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| Nominal Size or Basic Screw Diameter | Head Diameter, A | Head Height, H | Head Radius, R, Min. | Recess Diameter, M | Recess Depth, T | Recess Width, N | Driver Size | Recess Penetration Gaging Depth | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | ||||||
| 0 | 0.131 | 0.119 | 0.037 | 0.029 | 0.087 | 0.070 | 0.031 | 0.021 | – | Note 3 | Note 3 |
| 1 | 0.164 | 0.149 | 0.045 | 0.037 | 0.107 | 0.087 | 0.042 | 0.023 | – | Note 3 | Note 3 |
| 2 | 0.194 | 0.180 | 0.053 | 0.044 | 0.129 | 0.105 | 0.054 | 0.026 | – | 0.033 | 0.024 |
| 3 | 0.226 | 0.211 | 0.061 | 0.051 | 0.151 | 0.122 | 0.065 | 0.028 | – | 0.045 | 0.035 |
| 4 | 0.257 | 0.241 | 0.069 | 0.059 | 0.169 | 0.139 | 0.074 | 0.031 | – | 0.056 | 0.046 |
| 5 | 0.289 | 0.272 | 0.078 | 0.066 | 0.191 | 0.157 | 0.086 | 0.033 | – | 0.068 | 0.057 |
| 6 | 0.321 | 0.303 | 0.086 | 0.074 | 0.211 | 0.175 | 0.097 | 0.035 | – | 0.079 | 0.068 |
| 8 | 0384 | 0.364 | 0.102 | 0.088 | 0.254 | 0.209 | 0.115 | 0.041 | – | 0.102 | 0.091 |
| 10 | 0.448 | 0.425 | 0.118 | 0.103 | 0.283 | 0.244 | 0.138 | 0.046 | – | 0.126 | 0.113 |
| 12 | 0.511 | 0.487 | 0.134 | 0.118 | 0.336 | 0.279 | 0.160 | 0.051 | – | 0.148 | 0.136 |
| 1/4 | 0.573 | 0.546 | 0.150 | 0.133 | 0.375 | 0.313 | 0.174 | 0.057 | – | 0.171 | 0.157 |
| 5/16 | 0.698 | 0.666 | 0.183 | 0.162 | 0.457 | 0.382 | 0.219 | 0.067 | – | 0.217 | 0.201 |
| 3/8 | 0.823 | 0.787 | 0.215 | 0.191 | 0.538 | 0.446 | 0.261 | 0.076 | – | 0.259 | 0.242 |
| 7/16 | 0.948 | 0.907 | 0.248 | 0.221 | 0.619 | 0.511 | 0.304 | 0.086 | – | 0.303 | 0.284 |
| 1/2 | 1.073 | 1.028 | 0.280 | 0.250 | 0.701 | 0.588 | 0.354 | 0.097 | – | 0.354 | 0.333 |
| 9/16 | 1.198 | 1.149 | 0.312 | 0.279 | 0.783 | 0.588 | 0.354 | 0.097 | – | 0.354 | 0.333 |
| 5/8 | 1.323 | 1.269 | 0.345 | 0.309 | 0.863 | 0.588 | 0.354 | 0.097 | – | 0.354 | 0.333 |
| 3/4 | 1.573 | 1.511 | 0.410 | 0.368 | 1.024 | 0.588 | 0.354 | 0.097 | – | 0.354 | 0.333 |
Notes :