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| Nominal Size or Basic Screw Diameter | Machine Screw Length L | Type A & AB Tapping Screws | Other Types of Tapping Screws | Head Diameter, A | Head Height, H.Ref | Slot Width, J | Slot Depth, T | Protrusion Above Gaging Diameter, F | Gaging Diameter, G | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | ||||||
| 0.0000 | – | – | – | 0.040 | 0.035 | 0.011 | 0.008 | 0.004 | 0.007 | 0.003 | – | – | – |
| 0.000 | – | – | – | 0.060 | 0.055 | 0.016 | 0.011 | 0.007 | 0.009 | 0.005 | – | – | – |
| 0.00 | – | – | – | 0.087 | 0.080 | 0.028 | 0.017 | 0.010 | 0.014 | 0.009 | – | – | – |
| 0 | 1/8 | 3/16 | 1/8 | 0.112 | 0.096 | 0.035 | 0.023 | 0.016 | 0.015 | 0.010 | 0.026 | 0.016 | 0.078 |
| 1 | 1/8 | 3/16 | 5/32 | 0.137 | 0.120 | 0.043 | 0.026 | 0.019 | 0.019 | 0.012 | 0.028 | 0.016 | 0.101 |
| 2 | 1/8 | 3/16 | 3/16 | 0.162 | 0.144 | 0.051 | 0.031 | 0.023 | 0.023 | 0.015 | 0.029 | 0.017 | 0.124 |
| 3 | 1/8 | 7/32 | 7/32 | 0.187 | 0.167 | 0.059 | 0.035 | 0.027 | 0.027 | 0.017 | 0.031 | 0.018 | 0.148 |
| 4 | 3/16 | 1/4 | 1/4 | 0.212 | 0.191 | 0.067 | 0.039 | 0.031 | 0.030 | 0.020 | 0.032 | 0.019 | 0.172 |
| 5 | 3/16 | 1/4 | 1/4 | 0.237 | 0.215 | 0.075 | 0.043 | 0.035 | 0.034 | 0.022 | 0.034 | 0.020 | 0.196 |
| 6 | 3/16 | 5/16 | 5/16 | 0.262 | 0.238 | 0.083 | 0.048 | 0.039 | 0.038 | 0.024 | 0.036 | 0.021 | 0.220 |
| 7 | – | 3/8 | 3/8 | 0.287 | 0.262 | 0.091 | 0.048 | 0.039 | 0.041 | 0.027 | 0.037 | 0.022 | 0.243 |
| 8 | 1/4 | 7/16 | 7/16 | 0.312 | 0.285 | 0.100 | 0.054 | 0.045 | 0.045 | 0.029 | 0.039 | 0.023 | 0.267 |
| 10 | 5/16 | 1/2 | 1/2 | 0.362 | 0.333 | 0.116 | 0.060 | 0.050 | 0.053 | 0.034 | 0.042 | 0.025 | 0.313 |
| 12 | 3/8 | 9/16 | 9/16 | 0.412 | 0.380 | 0.132 | 0.067 | 0.056 | 0.060 | 0.039 | 0.045 | 0.027 | 0.362 |
| 14 | – | 5/8 | – | 0.462 | 0.427 | 0.148 | 0.075 | 0.064 | 0.068 | 0.044 | 0.049 | 0.029 | 0.410 |
| 1/4 | 7/16 | 5/8 | 5/8 | 0.477 | 0.442 | 0.153 | 0.075 | 0.064 | 0.070 | 0.046 | 0.050 | 0.029 | 0.424 |
| 16 | – | 3/4 | – | 0.512 | 0.475 | 0.164 | 0.075 | 0.064 | 0.075 | 0.049 | 0.052 | 0.031 | 0.457 |
| 18 | – | 13/16 | – | 0.561 | 0.522 | 0.180 | 0.084 | 0.072 | 0.083 | 0.054 | 0.055 | 0.033 | 0.505 |
| 5/16 | 1/2 | 13/16 | 5/8 | 0.597 | 0.556 | 0.191 | 0.084 | 0.072 | 0.088 | 0.058 | 0.057 | 0.034 | 0.539 |
| 20 | – | 13/16 | – | 0.611 | 0.569 | 0.196 | 0.084 | 0.072 | 0.090 | 0.059 | 0.058 | 0.035 | 0.553 |
| 24 | – | 1 | – | 0.711 | 0.664 | 0.228 | 0.094 | 0.081 | 0.105 | 0.069 | 0.065 | 0.039 | 0.648 |
| 3/8 | 9/16 | – | 5/8 | 0.717 | 0.670 | 0.230 | 0.094 | 0.081 | 0.106 | 0.070 | 0.065 | 0.039 | 0.653 |
| 7/16 | 5/8 | – | 3/4 | 0.760 | 0.715 | 0.223 | 0.094 | 0.081 | 0.103 | 0.066 | 0.073 | 0.044 | 0.690 |
| 1/2 | 3/4 | – | 3/4 | 0.815 | 0.765 | 0.223 | 0.106 | 0.091 | 0.103 | 0.065 | 0.081 | 0.049 | 0.739 |
| 9/16 | – | – | – | 0.932 | 0.878 | 0.260 | 0.118 | 0.102 | 0.120 | 0.077 | 0.089 | 0.053 | 0.851 |
| 5/8 | – | – | – | 1.050 | 0.990 | 0.298 | 0.133 | 0.116 | 0.137 | 0.088 | 0.097 | 0.058 | 0.962 |
| 3/4 | – | – | – | 1.285 | 1.215 | 0.372 | 0.149 | 0.131 | 0.171 | 0.111 | 0.112 | 0.067 | 1.186 |