BSP Threads |
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| Thread Form Data | Tapping Drill | Clearance Drill | |||||||
| Diameter | O/Diameter | Core | Pitch | Depth | Radius | Effective Dia | T.P.I | Dec / Met / Frac | Dec / Met / Frac |
| 1/8" | 0.3830 | 0.3370 | 0.0357 | 0.0229 | 0.0049 | 0.3601 | 28 | 0.3445 - 8.75mm | 0.3858 - 9.80mm |
| 1/4" | 0.5180 | 0.4510 | 0.0526 | 0.0335 | 0.0072 | 0.4845 | 19 | 0.4646 - 11.80mm | 0.5312 - 17/32" |
| 3/8" | 0.6560 | 0.5890 | 0.0526 | 0.0335 | 0.0072 | 0.0225 | 19 | 0.6004 - 15.25mm | 0.6719 - 43/64" |
| 1/2" | 0.8250 | 0.7340 | 0.0714 | 0.0457 | 0.0098 | 0.7793 | 14 | 0.7500 - 3/4" | 0.8281 - 53/64" |
| 5/8" | 0.9020 | 0.8110 | 0.0714 | 0.0457 | 0.0098 | 0.8563 | 14 | 0.8281 - 53/64" | 0.9062 - 29/32" |
| 3/4" | 1.0410 | 0.9500 | 0.0714 | 0.0457 | 0.0098 | 0.9953 | 14 | 0.9646 - 24.50mm | 1.0469 - 1-3/64" |
| 7/8" | 1.1890 | 1.0980 | 0.0714 | 0.0457 | 0.0098 | 1.1433 | 14 | 1.1122 - 28.25mm | 1.2031 - 1-13/64" |
| 1" | 1.3090 | 1.1930 | 0.0909 | 0.0582 | 0.0125 | 1.2508 | 11 | 1.2106 - 30.75mm | 1.3125 - 1-5/16" |
| 1-1/4" | 1.6500 | 1.5340 | 0.0909 | 0.0582 | 0.0125 | 1.5918 | 11 | 1.5551 - 39.50mm | 1.6562 - 1-21/32" |
| 1-1/2" | 1.8820 | 1.7660 | 0.0909 | 0.0582 | 0.0125 | 1.8238 | 11 | 1.7812 - 1-25/32" | 1.8906 - 1-57/54" |
| 1-3/4" | 2.1160 | 2.0000 | 0.0909 | 0.0582 | 0.0125 | 2.0578 | 11 | 2.0079 - 51.00mm | 2.1250 - 2-1/8" |
| 2" | 2.3470 | 2.2310 | 0.0909 | 0.0582 | 0.0125 | 2.2888 | 11 | 2.2500 - 2-1/4" | 2.3594 - 2-23/64" |