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 5999-00-056-1697
NSN 6105-01-144-8441
NSN 6135-01-265-1384
NSN 5895-01-555-5330
NSN 5999-01-480-2241
NSN 6645-00-462-7072
NSN 5998-01-555-8489
NSN 6150-01-169-7380
NSN 6610-00-186-9180
NSN 6685-01-482-4100
NSN 5996-01-514-7341
NSN 5925-01-384-3402