 | … | 6.350 | 88.214 | … | 88.443 |
| 3¾ | 95.250 | 142.875 | 140.335 | 145.415 | 12.700 | … | 6.350 | 94.564 | … | 94.793 |
| 4 | 101.600 | 152.400 | 149.860 | 154.940 | 12.700 | … | 6.350 | 100.914 | … | 101.143 |
ASME B18.31.2 Tap End Full Body Studs Length Tolerances (mm)
| Range, LT | Tap-End Studs Tolerance |
|---|---|
| From 19.05 through 63.5 | ±0.762 |
| Over 63.5 through 101.6 | ±1.270 |
| Over 101.6 through 203.2 | ±2.032 |
| Over 203.2 through 406.4 | ±2.540 |
| Over 406.4 | ±3.048 |
ASME B18.31.2 Dimensions for Tap End Full Body Studs (Inch)
| Nominal Size |
Diameter, D |
Tap-End Full Thread Length, BM |
Umax = 2P | Minimum Body Diameter, DS | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nominal | Min | Max | UNC and NC-5 Thread |
UNF Thread | 8UN Thread | UNC and NC-5 HF Threads |
UNF Threads |
8UN Threads |
||
| ¼ | 0.2500 | 0.375 | 0.350 | 0.400 | 0.100 | 0.071 | … | 0.241 | 0.243 | … |
| 5/16 | 0.3125 | 0.469 | 0.440 | 0.498 | 0.111 | 0.083 | … | 0.303 | 0.304 | … |
| 3/8 | 0.3750 | 0.563 | 0.532 | 0.594 | 0.125 | 0.083 | … | 0.364 | 0.367 | … |
| 7/16 | 0.4375 | 0.656 | 0.620 | 0.692 | 0.143 | 0.100 | … | 0.426 | 0.428 | … |
| ½ | 0.5000 | 0.750 | 0.708 | 0.792 | 0.154 | 0.100 | … | 0.488 | 0.491 | … |
| 9/16 | 0.5625 | 0.844 | 0.802 | 0.896 | 0.167 | 0.111 | … | 0.550 | 0.552 | … |
| 5/8 | 0.6250 | 0.938 | 0.892 | 0.983 | 0.182 | 0.111 | … | 0.611 | 0.615 | … |
| ¾ | 0.7500 | 1.125 | 1.075 | 1.175 | 0.200 | 0.125 | … | 0.735 | 0.739 | … |
| 7/8 | 0.8750 | 1.313 | 1.258 | 1.368 | 0.222 | 0.143 | … | 0.859 | 0.863 | … |
| 1 | 1.0000 | 1.500 | 1.438 | 1.562 | 0.250 | 0.167 | … | 0.983 | 0.987 | … |
| 1⅛ | 1.1250 | 1.688 | 1.625 | 1.750 | 0.286 | 0.167 | 0.250 | 1.106 | 1.112 | 1.108 |
| 1¼ | 1.2500 | 1.875 | 1.813 | 1.938 | 0.286 | 0.167 | 0.250 | 1.231 | 1.237 | 1.233 |
| 1⅜ | 1.3750 | 2.063 | 2.000 | 2.125 | 0.333 | 0.167 | 0.250 | 1.354 | 1.362 | 1.358 |
| 1½ | 1.5000 | 2.250 | 2.188 | 2.313 | 0.333 | 0.167 | 0.250 | 1.479 | 1.487 | 1.483 |
| 1⅝ | 1.6250 | 2.438 | 2.375 | 2.500 | … | … | 0.250 | … | … | 1.608 |
| 1¾ | 1.7500 | 2.625 | 2.563 | 2.688 | 0.400 | … | 0.250 | 1.727 | … | 1.733 |
| 1⅞ | 1.8750 | 2.813 | 2.750 | 2.875 | … | … | 0.250 | … | … | 1.858 |
| 2 | 2.0000 | 3.000 | 2.925 | 3.075 | 0.444 | … | 0.250 | 1.975 | … | 1.983 |
| 2¼ | 2.2500 | 3.375 | 3.300 | 3.450 | 0.444 | … | 0.250 | 2.225 | … | 2.233 |
| 2½ | 2.5000 | 3.750 | 3.675 | 3.825 | 0.500 | … | 0.250 | 2.473 | … | 2.483 |
| 2¾ | 2.7500 | 4.125 | 4.050 | 4.200 | 0.500 | … | 0.250 | 2.723 | … | 2.733 |
| 3 | 3.0000 | 4.500 | 4.425 | 4.575 | 0.500 | … | 0.250 | 2.973 | … | 2.982 |
| 3¼ | 3.2500 | 4.875 | 4.775 | 4.975 | 0.500 | … | 0.250 | 3.223 | … | 3.232 |
| 3½ | 3.5000 | 5.250 | 5.150 | 5.350 | 0.500 | … | 0.250 | 3.473 | … | 3.482 |
| 3¾ | 3.7500 | 5.625 | 5.525 | 5.725 | 0.500 | … | 0.250 | 3.723 | … | 3.732 |
| 4 | 4.0000 | 6.000 | 5.900 | 6.100 | 0.500 | … | 0.250 | 3.973 | … | 3.982 |
ASME B18.31.2 Tap End Full Body Studs Length Tolerances (Inch)
| Range, LT | Tap-End Studs Tolerance |
|---|---|
| From 3/4 through 2 1/2 | ±0.03 |
| Over 2 1/2 through 4 | ±0.05 |
| Over 4 through 8 | ±0.08 |
| Over 8 through 16 | ±0.10 |
| Over 16 | ±0.12 |