Dimension drawing
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BS 916-1953
Black hex head screws-forget
Nom
P
k max
k min
s max
s min
r max
1/4
20
0.186
0.166
0.445
0.435
0.03125
5/16
18
0.228
0.208
0.525
0.515
0.03125
3/8
16
0.27
0.25
0.6
0.585
0.03125
7/16
14
0.312
0.292
0.71
0.695
0.03125
1/2
12
0.363
0.333
0.82
0.8
0.03125
9/16
12
0.405
0.375
0.92
0.9
0.04688
5/8
11
0.447
0.417
1.01
0.985
0.04688
3/4
10
0.53
0.5
1.2
1.175
0.04688
7/8
9
0.623
0.583
1.3
1.27
0.0625
1
8
0.706
0.666
1.48
1.45
0.0625
1-1/8
7
0.79
0.75
1.67
1.64
0.125
1-1/4
7
0.89
0.83
1.86
1.815
0.125
1-3/8
8
0.98
0.92
2.05
2.005
0.125
1-1/2
6
1.06
1
2.22
2.175
0.125
1-5/8
5
1.18
1.08
2.41
2.365
0.125
1-3/4
5
1.27
1.17
2.58
2.52
0.125
2
4.5
1.43
1.33
2.76
2.7
0.125
2-1/4
4
1.6
1.5
3.15
3.09
0.1875
2-1/2
4
1.77
1.67
3.55
3.49
0.1875
2-3/4
3.5
1.93
1.83
3.89
3.83
0.1875
3
3.5
2.15
2
4.18
4.08
0.1875
3-1/4
3.25
2.32
2.17
4.53
4.43
0.25
3-1/2
3.25
2.48
2.33
4.85
4.75
0.25
3-3/4
3
2.65
2.5
5.18
5.08
0.25
4
3
2.82
2.67
5.55
5.45
0.25
4-1/2
2.875
3.2
3
6.38
6.255
0.25
5
2.75
3.53
3.33
7.3
7.175
0.25
5-1/2
2.625
3.87
3.67
8.35
8.225
0.25
6
2.5
4.2
4
9.45
9.325
0.25
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