Page 183 - Engineering drawing from first principles using AutoCAD

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CHAMFER
CIRCLE
DIAl

R =THREAD DIAl

MAJOR DIAl

MINOR DIAl

DISTANCE
ACROSS CORNERS

Figure 8.4

Table 8.1 Dimensional details of nuts and bolts; the figures from the appropriate standards
have been rounded up to the nearest 015mm for convenience of CAD drawing
D A B AIC A/F H T t

M116 0135 iii 3.5 3.0 1.0 1.25
M2 0.4 1.4 4.5 4.0 1.5 1.5
M2.5 0.45 1.9 5.5 5.0 1.75 2.0
M3 0.5 2.3 6.0 5.5 2.0 2.25
M4 0.7 3.0 8.0 7.0 2.75 3.0
M5 0.8 3.9 9.0 8.0 3.5 4.0
M6 1.0 4.7 11.5 10.0 4.0 5.0
M8 1.25 6.4 15.0 13.0 5.5 6.5 5.0
M10 1.5 8.1 19.5 17.0 7.0 8.0 6.0
M12 1.75 9.7 21.5 19.0 8.0 10.0 7.0
M16 2.0 13.5 27.0 24.0 10.0 13.0 8.0
M20 2.5 16.7 34.0 30.0 13.0 16.0 9.0
M24 3.0 20.0 41.5 36.0 15.0 19.0 10.0
M30 3.5 25.5 52.0 46.0 19.0 24.0 12.0
M36 4.0 31.0 62.5 55.0 23.0 29.0 14.0

Notes
A, thread pitch; D, nominal size thread diameter; 8, minor diameter of thread; A/C, width across corners;
A/F, width across flats; H, height of bolt head; T, thickness of normal nut; t, thickness of thin nut.