Table 5. British Standard Machine Screws and Nuts.—Metric Series BS 4183:1967 (obsolescent) Concentricity Tolerances Nominal Lengths and Tolerances on Length for Machine Screws
Dimensions of Machine Screw Nuts, Pressed Type, Square and Hexagon
Nominal Length a Tolerance Nominal Length a Tolerance
Width Across
IT 13
IT 13
Nominal Size d a
Flats s
Corners e Square
1.5
45 50 55 60 65 70 75 80 85 90
± 0.12 ± 0.12 ± 0.20 ± 0.20 ± 0.24 ± 0.24 ± 0.24 ± 0.29 ± 0.29 ± 0.29 ± 0.29 ± 0.35 ± 0.35 ± 0.35 ± 0.35 ± 0.35 ± 0.42 ± 0.42 ± 0.42 ± 0.42 ± 0.42 ± 0.50 ± 0.50
± 0.50 ± 0.060 ± 0.60 ± 0.60 ± 0.60 ± 0.60 ± 0.60 ± 0.60 ± 0.70 ± 0.70 ± 0.70 ± 0.70 ± 0.70 ± 0.70 ± 0.70 ± 0.70 ± 0.70 ± 0.80 ± 0.80 ± 0.80 ± 0.80 ± 0.925 ± 0.925
Max.
Min. 3.02 3.82 4.32 4.82 5.32 5.82 6.78 7.78 9.78 12.73 16.73
2
Countersunk & Raised Countersunk Heads Pan & Cheese Heads
2.5
M1.6
3.2 4.0 4.5 5.0 5.5 6.0 7.0 8.0
4.5 5.7 6.4 7.1 7.8 8.5 9.9
3 4 5 6
M2
(M2.2) (M2.5)
M3
(7)
(M3.5)
8
M4 M5 M6 M8
Slot to Head
Head to Shank
(9) 10 12 14 16 (11) (18)
11.3 14.1 18.4 24.0
(95) 100 (105) (115) 120 (125) 110
10.0 13.0 17.0
M10
Head to Shank and Slot to Head (IT 13)
Nominal Size d a
Width Across Corners e Hexagon
Countersunk, Raised Csk., and Pan Heads
Thickness m
Nominal Size d a
Cheese Heads
M1, M1.2, (M1.4)
0.14 0.18 0.18 0.22 0.22 0.27 0.27 0.33 0.33 0.39
0.14 0.14 0.18 0.18 0.22 0.22 0.27 0.27 0.33 0.33
20
Max.
Min 0.75 0.95 0.95 1.35 1.35 1.75 1.75 2.25 2.75 3.70 4.70 18.4 24.0
M1.6
(22)
130 140 150 160 190 200
M1.6
3.7 4.6 5.2 5.8 6.4 6.9 8.1 9.2
1.0 1.2 1.2 1.6 1.6 2.0 2.0 2.5 3.0 4.0 5.0
25
M2
M2, (M2.2), M2.5, M3
(M3.5)
(28)
(M2.2) M2.5
30
M4, (M4.5), M5
M6 M8
(38)
M3
40
(M3.5)
M10, M12
M4 M5 M6 M8
(M14)
M16, (M18), M20
11.5 15.0 19.6 13.0 17.0
M10 M8 M10
12.73 16.73
a Nominal sizes and lengths shown in parentheses are non-preferred. All dimensions are given in millimeters. For dimensional notation, see diagram on page 1804.
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