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| Nominal size of Bolts or screw |
Diameter of hole A |
Outside diameter B |
Thickness1 C |
|||||
|---|---|---|---|---|---|---|---|---|
| max. | min. | max. | min. | Heavy gauge | Light gauge | |||
| Inch | Inch | S.W.G. | Inch | S.W.G. | Inch | |||
| 1/4 | 0.270 | 0.265 | 0.562 | 0.557 | 17 | 0.056 | 20 | 0.036 |
| 5/16 | 0.333 | 0.328 | 0.625 | 0.620 | 15 | 0.072 | 19 | 0.040 |
| 3/8 | 0.395 | 0.390 | 0.750 | 0.745 | 15 | 0.072 | 18 | 0.048 |
| 7/16 | 0.458 | 0.453 | 0.875 | 0.870 | 13 | 0.092 | 18 | 0.048 |
| 1/2 | 0.520 | 0.515 | 1.000 | 0.995 | 13 | 0.092 | 17 | 0.056 |
| 9/16 | 0.593 | 0.588 | 1.125 | 1.115 | 12 | 0.104 | 17 | 0.056 |
| 5/8 | 0.656 | 0.651 | 1.250 | 1.240 | 11 | 0.116 | 15 | 0.072 |
| 3/4 | 0.781 | 0.776 | 1.500 | 1.490 | 10 | 0.128 | 15 | 0.072 |
| 7/8 | 0.906 | 0.901 | 1.625 | 1.615 | 9 | 0.144 | 15 | 0.072 |
| 1 | 1.031 | 1.026 | 1.875 | 1.865 | 8 | 0.160 | 15 | 0.072 |
| 1 1/8 | 1.156 | 1.151 | 2.125 | 2.115 | 7 | 0.176 | 13 | 0.092 |
| 1 1/4 | 1.281 | 1.276 | 2.375 | 2.355 | 7 | 0.176 | 11 | 0.116 |
| 1 3/8 | 1.406 | 1.401 | 2.625 | 2.605 | 6 | 0.192 | - | - |
| 1 1/2 | 1.531 | 1.526 | 2.875 | 2.855 | 6 | 0.192 | - | - |
| 1 3/4 | 1.781 | 1.776 | 3.375 | 3.345 | 5 | 0.212 | - | - |
| 2 | 2.031 | 2.026 | 3.625 | 3.595 | 5 | 0.212 | - | - |
Notes:
1) Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.