5/16 in. -18 tpi Plain Steel Type U Speed Nut
Everbilt. $6.49. In stock.
These speed nuts are made of stamped spring steel and are meant for spaces with minimal clearance. The design is for a quick application and removal making the nuts reusable. They act as both a lock washer and nut so can generally eliminate the need for lock washers and can be used with either sheet metal or machine screws.
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