Mutual Screw Head Dimensions And Drive Size Chart
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1Machine
Screws
Head Dimensions
82
Flat
º
Slotted5
Phillips
F
H
M
s
ASME
lat
eads For
acHine
crews
B18.6.3-2002
A
H
J
T
M
R
N
F
G
Head Dimensions
Slot Dimensions
Recess Dimensions
Phillips
Nominal
Protrusion Above
Driver
Size
Gaging Diameter
Gaging
Size
Diameter
Height
Width
Depth
Diam.
Depth
Width
Diameter
Max
Min
Max
Min
Max
Min
Max
Min
Ref
Ref
Ref
Max
Min
0
.112
.096
.035
.026
.023
.016
.015
.010
.062
.035
.014
.026
.016
.078
0
1
.137
.120
.043
.033
.026
.019
.019
.012
.070
.043
.015
.028
.016
.101
0
2
.162
.144
.051
.040
.031
.023
.023
.015
.096
.055
.017
.029
.017
.124
1
3
.187
.167
.059
.047
.035
.027
.027
.017
.100
.060
.018
.031
.018
.148
1
4
.212
.191
.067
.055
.039
.031
.030
.020
.122
.081
.018
.032
.019
.172
1
5
.237
.215
.075
.062
.043
.035
.034
.022
.148
.074
.027
.034
.020
.196
2
6
.262
.238
.083
.069
.048
.039
.038
.024
.168
.094
.029
.036
.021
.220
2
8
.312
.285
.100
.084
.054
.045
.045
.029
.182
.110
.030
.039
.023
.267
2
10
.362
.333
.116
.098
.060
.050
.053
.034
.198
.124
.032
.042
.025
.313
2
12
.412
.380
.132
.112
.067
.056
.060
.039
.262
.144
.035
.045
.027
.362
3
1/4
.477
.442
.153
.131
.075
.064
.070
.046
.276
.160
.036
.050
.029
.424
3
5/16
.597
.556
.191
.165
.084
.072
.088
.058
.358
.205
.061
.057
.034
.539
4
3/8
.717
.670
.230
.200
.094
.081
.106
.070
.386
.234
.065
.065
.039
.653
4
1/2
.815
.765
.223
.186
.106
.091
.103
.065
.418
.265
.069
.081
.049
.739
4
62
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