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Nyloc nut re-use
2

Nyloc nut re-use

Nyloc nut re-use

(OP)
Does anyone know please, if there a limit on the number of times you can re-use a nyloc nut?

Thanks

RE: Nyloc nut re-use

rattler,

For the cost of replacing, use once.

Haggis

RE: Nyloc nut re-use

The number of reuses will depend on the requirement that you have for prevaling trorque on the nut once it is broken loose from the application.  

RE: Nyloc nut re-use

Typical automotive specifications require a minimum off torque after 5 on-off cycles, so 5 is a place to start.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: Nyloc nut re-use

Actually in at least one paper from Nyloc that I read while I was over there said that most nuts were a "one time" use item.
Another discussion came up at the time---counterfit nyloc fasteners, indeed, counterfit 'grade 8' fasteners.  I got a batch of 5/16th NF nuts that stripped when torqued to over 144 in/lbs.  Torque for that application was supposed to be 300 in/lbs.

Rod

RE: Nyloc nut re-use

(OP)
Thanks everyone. I've just received a fax from my fastener supplier containing an extract from an old Nyloc publication that claims "Nyloc nuts can be re-used many times without impairing their self-locking action". It details various successful tests where rundown torques were measured after a number of removals. I'm happy to follow this advice in my current application, as the consequence of the nuts undoing is not safety critical.

Thanks

Rattler

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