Table 4. British Standard ISO Metric Precision Hexagon Bolts and Screws BS 3692:1967 (obsolescent)
Nom.Size and Thread Dia. a d
Eccentric ity of Head
Eccentricity of Shank and Split Pin Hole to the Thread
Radius Under Head b r
Height of Head k
Dia. of Unthreaded Shank d
Width Across Flats s
Width Across Corners e
Dia. of Washer Face d t
Depth of Washer Face c
Pitch of Thread (Coarse PitchSeries)
Transition Dia. b d a
Thread Runout a
Max.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Max.
Min.
Max.
Min.
Max.
Max. 0.14 0.14 0.14 0.14 0.18 0.18 0.18 0.22 0.22 0.27 0.27 0.27 0.27 0.33 0.33 0.33 0.33 0.33 0.39 0.39 0.39 0.39 0.39 0.39 0.46 0.46 0.46 0.46 0.46
M1.6 M2 M2.5 M3
0.35 0.4 0.45 0.5
0.8 1.0 1.0 1.2 1.6 2.0 2.5 3.0 3.5 4.0 5.0 5.0 6.0 6.0 6.0 7.0 7.0 8.0 8.0
1.6 1.46 3.2 2.0 1.86 4.0 2.5 2.36 5.0 3.0 2.86 5.5 4.0 3.82 7.0 5.0 4.82 8.0 6.0 5.82 10.0
3.08 3.7 3.48 … … … 2.0 3.88 4.6 4.38 … … … 2.6 4.88 5.8 5.51 … … … 3.1
0.2 0.3 0.3 0.3
0.1 1.225 0.975 0.18 0.1 1.525 1.275 0.18 0.1 2.125 1.875 0.18 0.1 2.125 1.875 0.18
5.38 6.4 6.08 5.08 4.83 6.85 8.1 7.74 6.55 6.30 7.85 9.2 8.87 7.55 7.30 9.78 11.5 11.05 9.48 9.23
0.1 0.1 0.2 0.3 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.6
3.6 4.7 5.7 6.8
M4 M5 M6 M8
0.7 0.8
0.35 0.2 2.925 2.675 0.22
0.35 0.2 3.650 3.35 0.4 0.25 4.15 3.85
0.22 0.22 0.27 0.27 0.33 0.33 0.33
1
1.25 1.5 1.75
8.0 7.78 13.0 12.73 15.0 14.38 12.43 12.18 10.0 9.78 17.0 16.73 19.6 18.90 16.43 16.18 12.0 11.73 19.0 18.67 21.9 21.10 18.37 18.12 14.0 13.73 22.0 21.67 25.4 24.49 21.37 21.12 16.0 15.73 24.0 23.67 27.7 26.75 23.27 23.02 18.0 17.73 27.0 26.67 31.2 30.14 26.27 26.02 20.0 19.67 30.0 29.67 34.6 33.53 29.27 28.80 22.0 21.67 32.0 31.61 36.9 35.72 31.21 30.74 24.0 23.67 36.0 35.38 41.6 39.98 34.98 34.51 27.0 26.67 41.0 40.38 47.3 45.63 39.98 39.36 30.0 29.67 46.0 45.38 53.1 51.28 44.98 44.36 33.0 32.61 50.0 49.38 57.7 55.80 48.98 48.36 36.0 35.61 55.0 54.26 63.5 61.31 53.86 53.24 39.0 38.61 60.0 59.26 69.3 66.96 58.86 58.24 42.0 41.61 65.0 64.26 75.1 72.61 63.76 63.04 45.0 44.61 70.0 69.26 80.8 78.26 68.76 68.04 48.0 47.61 75.0 74.26 86.6 83.91 73.76 73.04
9.2 11.2 14.2 16.2 18.2 20.2 22.4 24.4 26.4 30.4 33.4 36.4 39.4 42.4 45.6 48.6 52.6
0.6 0.6 1.1 1.1 1.1 1.1 1.2 1.2 1.2 1.7 1.7 1.7 1.7 1.7 1.8 1.8 2.3 2.3 3.5 3.5 3.5 3.5
0.4 5.65 5.35 0.4 7.18 6.82 0.6 8.18 7.82 0.6 9.18 8.82 0.6 10.18 9.82
M10 M12 (M14) M16 (M18) M20 (M22) M24 (M27) M30 (M33) M36 (M39) M42 (M45) M48 (M52) M56 (M60) M64 (M68)
2 2
2.5 2.5 2.5
0.6 12.215 11.785 0.33 0.8 13.215 12.785 0.33 0.8 14.215 13.785 0.39 0.8 15.215 14.785 0.39 1.0 17.215 16.785 0.39
3 3
3.5 3.5
1.0 19.26 18.74 1.0 21.26 20.74 1.0 23.26 22.74 1.0 25.26 24.74 1.2 26.26 25.74 1.2 28.26 27.74 1.6 30.26 29.74 1.6 33.31 32.69 2.0 35.31 34.69 2.0 38.31 37.69 2.0 40.31 39.69 2.0 43.31 42.69
0.39 0.39 0.46 0.46 0.46 0.46 0.46 0.46 0.54 0.54 0.54 0.54
4 4
10.0 10.0 11.0 11.0 12.0 12.0 19.0 19.0 21.0 21.0
4.5 4.5
5 5
52.0 51.54 80.0 79.26 92.4 89.56 … … … 56.6 56.0 55.54 85.0 84.13 98.1 95.07 … … … 63.0 60.0 59.54 90.0 89.13 103.9 100.72 … … … 67.0 64.0 63.54 95.0 94.13 109.7 106.37 … … … 71.0 68.0 67.54 100.0 99.13 115.5 112.02 … … … 75.0
5.5 5.5
6 6
a Sizes shown in parentheses are non-preferred. b A true radius is not essential provided that the curve is smooth and lies wholly within the maximum radius, determined from the maximum transitional diameter, and the minimum radius specified. All dimensions are in millimeters. For illustration of bolts and screws see Table 3.
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