
Dimensions of Plain (Unslotted) and Slotted Regular and Large Hex Head Screws
| Nominal Size or Basic Screw Diameter |
A | W | A | W | H | J | T | F | ||||||||||
| Regular Head [Note 7] |
Large Head [Notes 7, 8] |
Head Height | Slot Width | Slot Depth | Protrusion Beyond Gaging Ring | |||||||||||||
| Width Across Flats | Across Corners | Width Across Flats | Across Corners | |||||||||||||||
| Max | Min | Min | Max | Min | Min | Max | Min | Max | Min | Max | Min | Min | ||||||
| 1 | 0.0730 | 0.125 | 0.120 | 0.134 | - | - | - | 0.044 | 0.036 | - | - | - | - | 0.022 | ||||
| 2 | 0.0860 | 0.125 | 0.120 | 0.134 | - | - | - | 0.050 | 0.040 | - | - | - | - | 0.024 | ||||
| 3 | 0.0990 | 0.188 | 0.181 | 0.202 | - | - | - | 0.055 | 0.044 | - | - | - | - | 0.026 | ||||
| 4 | 0.1120 | 0.188 | 0.181 | 0.202 | 0.219 | 0.213 | 0.238 | 0.060 | 0.049 | 0.039 | 0.031 | 0.036 | 0.025 | 0.029 | ||||
| 5 | 0.1250 | 0.188 | 0.181 | 0.202 | 0.250 | 0.244 | 0.272 | 0.070 | 0.058 | 0.043 | 0.035 | 0.042 | 0.030 | 0.035 | ||||
| 6 | 0.1380 | 0.250 | 0.244 | 0.272 | - | - | - | 0.093 | 0.080 | 0.048 | 0.039 | 0.046 | 0.033 | 0.048 | ||||
| 7 | 0.1510 | 0.250 | 0.244 | 0.272 | - | - | - | 0.093 | 0.080 | 0.048 | 0.039 | 0.054 | 0.040 | 0.048 | ||||
| 8 | 0.1640 | 0.250 | 0.244 | 0.272 | 0.312 | 0.305 | 0.340 | 0.110 | 0.096 | 0.054 | 0.045 | 0.066 | 0.052 | 0.058 | ||||
| 10 | 0.1900 | 0.312 | 0.305 | 0.340 | - | - | - | 0.120 | 0.105 | 0.060 | 0.050 | 0.072 | 0.057 | 0.063 | ||||
| 12 | 0.2160 | 0.312 | 0.305 | 0.340 | 0.375 | 0.367 | 0.409 | 0.155 | 0.139 | 0.067 | 0.056 | 0.093 | 0.077 | 0.083 | ||||
| 14 | 0.2420 | 0.375 | 0.367 | 0.409 | 0.438 | 0.428 | 0.477 | 0.190 | 0.172 | 0.075 | 0.064 | 0.101 | 0.083 | 0.103 | ||||
| 1/4 | 0.2500 | 0.375 | 0.367 | 0.409 | 0.438 | 0.428 | 0.477 | 0.190 | 0.172 | 0.075 | 0.064 | 0.101 | 0.083 | 0.103 | ||||
| 5/16 | 0.3125 | 0.500 | 0.489 | 0.545 | - | - | - | 0.230 | 0.208 | 0.084 | 0.072 | 0.122 | 0.100 | 0.125 | ||||
| 20 | 0.3200 | 0.500 | 0.489 | 0.545 | - | - | - | 0.230 | 0.208 | 0.084 | 0.072 | 0.122 | 0.100 | 0.125 | ||||
| 24 | 0.3720 | 0.562 | 0.551 | 0.614 | - | - | - | 0.295 | 0.270 | 0.094 | 0.081 | 0.156 | 0.131 | 0.162 | ||||
| 3/8 | 0.3750 | 0.562 | 0.551 | 0.614 | - | - | - | 0.295 | 0.270 | 0.094 | 0.081 | 0.156 | 0.131 | 0.162 | ||||
| 7/16 | 0.4375 | 0.625 | 0.610 | 0.682 | - | - | - | 0.348 | 0.321 | - | - | - | - | 0.193 | ||||
| 1/2 | 0.5000 | 0.750 | 0.735 | 0.820 | - | - | - | 0.400 | 0.367 | - | - | - | - | 0.220 | ||||