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BS 2470G-4-2017
BS hexagon socket button head screws-Table 4
Nom
P
dk max
dk min
k max
k min
s max
s min
e min
t min
r min
da max
1/4
20
0.437
0.419
0.132
0.122
0.1587
0.1562
0.178
0.087
0.015
0.29
5/16
18
0.547
0.527
0.166
0.152
0.19
0.1875
0.214
0.105
0.015
0.352
3/8
16
0.656
0.626
0.199
0.185
0.2217
0.2187
0.250
0.122
0.015
0.415
1/2
12
0.875
0.851
0.265
0.245
0.316
0.3125
0.357
0.175
0.02
0.56
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