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| Nominal Size or Basic Screw Diameter | Crown Diameter, A | Washer Diameter, B | Head Height, H | Washer Thickness, U | Slot Width, J | Slot Depth, T | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | |||
| 4 | 0.177 | 0.261 | 0.243 | 0.079 | 0.067 | 0.030 | 0.039 | 0.031 | 0.048 | 0.038 |
| 5 | 0.198 | 0.291 | 0.272 | 0.088 | 0.075 | 0.040 | 0.043 | 0.035 | 0.053 | 0.041 |
| 6 | 0.218 | 0.321 | 0.301 | 0.096 | 0.084 | 0.040 | 0.048 | 0.039 | 0.058 | 0.043 |
| 8 | 0.259 | 0.380 | 0.358 | 0.113 | 0.101 | 0.040 | 0.054 | 0.045 | 0.067 | 0.051 |
| 10 | 0.300 | 0.439 | 0.416 | 0.130 | 0.118 | 0.050 | 0.060 | 0.050 | 0.071 | 0.055 |
| 12 | 0.341 | 0.498 | 0.473 | 0.148 | 0.134 | 0.050 | 0.067 | 0.056 | 0.085 | 0.067 |
| 1/4 | 0.395 | 0.576 | 0.548 | 0.170 | 0.157 | 0.050 | 0.075 | 0.064 | 0.098 | 0.083 |
Notes :