Machinery's Handbook, 31st Edition
1830
Socket Screws Table 4. British Standard Hexagon Socket Countersunk and Button Head Screws.—Metric Series BS 4168:1967
Theoretical Sharp Theoretical Minimum
A A
Length L
F H 45°
J
92° 90°
D
Alternative Design Socket
K
K
COUNTERSUNK HEAD SCREWS
Hexagon Socket Size, J
Key Engage ment, K
Body Diameter, D
Head Diameter, A
Head Height, H
Fillet Radius, F
Theor. Sharp Max. 6.72 8.96 11.20 13.44 17.92 22.40 26.88 30.24 33.60 36.96 40.32
Nom. Size
Absolute Min.
Flushness Tolerance
Max.
Min.
Ref.
Nom.
Min. 1.05 1.49 1.86 2.16 2.85 3.60 4.35 4.65 4.89 5.25 5.45
Max. 0.40 0.40 0.40 0.60 0.70 0.80 1.10 1.10 1.10 1.10 1.10
M3 M4 M5 M6 M8
3.00 4.00 5.00 6.00
2.86 3.82 4.82 5.82 7.78 9.78
5.82 7.78 9.78
1.86 2.48 3.10 3.72 4.96 6.20 7.44 8.12 8.80 9.48
0.20 0.20 0.20 0.20 0.24 0.30 0.36 0.40 0.45 0.50 0.54
2.00 2.50 3.00 4.00 5.00 6.00 8.00
11.73 15.73 19.67 23.67 26.67 29.67 32.61 35.61
8.00 10.00
M10 M12
12.00 11.73 14.00 13.73 16.00 15.73 18.00 17.73 20.00 19.67
(M14)
10.00 10.00 12.00 12.00
M16
(M18)
M20
10.16
D 45°
Length L
H
J
S
Alternative Socket Design
d a
A
F
K
K
BUTTON HEAD SCREWS
Head Side Height, S
Hexagon Socket Size, J
Key Engage ment, K
Head Diameter, A
Head Height, H
Fillet Radius F d a
Nom. Size, D
Max.
Min.
Max. 1.60 2.10 2.70 3.20 4.30 5.30 6.40
Min. 1.40 1.85 2.45 2.95 3.95 4.95 5.90
Ref. 0.38 0.38 0.50 0.80 0.80 0.80 0.80
Nom.
Min. 1.04 1.30 1.56 2.08 2.60 3.12 4.16
Min. 0.10 0.20 0.20 0.25 0.40 0.40 0.60
Max.
M3 M4 M5 M6 M8
5.50 7.50 9.50
5.32 7.28 9.28
2.00 2.50 3.00 4.00 5.00 6.00 8.00
3.60 4.70 5.70 6.80
10.50 14.00 18.00 21.00
10.23 13.73 17.73 20.67
9.20 11.20 14.20
M10 M12
All dimensions are given in millimeters.
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