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Shake Proof (toothed lock) washers are often used on threaded bulk head fittings with lock nuts. Sharp teeth are formed in a twisted configuration and the edges bite into both the bolt head/nut and the mating surface, stopping the lock nut backing off under vibration.
Internal serrated shake proof washer for M10 , 3/8" 1/8" BSP
Internal Serrated Shake Proof washer for 7/16" ID
Internal Serrated Shake Proof washer for 1/2" ID
Internal Serrated Shake Proof washer for 5/8" Whitworth ID
Internal Serrated Shake Proof washer for 3/4" (M19) inner diameter
Internal Serrated Shake Proof washer for M20 ID