Table 3. British Standard Hexagon Socket Set Screws.—Metric Series BS 4168:Parts 2, 3, 4, and 5:1994
Range of Popular Lengths
Length of Dog on Dog Point Screws b
End Diameters
Depth of Key Engagement, t a
Flat Point, d z
Cone Point d t
Dog Point, d p
Cup Point, d z
Socket Size, s
Flat Point
Cone Point
Dog Point
Cup Point
Short Dog, z
Long Dog, z
Nom. Size, d
Pitch, P
Nom. Min.
Min.
Min.
Max.
Min.
Max.
Max. Max. Max. Max.
* b
l
l
l
l
M1.6 0.35 0.7 0.7 1.5 2-8 2-8 2-8 2-8
0.4
0.65 0.8 0.75 1.0
1.05 2.5 0.8 0 1.25 3.0 1.0 0
0.8 0.8 1.0 1.0 1.5 1.2 2.0 1.4 2.5 2.0 3.5 2.5
M2
0.4 0.9 0.8 1.7 2-10 2-10 2.5-10 2-10 0.5
M2.5 0.45 1.3 1.2 2.0 2-12 2.5-12 3-12 2-12 0.63 0.88 1.25 1.5 4
1.5 0 2.0 0 2.5 0 3.5 0
M3 M4 M5 M6 M8
0.5 1.5 1.2 2.0 2-16 2.5-16 4-16 2.5-16 0.75 1.0
1.5
1.75 5 2.25 6 2.75 6 3.25 8 4.3 10 5.3 12 6.3 16 8.36 20
0.7 2.0 1.5 2.5 2.5-20 3-20 5-20 3-20 1.0
1.25 2.0
0.8 2.5 2.0 3.0 3-25 4-25 6-25 4-25 1.25 1.5
2.5
1.0 3.0 2.0 3.5 4-30 5-30 8-30 5-30 1.5 1.25 4.0 3.0 5.0 5-40 6-40 8-40 6-40 2.0
1.75 3.0 2.25 4.0 2.75 5.0 3.25 6.0
4.0 1.5 4.0 3.0 5.5 2.0 5.5 5.0 7.0 2.5 7.0 6.0 8.5 3.0 8.5 8.0 12.0 4.0 12.0 10.0 15.0 5.0 15.0 14.0
M10 1.5 5.0 4.0 6.0 6-50 8-50 10-50 8-50 2.5 M12 1.75 6.0 4.8 8.0 8-60 10-60 12-60 10-60 3.0 M16 2.0 8.0 6.4 10.0 10-60 12-60 16-60 12-60 4.0 M20 2.5 10.0 8.0 12.0 12-60 16-60 20-60 16-60 5.0
4.3
8.0
5.3 10.0 10.36 25 6.3 12.0 12.43 30
M24 3.0 12.0 10.0 15.0 16-60 20-60 25-60 20-60 6.0 18.0 6.0 18.0 16.0 a The smaller of the two t min. values applies to certain short-length set screws. These short-length screws are those whose length is approximately equal to the diameter of the screw. The larger t min. values apply to longer-length screws. b A dog point set screw having a nominal length equal to or less than the length shown in the (*) column of the table is supplied with length z shown in the short dog column. For set screws of lengths greater than shown in the (*) column, z for long dogs applies. All dimensions are in millimeters. For dimensional notation, see diagram, page 1831.
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