Machine Drawing

88 Machine Drawing

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d:\N-Design\Des5-1.pm5 Seventh Print

Major or nominal diameter of bolt = D

Thickness of nut, T = D

Width of the nut across flats, W = 1.5 D + 3 mm

Radius of chamfer arc, R = 2 D

Figure 5.14 illustrates the method of drawing views of a square nut, in two orientations.

W

D

R

D

D

R 1

R D

W

Fig.5.14 Method of drawing the views of a square nut

5.9.3 Hexagonal and Square Headed Bolts

Figure 5.15 shows the two views of a hexagonal headed bolt and square headed bolt, with the

proportions marked.

2D

2D

0.75 D L

D

(a) Hexagonal headed bolt

W

2D

0.75 D L

D

(b) Square headed bolt

Fig. 5.15