ASME B18.6.3 Slotted Flat Countersunk Head Screws
Dimensions of ASME B18.6.3 Slotted Flat Countersunk Head Screws
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 |