This operation prevents re-use of the screw or bolt but locking can be carried out by peening over about 11/2 threads. This practice can be used in the case of screwed pivots and a simple example is often found in a pair of scissors. in the case of nuts and bolts, peening is carried down to the nut to prevent it from slackening.
Countersunk screws may be locked by peening metal from the surroundings into the screw slot. This practice is sometimes adopted when the thread is inaccessible.
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