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Machine Screw Head Dimensions


Oval Head

Fully specified as "oval countersunk", this head is identical to the standard flat head, but posesses, in addition, a rounded, top surface for attractiveness of design.
This table references ANSI B18.6.3

Screw Head Screw Head


Nominal
Size
A
H
O
J
T
M
G
N
Phillips
Driver
Size
Head Diameter
Head Height
Slot Dimensions
Recess Dimensions
Side
Total
Width
Depth
Dia
Depth
Width
Max
Min
Max
Max
Max
Min
Max
Min
Ref
Ref
Ref
0
.112
.096
.035
.056
.023
.016
.030
.025
.068
.036
.014
0
1
.137
.120
.043
.068
.026
.019
.038
.031
.070
.039
.015
0
2
.162
.144
.051
.08
.031
.023
.045
.037
.106
.060
.018
1
3
.187
.167
.059
.092
.035
.027
.052
.043
.118
.072
.019
1
4
.212
.191
.067
.104
.039
.031
.059
.049
.130
.086
.019
1
5
.237
.215
.075
.116
.043
.035
.076
.055
.152
.073
.028
2
6
.262
.238
.083
.128
.048
.039
.074
.060
.172
.092
.030
2
8
.312
.285
.100
.152
.054
.045
.088
.072
.186
.107
.031
2
10
.362
.333
.116
.176
.060
.050
.103
.084
.202
.125
.033
2
12
.412
.380
.132
.200
.067
.056
.117
.096
.264
.140
.038
3
1/4
.477
.442
.153
.232
.075
.064
.136
.112
.284
.160
.040
3
5/16
.597
.556
.191
.290
.084
.072
.171
.141
.384
.226
.065
4
3/8
.717
.670
.230
.347
.094
.081
.206
.170
.404
.245
.068
4
7/16
.760
.715
.223
.345
.094
.081
.210
.174
.416
.257
.070
4
1/2
.815
.765
.223
.354
.106
.091
.216
.176
.430
.271
.071
4


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