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Undercut Flat Heads
Undercut Flat Heads
Nominal Size |
L |
A |
H |
J |
T |
M |
R |
N |
F |
G |
Phillips Driver Size |
These Lengths or Shorter are Undercut |
Head Dimensions |
Slot Dimensions |
Recess Dimensions |
Protrusion Above Gaging Diameter |
Gaging Diameter |
Diameter |
Height |
Width |
Depth |
Diam. |
Depth |
Width |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Ref |
Ref |
Ref |
Max |
Min |
0 |
1/8 |
.112 |
.096 |
.025 |
.018 |
.023 |
.016 |
.011 |
.007 |
.062 |
.035 |
.014 |
- |
- |
- |
0 |
1 |
1/8 |
.137 |
.120 |
.031 |
.023 |
.026 |
.019 |
.014 |
.009 |
.070 |
.043 |
.015 |
- |
- |
- |
0 |
2 |
1/8 |
.162 |
.144 |
.036 |
.028 |
.031 |
.023 |
.016 |
.011 |
.088 |
.048 |
.017 |
.029 |
.017 |
.124 |
1 |
4 |
3/16 |
.212 |
.191 |
.047 |
.038 |
.039 |
.031 |
.022 |
.014 |
.110 |
.070 |
.018 |
.032 |
.019 |
.172 |
1 |
5 |
3/16 |
.237 |
.215 |
.053 |
.043 |
.043 |
.035 |
.024 |
.016 |
.122 |
.081 |
.018 |
.034 |
.020 |
.196 |
1 |
6 |
3/16 |
.262 |
.238 |
.059 |
.048 |
.048 |
.039 |
.027 |
.017 |
.140 |
.066 |
.025 |
.036 |
.021 |
.220 |
2 |
8 |
1/4 |
.312 |
.285 |
.070 |
.058 |
.054 |
.045 |
.032 |
.021 |
.168 |
.094 |
.029 |
.039 |
.023 |
.267 |
2 |
10 |
5/16 |
.362 |
.333 |
.081 |
.068 |
.060 |
.050 |
.037 |
.024 |
.182 |
.110 |
.030 |
.042 |
.025 |
.313 |
2 |
12 |
3/8 |
.412 |
.380 |
.092 |
.078 |
.067 |
.056 |
.043 |
.028 |
.226 |
.110 |
.030 |
.045 |
.027 |
.362 |
3 |
1/4 |
7/16 |
.477 |
.442 |
.107 |
.092 |
.075 |
.064 |
.050 |
.032 |
.244 |
.124 |
.032 |
.050 |
.029 |
.424 |
3 |
5/16 |
1/2 |
.597 |
.556 |
.134 |
.116 |
.084 |
.072 |
.062 |
.041 |
.310 |
.157 |
.053 |
.057 |
.034 |
.539 |
4 |
3/8 |
9/16 |
.717 |
.670 |
.161 |
.140 |
.094 |
.081 |
.075 |
.049 |
.358 |
.205 |
.061 |
.065 |
.039 |
.653 |
4 |
1/2 |
3/4 |
.815 |
.765 |
.156 |
.130 |
.106 |
.091 |
.072 |
.046 |
.402 |
.252 |
.068 |
.081 |
.049 |
.739 |
4 |