|
Round Heads for Machine Screws ANSI/ASME B18.6.3 1972 | |||||||||||||
|
Nominal Size |
Head Dimensions |
Slot Dimensions |
Recess Dimensions |
Driver Size | |||||||||
Diameter(A) |
Height of Head(H)
|
Width(J) |
Depth(T) |
Dia.(M) |
Depth(G) |
Width(N) | |||||||
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min | ||
|
2 |
.162 |
.146 |
.069 |
.059 |
.031 |
.023 |
.048 |
.037 |
.100 |
.087 |
.053 |
.017 |
1 |
|
3 |
.187 |
.169 |
.078 |
.067 |
.035 |
.027 |
.053 |
.040 |
.109 |
.096 |
.062 |
.018 |
1 |
|
4 |
.211 |
.193 |
.086 |
.075 |
.039 |
.031 |
.058 |
.044 |
.118 |
.105 |
.072 |
.019 |
1 |
|
5 |
.236 |
.217 |
.095 |
.083 |
.043 |
.035 |
.063 |
.047 |
.154 |
.141 |
.074 |
.027 |
2 |
|
6 |
.260 |
.240 |
.103 |
.091 |
.048 |
.039 |
.068 |
.051 |
.162 |
.149 |
.084 |
.027 |
2 |
|
8 |
.309 |
.287 |
.120 |
.107 |
.054 |
.045 |
.077 |
.058 |
.178 |
.165 |
.101 |
.030 |
2 |
|
10 |
.359 |
.334 |
.137 |
.123 |
.060 |
.050 |
.087 |
.065 |
.195 |
.182 |
.119 |
.031 |
2 |
|
12 |
.408 |
.382 |
.153 |
.139 |
.067 |
.056 |
.096 |
.073 |
.249 |
.236 |
.125 |
.032 |
3 |
|
1/4 |
.472 |
.443 |
.175 |
.160 |
.075 |
.064 |
.109 |
.082 |
.268 |
.255 |
.147 |
.034 |
3 |
|
5/16 |
.590 |
.557 |
.216 |
.198 |
.084 |
.072 |
.132 |
.099 |
.308 |
.295 |
.187 |
.040 |
3 |
|
3/8 |
.708 |
.670 |
.256 |
.237 |
.094 |
.081 |
.155 |
.117 |
.387 |
.374 |
.228 |
.064 |
4 |
|
1/2 |
.813 |
.766 |
.355 |
.332 |
.106 |
.091 |
.211 |
.159 |
.416 |
.403 |
.256 |
.068 |
4 |
