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Hexagon socket countersunk head bolts and screws (Inch)
| D | A | H | J | T | ||||
| Nominal Size or Basic Screw Diameter |
Head Diameter |
Head Height |
Hexagon Socket Size |
Key Engagement |
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| Theoretical | Min | Reference | Tolerance | Nom | Min | |||
| 1/4 | 0.2500 | 0.531 | 0.480 | 0.161 | 0.016 | 5/32 | 0.156 | 0.111 |
| 5/16 | 0.3125 | 0.656 | 0.600 | 0.198 | 0.017 | 3/16 | 0.188 | 0.135 |
| 3/8 | 0.3750 | 0.781 | 0.720 | 0.234 | 0.018 | 7/32 | 0.219 | 0.159 |
| 7/16 | 0.4375 | 0.844 | 0.781 | 0.234 | 0.018 | 1/4 | 0.250 | 0.159 |
| 1/2 | 0.5000 | 0.938 | 0.872 | 0.251 | 0.018 | 5/16 | 0.312 | 0.172 |
| 5/8 | 0.6250 | 1.188 | 1.355 | 0.324 | 0.022 | 3/8 | 0.375 | 0.220 |