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 5855-01-562-7562
NSN 5930-01-435-6542
NSN 6150-01-502-4460
NSN 5960-00-267-9298
NSN 7035-01-166-7857
NSN 5996-01-181-5438
NSN 6150-00-233-6356
NSN 6105-00-824-1188
NSN 5905-01-609-0988
NSN 2925-00-617-0826
NSN 5950-01-536-1161
NSN 5996-01-181-5438