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| Nominal Size or Basic Screw Diameter | Head Diameter, A | Head Height, H | 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 | 0.055 | 0.029 | 0.018 | 0 | 0.030 | 0.014 |
| 1 | 0.164 | 0.149 | 0.045 | 0.037 | 0.063 | 0.037 | 0.018 | 0 | 0.038 | 0.022 |
| 2 | 0.194 | 0.180 | 0.053 | 0.044 | 0.091 | 0.051 | 0.029 | 1 | 0.049 | 0.033 |
| 3 | 0.226 | 0.211 | 0.061 | 0.051 | 0.098 | 0.058 | 0.029 | 1 | 0.056 | 0.040 |
| 4 | 0.257 | 0.241 | 0.069 | 0.059 | 0.101 | 0.061 | 0.029 | 1 | 0.059 | 0.043 |
| 5 | 0.289 | 0.272 | 0.078 | 0.066 | 0.117 | 0.077 | 0.030 | 1 | 0.075 | 0.059 |
| 6 | 0.321 | 0.303 | 0.086 | 0.074 | 0.141 | 0.071 | 0.041 | 2 | 0.065 | 0.047 |
| 8 | 0.384 | 0.364 | 0.102 | 0.088 | 0.155 | 0.085 | 0.041 | 2 | 0.079 | 0.061 |
| 10 | 0.448 | 0.425 | 0.118 | 0.103 | 0.171 | 0.101 | 0.042 | 2 | 0.095 | 0.077 |
| 12 | 0.511 | 0.487 | 0.134 | 0.118 | 0.227 | 0.113 | 0.055 | 3 | 0.101 | 0.083 |
| 1/4 | 0.573 | 0.546 | 0.150 | 0.133 | 0.241 | 0.127 | 0.056 | 3 | 0.115 | 0.097 |
| 5/16 | 0.68 | 0.666 | 0.183 | 0.162 | 0.326 | 0.178 | 0.086 | 4 | 0.161 | 0.143 |
| 3/8 | 0.823 | 0.787 | 0.215 | 0.191 | 0.351 | 0.210 | 0.086 | 4 | 0.192 | 0.174 |
| 7/16 | 0.948 | 0.907 | 0.248 | 0.221 | 0.387 | 0.240 | 0.086 | 4 | 0.223 | 0.205 |
| 1/2 | 1.073 | 1.028 | 0.280 | 0.250 | 0.415 | 0.269 | 0.086 | 4 | 0.251 | 0.233 |
| 9/16 | 1.198 | 1.149 | 0.312 | 0.279 | 0.420 | 0.274 | 0.086 | 4 | 0.256 | 0.238 |
| 5/8 | 1.323 | 1.269 | 0.345 | 0.309 | 0.524 | 0.293 | 0.097 | 5 | 0.266 | 0.245 |
| 3/4 | 1.573 | 1.511 | 0.410 | 0.368 | 0.581 | 0.351 | 0.098 | 5 | 0.323 | 0.302 |
Notes :
Where specifying nominal size in decimals, zeros preceding the decimals and in the fourth decimal place shall be omitted.