325pc Assorted UNF Nyloc Nuts Box - 1/4 to 1/2 Inch

325pc Assorted Box of UNF Nyloc Nuts - 325 nylon insert locking nuts in UNF fine thread, covering five imperial sizes from 1/4" up to 1/2".

The nylon collar sits above the thread and grips the bolt as it passes through, so the nut stays where it was set rather than working loose under vibration, and no spring washer is needed behind it. UNF is the fine imperial thread used across classic cars and motorcycles, older machinery and anything built before metric took over, and nylocs in these sizes are not always easy to find in small quantities.

Box contents (325 pieces total)
100 x 1/4" UNF
100 x 5/16" UNF
100 x 3/8" UNF
10 x 7/16" UNF
15 x 1/2" UNF

Type
Nyloc nut (nylon insert locking nut), P type, UNF fine thread, steel with nylon insert

Please note
The nylon insert limits these to moderate temperatures, so they are not suitable for exhaust or other hot applications. The locking effect is reduced once a nut has been removed and refitted, so fit a new one where the joint matters.

Suitable for
Classic cars and motorcycles, vintage tractors and plant machinery, restoration and rebuild work, machinery repairs, workshop and general imperial engineering

Also known as nylon insert nuts, nylon lock nuts, UNF locking nuts, self locking nuts, or an imperial nyloc nut assortment.