Table 1. British Standard Hexagon Socket Head Cap Screws—Metric Series BS 4168:Part 1:1981 (obsolescent)
K
Point Chamfered or for sizes M4 and below “As Rolled”
W
F
120° Min.
d D a
d
A
L s
2 P Max. Incomplete Thread
b (REF.)
L g
J
H
L
Fillet
Hexagon Socket Size, J b
Body Diameter, D
Head Diameter, A Max. d
Head Height, H
Key Engagement, K
Wall Thickness, W
Rad., F Min.
Dia., d a Max.
Nominal Size, a d
Max.
Min. 1.46 1.86 2.36 2.86 3.82 4.82 5.82 7.78 9.78 11.73 13.73 15.73 19.67 23.67 29.67 35.61
Max. c
Min. 2.86 3.62 4.32 5.32 6.78 8.28 9.78 12.73 15.73 17.73 20.67 23.67 29.67 35.61 44.61 53.54
Max.
Min. 1.46 1.86 2.36 2.86 3.82 4.82 5.70 7.64 9.64 11.57 13.57 15.57 19.48 23.48 29.48 35.38
Nom.
Min.
Min.
M1.6 M2 M2.5 M3
1.6 2.5 2 3 4
3
3.14 3.98 4.68 5.68 7.22 8.72 10.22 13.27 16.27 18.27 21.33 24.33 30.33 36.39 45.39 54.46
1.6 2.5 2 3 4
1.5 1.5 2.5 2 3 4
0.7 1.1 1.3 1 2.5
0.55 0.55 0.85 1.15
0.1 0.1 0.1 0.1
2
3.8 4.5 5.5 8.5 7
2.6 3.1 3.6 4.7
M4 M5 M6 M8
2 3 4 5 6 7 8
1.4 1.9 2.3 3.3 4.8 5.8 6.8 8.6 4
0.2 0.2 0.25 0.4
5 6 8
5 6 8
5.7 6.8 9.2 11.2 14.2 16.2 18.2 22.4 26.4 33.4 39.4
10 13 16 18 21 24 30 36 45 54
5 6 8
M10 M12 (M14) M16
10 12 14 16 20 24 30 36
10 12 14 16 20 24 30 36
0.4 0.6 0.6 0.6 0.8 0.8
10 12 14 17. 19 22 27
M20 M24 M30 M36
10 12 19 15.5
10.4 13.1 15.3
1 1
a The size shown in ( ) is non-preferred. b See Table 2 for min/max. c For plain heads. d For knurled heads. All dimensions are given in millimeters.
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