THE BOLT CAP

BOLT CAPUnder certain operating conditions (e.g., vibration) threaded connections progressively’m quite unhinged by it. To avoid this, do not have to screw the lock nut: its role can play and a kind of cap, bitumen or melted plastic coated on the end of the bolt and nut.
 
V. GOLOVASHIN, Rybnoe, Ryazan region.

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