Locking and retaining devices

The function of a locking device is to prevent loosening or disengagement of mating components which may be operating under varying conditions of stress, temperature and vibration. The effectiveness of the locking device may be vital to safety.

One of the simplest locking devices is a locknut and these are generally thin plain nuts which are tightened against ordinary plain nuts or against components into which male threaded items are assembled. To ensure efficient locking, the bearing surfaces of the nut and component must bed together evenly and the correct degree of tightness obtained by applying the designed torque loading. The locknut should not be overtightened as this may result in the stripping of the nut threads or overstressing of the male component. In cases where rotation can occur, the plain nut must be held stationary whilst the locknut is tightened.

Bolts Orthographic Projection

Fig. 16.21 Bolts, nut and locknut


(b) Castle nut

Fig. 16.22

M68. For convenience in drawing both types of nuts, the total thickness can be approximated to the thread diameter plus 2 millimetres. The dimensions for the hexagons can be taken from Table 16.1.

Slotted nuts are reusable but difficult to apply where access is limited.

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    How draw simmonds nut engineering drawing?
    9 years ago
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    How to draw a bolt in orthographic?
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    How to sketch the othographic projection of locking devices?
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  • Robert
    What are locking and retaining devices?
    4 years ago
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    What is a locking and retaining device?
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    Why do securing devices have to be locked and labelled engineering?
    4 months ago
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    What is the purpose of locking devices engineering?
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