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 5930-01-643-9387
NSN 6620-00-203-9466
NSN 5930-01-333-1059
NSN 6220-01-296-2567
NSN 6240-01-463-3132
NSN 6685-00-720-3525
NSN 5945-00-828-0337
NSN 7035-01-394-3169
NSN 5965-00-706-7005
NSN 5965-01-017-1451
NSN 6130-01-634-0603
NSN 6645-01-521-8525