Machine Drawing

96 Machine Drawing

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

5.10.4 Wile’s Lock nut

It is a hexagonal nut with a slot, cut half-way across it. After tightening the nut in the usual

manner, a set screw is used from the top of the nut, compressing the two parts. For this

purpose, the upper portion of the nut should have a clearance hole and the lower portion

tapped (Fig. 5.30).

5.10.5 Locking by Set Screw

In this arrangement, after the nut is tightened, a set screw in fitted in the part, adjoining the

nut, so that it touches one of the flat faces of the nut. The arrangement prevents the loosening

tendency of the nut (Fig. 5.31).

2D

0.75 D

D

SCREW, DIA 0.25 D

LONG 0.75 D

0.5 D

0.15 D

D D

2D

D

SCREW, DIA 0.2 D

LONG 0.9 D

Fig. 5.30 Wile’s lock nut Fig. 5.31 Locking by set screw

5.10.6 Grooved Nut

It has a cylindrical grooved collar, integrally provided at the lower end of the nut. This

collar fits into a corresponding recess in the adjoining part. In this arrangement, after

tightening the nut, a set screw is inserted from one end of the upper part, so that the end

of the set screw enters the groove, preventing the loosening tendency of the nut (Fig. 5.32).

5.10.7 Locking by Screw

In this, a cap nut with an integral washer and with a threaded hole in the cylindrical cap, is

used. A corresponding tapped hole at the top end of the bolt is also required for the purpose.