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Flat Head Socket Cap Screw (FHSCS)
A type of socket with a tapered, or countersunk, head and a recessed hex. Will sit flush into material with a countersunk hole.
Dimensions
ASME B18.3
| Thread Dia. | Head Dia. | Head Height | Hex Socket |
|---|---|---|---|
| No. 4 | 0.218 - 0.255 | 0.083 | 1/16 |
| No. 5 | 0.240 - 0.281 | 0.090 | 5/64 |
| No. 6 | 0.263 - 0.307 | 0.097 | 5/64 |
| No. 8 | 0.311 - 0.359 | 0.112 | 3/32 |
| No. 10 | 0.359 - 0.411 | 0.127 | 1/8 |
| 1/4 | 0.480 - 0.531 | 0.161 | 5/32 |
| 5/16 | 0.600 - 0.656 | 0.198 | 3/16 |
| 3/8 | 0.720 - 0.781 | 0.234 | 7/32 |
| 7/16 | 0.781 - 0.844 | 0.234 | 1/4 |
| 1/2 | 0.872 - 0.938 | 0.251 | 5/16 |
| 5/8 | 1.112 - 1.188 | 0.324 | 3/8 |
| 3/4 | 1.355 - 1.438 | 0.396 | 1/2 |