
Dimensions of Slotted Flat Countersunk Head Wood Screws
| Nominal Size or Basic Screw Diameter |
A | H | J | T | R | |||
| Head Diameter | Head Height | Slot Width | Slot Depth | Fillet Radius | ||||
| Max, Edge Sharp | Min, Edge Rounded or Flat | |||||||
| Ref | Max | Min | Max | Min | Max | |||
| 0 (0.060) | 0.119 | 0.099 | 0.035 | 0.023 | 0.016 | 0.015 | 0.010 | 0.031 |
| 1 (0.073) | 0.146 | 0.123 | 0.043 | 0.026 | 0.019 | 0.019 | 0.012 | 0.031 |
| 2 (0.086) | 0.172 | 0.147 | 0.051 | 0.031 | 0.023 | 0.023 | 0.015 | 0.031 |
| 3 (0.099) | 0.199 | 0.171 | 0.059 | 0.035 | 0.027 | 0.027 | 0.017 | 0.031 |
| 4 (0.112) | 0.225 | 0.195 | 0.067 | 0.039 | 0.031 | 0.030 | 0.020 | 0.031 |
| 5 (0.125) | 0.252 | 0.220 | 0.075 | 0.043 | 0.035 | 0.034 | 0.022 | 0.062 |
| 6 (0.138) | 0.279 | 0.244 | 0.083 | 0.048 | 0.039 | 0.038 | 0.024 | 0.062 |
| 7 (0.151) | 0.305 | 0.268 | 0.091 | 0.048 | 0.039 | 0.041 | 0.027 | 0.062 |
| 8 (0.164) | 0.332 | 0.292 | 0.100 | 0.054 | 0.045 | 0.045 | 0.029 | 0.062 |
| 9 (0.177) | 0.358 | 0.316 | 0.108 | 0.054 | 0.045 | 0.049 | 0.032 | 0.062 |
| 10 (0.190) | 0.385 | 0.340 | 0.116 | 0.060 | 0.050 | 0.053 | 0.034 | 0.062 |
| 12 (0.216) | 0.438 | 0.389 | 0.132 | 0.067 | 0.056 | 0.060 | 0.039 | 0.062 |
| 14 (0.242) | 0.507 | 0.452 | 0.153 | 0.075 | 0.064 | 0.070 | 0.046 | 0.093 |
| 16 (0.268) | 0.544 | 0.485 | 0.164 | 0.075 | 0.064 | 0.075 | 0.049 | 0.093 |
| 18 (0.294) | 0.635 | 0.568 | 0.191 | 0.084 | 0.072 | 0.083 | 0.054 | 0.093 |
| 20 (0.320) | 0.650 | 0.582 | 0.196 | 0.084 | 0.072 | 0.090 | 0.059 | 0.093 |
| 24 (0.372) | 0.762 | 0.685 | 0.230 | 0.094 | 0.081 | 0.106 | 0.070 | 0.093 |