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Flat Head Undercut

Similar to that of the 82 degree Head except the head is undercut to 70% of its normal side height. This is standard for shorter lengths because it allows for more threads. Also, it avoids transition fillet and assembly interference.


Nominal
Size
L A H J T M G N Phillips
Driver
Size
These
Lengths or Shorter
are
Undercut
Head Diameter Height of
Head
Width
Of
Slot
Depth of
Slot
Dimensions of Recess
Max.
Edge
Sharp
Min..
Edge
Rounded
or Flat
Diameter Depth Width
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Min.
4
6
8
10
12
1/4
5/16
3/8
3/16
3/16
1/4
5/16
3/8
7/16
1/2
9/16
0.225
0.279
0.332
0.385
0.438
0.507
0.635
0.762
0.195
0.244
0.292
0.340
0.389
0.452
0.568
0.685
0.047
0.059
0.070
0.081
0.092
0.107
0.134
0.161
0.038
0.048
0.058
0.068
0.078
0.092
0.116
0.140
0.039
0.048
0.054
0.060
0.067
0.075
0.084
0.094
0.031
0.039
0.045
0.050
0.056
0.064
0.072
0.081
0.022
0.027
0.032
0.037
0.043
0.050
0.062
0.075
0.014
0.017
0.021
0.024
0.028
0.032
0.041
0.049
0.117
0.146
0.174
0.189
0.233
0.250
0.317
0.365
0.104
0.133
0.161
0.176
0.220
0.237
0.304
0.352
0.078
0.078
0.106
0.121
0.121
0.136
0.168
0.216
0.062
0.055
0.083
0.098
0.098
0.113
0.146
0.194
0.018
0.025
0.029
0.030
0.030
0.032
0.053
0.061
1
2
2
2
3
3
4
4
 

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Related Files:
Flat Undercut Product File
 
 
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