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On Sat, 19 Jun 2004 21:31:54 -0400, Glenn Ashmore
wrote: Has anyone ever had any experience with or heard of a Nyloc nylon lined nut backing off a bolt? snip Now the problem. A New Zealand sailor is claiming that his anchor (which thankfully I did not sell) failed because the nut backed completely off the bolt which allowed the bolt to fall out. There is very little vibration and no torque on the bolt. The nut was in good condition, new when installed and had never been removed. Is there any way that a Nyloc nut in good condition could possibly make more than 20 turns on a loose bolt on its own? Was the anchor set, or was the anchor in the boat? If there was some sort of repetitive motion where the shank continually rotated the bolt, it might have backed the bolt out of the nut. Nylock (or nylock type) nuts don't have a tremendous amount of torque resistance -- just enough that they don't turn easily. I can't quite turn one with my fingers, but can turn them easily with any kind of driver including a bare socket (no drive). There is a reason why moused or safety- wired pins are traditional in ground tackle. |