'Continental' Whitworth Form Threads (55 Deg Thread Angle) |
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| Thread Form Data | ||||||||
| Diameter | O/Diameter | Core | Pitch | Depth | Radius | Effective Dia | T.P.I | |
| 1/4" | 0.2425 | 0.1859 | 0.0500 | 0.0283 | 0.0069 | 0.2142 | 20 | |
| 5/16" | 0.3042 | 0.2413 | 0.0555 | 0.0314 | 0.0076 | 0.2769 | 18 | |
| 3/8" | 0.3657 | 0.2950 | 0.0625 | 0.0353 | 0.0086 | 0.3304 | 16 | |
| 1/2" | 0.4876 | 0.3932 | 0.0833 | 0.0472 | 0.0114 | 0.4404 | 12 | |
| 5/8" | 0.6115 | 0.5085 | 0.0909 | 0.0515 | 0.0125 | 0.5600 | 11 | |
| 3/4" | 0.7353 | 0.6218 | 0.1000 | 0.0567 | 0.0137 | 0.6786 | 10 | |
| 7/8" | 0.8586 | 0.7327 | 0.1111 | 0.0629 | 0.0153 | 0.7957 | 9 | |
| 1" | 0.9815 | 0.8400 | 0.1250 | 0.0708 | 0.0172 | 0.9107 | 8 | |
| 1-1/8" | 1.1039 | 0.9420 | 0.1429 | 0.0809 | 0.0196 | 1.0230 | 7 | |
| 1-1/4" | 1.2289 | 1.0670 | 0.1429 | 0.0809 | 0.0196 | 1.1480 | 7 | |
| 1-3/8" | 1.3504 | 1.1616 | 0.1666 | 0.0944 | 0.0229 | 1.2560 | 6 | |
| 1-1/2" | 1.4754 | 1.2866 | 0.1666 | 0.0944 | 0.0229 | 1.3810 | 6 | |
| 1-5/8" | 1.5955 | 1.3689 | 0.2000 | 0.1133 | 0.0275 | 1.4822 | 5 | |
| 1-3/4" | 1.7205 | 1.4939 | 0.2000 | 0.1133 | 0.0275 | 1.6072 | 5 | |
| 2" | 1.9671 | 1.7153 | 0.2222 | 0.1259 | 0.0305 | 1.8412 | 4½ | |
| 2-1/4" | 2.2130 | 1.9299 | 0.2500 | 0.1415 | 0.0343 | 2.0715 | 4 | |
| 2-1/2" | 2.4630 | 2.1799 | 0.2500 | 0.1415 | 0.0343 | 2.3215 | 4 | |
| 3" | 2.9576 | 2.6341 | 0.2857 | 0.1618 | 0.0392 | 2.7958 | 3½ | |