Rockwell c sclae 43 to 48 hardness
An item formed from sheet spring material into varying flat, concave, curved, or nutlike design. It has an aperture with an elliptical-shaped hole or suitable lugs or prongs designed to retain threaded or unthreaded stud like projecting memebers. When pushed on, it grips by imbedding into the material of the projecting memebers, and does not mate with a thread helix. See also ring, retaining.
NSN 6105-01-237-8912
NSN 5895-01-383-4853
NSN 6610-01-283-8888
NSN 6620-00-248-6950
NSN 6645-01-163-8002
NSN 6320-01-558-8844
NSN 5975-01-129-8978
NSN 6320-01-449-1014
NSN 6110-01-567-2660
NSN 5985-01-030-0113
NSN 5935-01-175-0276
NSN 2925-00-480-9068