Speed nut

The fastener serves the functions of both a lock washer and a nut.

Speed nuts that attach to the workpiece usually are some form of a J-nut or U-nut.

[4] The company, established in 1870, originally manufactured sheet metal kitchen ranges.

However, after Tinnerman invented the nut to resolve issues with stove shipping, the invention became so successful it led the company away from building stoves to building fasteners.

[5] Tinnerman Products was formed in 1939, and evolved from the Speed Nut development with manufacturing plants in Cleveland, Ohio.

U-nut on the left, speed nut on the right to be used with a self-tapping screw
Albert H. Tinnerman left, at the plant opening on Brookpark Road, 1950, presents keys to Mayor Thomas A. Burke right, Cleveland and to Mayor John M. Coyne far right, Brooklyn.