BRITISH Machine Screws Machinery's Handbook, 31st Edition
1805
Table 3. British Standard Slotted Pan Head Machine Screws— Metric Series BS 4183:1967 (obsolescent)
Radius Under Head r
Head Diameter D
Head Height k
Head Radius R
Transition Diameter d a
Nominal Size d a
Max. 2 d
Max. 0.6 d Min.
Max 0.4 d 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.20 4.00
Min.
Min. 0.10 0.10 0.20 0.20 0.20 0.20 0.25 0.40 0.40
Max. 3.10 3.60 4.30 4.70 5.20 5.70 6.80 9.20 11.20
M2.5
5.00 4.70 1.50 1.36 6.00 5.70 1.80 1.66 7.00 6.64 2.10 1.96 8.00 7.64 2.40 2.26 9.00 8.64 2.70 2.56 10.00 9.64 3.00 2.86 12.00 11.57 3.60 3.42 16.00 15.57 4.80 4.62 20.00 19.48 6.00 5.82
M3
(M3.5)
M4
(M4.5)
M5 M6 M8
M10
a Nominal sizes shown in parentheses are non-preferred.
Thread Length b
Thread Run-out a
Slot Width n
Slot Depth t
Nominal Size d a
Max. 0.6 k 0.90 1.08 1.26 1.44 1.62 1.80 2.16 2.88 3.60
Max. 2 p b 0.90 1.00 1.20 1.40 1.50 1.60 2.00 2.50 3.00
Min. 0.4 k 0.60 0.72 0.84 0.96 1.08 1.20 1.44 1.92 2.40
Max. 0.80 1.00 1.00 1.20 1.20 1.51 1.91 2.31 2.81
Min. 0.66 0.86 0.86 1.06 1.06 1.26 1.66 2.06 2.56
Min. 18.00 19.00 20.00 22.00 24.00 25.00 28.00 34.00 40.00
M2.5
M3
(M3.5)
M4
(M4.5)
M5 M6 M8
M10
a Nominal sizes shown in parentheses are non-preferred. b See Lengths of Thread on Screws on page 1800.
All dimensions are in millimeters. For dimensional notation, see diagram on page 1804. Recessed head screws are also standard and available. For dimensions, see British Standard.
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