Small Whitworth Form Threads (55 Deg Thread Angle) |
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| Thread Form Data | Tapping Drill | |||||||
| Diameter | O/Diameter | Core | Pitch | Depth | Radius | Effective Dia | T.P.I | Dec / Met / Frac |
| 1/16" | 0.0625 | 0.0411 | 0.01666 | 0.0107 | -- | 0.0518 | 60 | No 56 |
| 5/64" | 0.07813 | 0.0553 | 0.01786 | 0.0114 | -- | 0.0667 | 56 | 1.5mm |
| 3/32" | 0.09375 | 0.0670 | 0.02083 | 0.01334 | -- | 0.0804 | 48 | No 48 |
| 7/64" | 0.10938 | 0.0827 | 0.02083 | 0.01334 | -- | 0.0960 | 48 | No 44 |
| 1/8" | 0.12500 | 0.0929 | 0.02500 | 0.01605 | -- | 0.1085 | 40 | No 40 |
| 9/64" | 0.14063 | 0.1086 | 0.02500 | 0.01601 | -- | 0.1246 | 40 | No 33 |
| 5/32" | 0.15625 | 0.1162 | 0.03125 | 0.02003 | -- | 0.1362 | 32 | No 31 |
| 11/64" | 0.17188 | 0.1319 | 0.03125 | 0.01999 | -- | 0.1519 | 32 | No 29 |
| 3/16" | 0.18750 | 0.1341 | 0.04166 | 0.0267 | -- | 0.1608 | 24 | No 28 |
| 13/64" | 0.20313 | 0.1408 | 0.04166 | 0.0267 | -- | -0.1764 | 24 | 5/32" |
| 7/32" | 0.21875 | 0.1654 | 0.04166 | 0.0267 | -- | 0.1921 | 24 | 11/64" |
| 15/64" | 0.23438 | 0.1811 | 0.04166 | 0.02664 | -- | 0.2077 | 24 | 3/16" |