Table 6. British Standard ISO Metric Precision Hexagon Slotted Nuts and Castle Nuts BS 3692:1967 (obsolescent) Nominal Size and Thread Diameter a d Width Across Flats s Width Across Corners e Diameter d 2 Thickness h Lower Face of Nut to Bottom of Slot m Width of Slot n Radius (0.25 n ) r
Eccentricity of the Slots
Max. 7.00 8.00 10.00 13.00 17.00 19.00 22.00 24.00 27.00 30.00 32.00 36.00 41.00 46.00 50.00 55.00 60.00 65.00 70.00 75.00 80.00 85.00 90.00
Min. 6.85 7.85 9.78 12.73 16.73 18.67 21.67 23.67 26.67 29.67 31.61 35.38 40.38 45.38 49.38 54.26 59.26 64.26 69.26 74.26 79.26 84.13
Max. 8.10 9.20 11.50 15.00 19.60 21.90 25.4 27.7 31.20 34.60 36.90 41.60 47.3 53.1 57.70 63.50 69.30 75.10 80.80 86.60 92.40 98.10
Min. 7.74 8.87 11.05 14.38 18.90 21.10 24.49 26.75 30.14 33.53 35.72 39.98 45.63 51.28 55.80 61.31 66.96 72.61 78.26 83.91 89.56 95.07
Max.
Min.
Max.
Min.
Max.
Min. 2.90 3.70 4.70 6.14 7.64 9.64 10.57 12.57 14.57 15.57 17.57 18.48 21.48 23.48 25.48 28.48 30.38 33.38 35.38 37.38 41.38 44.38 47.38 50.26 53.26
Max. 1.45 1.65 2.25 2.75 3.05 3.80 3.80 4.80 4.80 4.80 5.80 5.80 5.80 7.36 7.36 7.36 7.36 9.36 9.36 9.36 9.36 9.36 11.43 11.43 11.43
Min.
Min.
Max. 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
M4 M5 M6 M8
… … 5 … … 6 … … 7.5 … … 9.5 … … 12
4.70 5.70 7.14 9.14
3.2 4.0
1.2 1.4 2.5 2.8 3.5 3.5 2 4.5 4.5 4.5 5.5 5.5 5.5
0.3
0.35
5
0.5
6.5
0.625 0.70 0.875 0.875 1.125 1.125 1.125 1.375 1.375 1.375 1.75 1.75
M10 M12
11.57 14.57 15.57 18.48 20.48 21.48 25.48 26.48 29.48 32.38 34.38 37.38 39.38 45.38 47.38 49.38 53.26 56.26 62.26 65.26 68.26
8
17 19 22 25 28 30 34 38 42 46 50 55 58 62 65 70 75 80 85 90
16.57 18.48 21.48 24.48 27.48 29.48 33.38 37.38 41.38 45.38 49.38 54.26 57.26 61.26 64.26 69.26 74.26 79.26 84.13 89.13
15 16 19 21 22 26 27 30 33 35 38 40 46 48 50 54 57 63 66 69
10 11 13 15 16 18 19 22 24 26 29 31 34 36 38 42 45 48 51 54
(M14)
M16
(M18)
M20
(M22)
M24
(M27)
M30
7 7 7 7 9 9 9 9 9
(M33)
M36
1.75 1.75 2.25 2.25 2.25 2.25 2.25 2.75 2.75 2.75
(M39)
M42
(M45)
M48
(M52)
M56
11 11 11
(M60)
89.13 103.90 100.72 94.13 109.70 106.37
M64
95.00 100.00
(M68)
99.13
115.50
112.02
a Sizes shown in parentheses are non-preferred. All dimensions are in millimeters. For illustration of hexagon slotted nuts and castle nuts see Table 3.
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