Table 1. British Standard Slotted Countersunk Head Machine Screws—Metric Series BS 4183:1967 (obsolescent)
Head Diameter D
Head Height k
Thread Length b
Thread Run-out a
Flushness Tolerance c
Slot Width n
Slot Depth t
Nominal Size d a
Radius r b
Max. (Theor. Sharp) 2d
Min. 1.75 d
Max. 0.5 d
Min. 0.45 d
Max. 0.3 d 0.30 0.36 0.42 0.48 0.60 0.66 0.75 0.90 1.05 1.20 1.35 1.50 1.80 2.40 3.00 3.60 4.20 4.80 5.40 6.00
Min. 0.2 d 0.20 0.24 0.28 0.32 0.40 0.44 0.50 0.60 0.70 0.80 0.90 1.00 1.20 1.60 2.00 2.40 2.80 3.20 3.60 4.00
Max. 2 p d 0.50 0.50 0.60 0.70 0.80 0.90 0.90 1.00 1.20 1.40 1.50 1.60 2.00 2.50 3.00 3.50 4.00 4.00 5.00 5.00
Max.
Max.
Min.
Min.
… 0.45 … 0.50 … 0.50 … 0.60 … 0.70 … 0.80
0.31 0.36 0.36 0.46 0.56 0.66 0.66 0.86 0.86 1.06 1.06 1.26 1.66 2.06 2.56 3.06 3.06 4.07 4.07 5.07
M1
2.00 2.40 2.80 3.20 4.00 4.40 5.00 6.00 7.00 8.00 9.00
1.75 2.10 2.45 2.80 3.50 3.85 4.38 5.25 6.10 7.00 7.85 8.75
0.50 0.60 0.70 0.80 1.00 1.10 1.25 1.50 1.75 2.00 2.25 2.50 3.00 4.00 5.00 6.00 7.00 8.00 9.00
0.45 0.54 0.63 0.72 0.90 0.99 1.12 1.35 1.57 1.80 2.03 2.25 2.70 3.60 4.50 5.40 6.30 7.20 8.10 9.00
0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.2 0.4 0.4 0.6 0.6 0.6 0.6 0.8
e e e
M1.2
(M1.4)
M1.6 M2.0
15.0 16.0 17.0 18.0 19.0 20.0 22.0 24.0 25.0 28.0 34.0 40.0 46.0 52.0 58.0 64.0 70.0
(M2.2) M2.5
0.10 0.12 0.13 0.15 0.17 0.19 0.23 0.29 0.37 0.44 0.52 0.60 0.67 0.75
0.80 1.00 1.00 1.20 1.20 1.51 1.91 2.31 2.81 3.31 3.31 4.37 4.37 5.37
M3
(M3.5)
M4
(M4.5)
M5 M6 M8
10.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00
10.50 14.00 17.50 21.00 24.50 28.00 31.50 35.00
0.25
M10 M12
(M14) M16 (M18) M20
10.00
a Nominal sizes shown in parentheses are non-preferred. b See Radius Under the Head of Screws description in text.
c See Dimensions of 90-Degree Countersunk Head Screws description in text. d See text following table in Lengths of Thread on Screws description in text. e Threaded up to head. All dimensions are given in millimeters. For dimensional notation, see diagram on page 1804 . Recessed head screws are also standard and are available. For dimensions see British Standard.
Made with FlippingBook - Share PDF online