Electrical
Conduit Whitworth Form Threads (55 Deg Thread Angle) |
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| Thread Form Data | Tapping Drill | Electrical Conduit Nut Sizes | |||||||
| O/Diameter | Core | Pitch | Depth | Effective Dia | T.P.I | Dec / Met / Frac | Across Flats | Acr. Corners | Thickness |
| 1/2" | 0.4289 | 0.0555 | 0.0356 | 0.4644 | 18 | 7/16" | 0.815" | 0.950" | 3/16" |
| 5/8" | 0.5539 | 0.0555 | 0.0356 | 0.5894 | 18 | 35/64" | 0.915" | 1.060" | 3/16" |
| 3/4" | 0.6700 | 0.0625 | 0.0400 | 0.7100 | 16 | 11/16" | 1.092" | 1.270" | 1/4" |
| 1" | 0.9200 | 0.0625 | 0.0400 | 0.9600 | 16 | 15/16" | 1.472" | 1.690" | 1/4" |
| 1-1/4" | 1.1700 | 0.0625 | 0.0400 | 1.2100 | 16 | 1-3/16" | 1.662" | 2.040" | 1/4" |
| 1-1/2" | 1.4085 | 0.0714 | 0.0400 | 1.4543 | 14 | 1-27/64" | 2.040" | 2.350" | 5/16" |
| 2" | 1.9085 | 0.0714 | 0.0457 | 1.9543 | 14 | 1-59/64" | 2.570" | 2.960" | 3/8" |
| 2-1/2" | 2.4085 | 0.0714 | 0.0457 | 2.4543 | 14 | 2-27/64" | 3.150" | 3.630" | 3/8" |