92 Machine Drawing
dharm
d:\N-Design\Des5-1.pm5 Seventh Print
D
2.2 D
D
0.25 D
a - Flanged nut
1.5D+3
0.5 D
D
0.25 D
D
b - Cap nut
D
D
0.5 D
c - Dome nut
1.8 D
0.5 D
D
D
D
0.1 D
0.5 D
1.8 D
1.5 D
D
2D
0.4 D
0.6 D 1.5 D
1.2 D
D
0.2 D
0.2 D
d - Capstan nut
0.2 D
e - Ring nut f - Wing nut
0.2 D
Fig. 5.23 Other forms of nuts
5.9.6.5 Slotted or Ring Nut
This nut is in the form of a ring, with slots in the curved surface, running parallel to the axis. A
special C-spanner is used to operate the nut. These nuts are used on large screws, where the use
of ordinary spanner is inconvenient (Fig. 5.23e).
5.9.6.6 Wing Nut
This nut is used when frequent removal is required, such as inspection covers, lids, etc. It is
operated by the thumb (Fig. 5.23f).
5.9.7 Cap Screws and Machine Screws
Cap screws and machine screws are similar in shape, differing only in their relative sizes. Machine
screws are usually smaller in size, compared to cap screws. These are used for fastening two
parts, one with clearance hole and the other with tapped hole. The clearance of the unthreaded
hole need not be shown on the drawing as its presence is obvious. Figure 5.24 shows different
types of cap and machine screws, with proportions marked.
