These Self-lock Hex Nuts are six-sided nuts with nylon-filled collars These collars adhere to the thread of the fastener bolt or screw giving a more secure fix When a bolt or screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement of the fastener The number of threads thread pitches indicated by M value and width across the flat outer sides of the bolt is indicated by the SW value
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