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 5915-01-423-8561
NSN 5985-00-054-7689
NSN 5965-01-582-6219
NSN 6130-01-511-8600
NSN 5925-00-695-9414
NSN 6150-00-073-3007
NSN 5996-01-202-6544
NSN 5998-00-556-6328
NSN 6135-01-373-2518
NSN 6645-01-058-3817
NSN 5975-01-370-4455
NSN 5910-01-525-8184