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 6110-01-579-3399
NSN 5960-01-323-6432
NSN 5999-00-707-6083
NSN 6240-00-782-5991
NSN 5855-01-070-8084
NSN 5835-00-148-9719
NSN 6135-00-574-1204
NSN 7035-00-541-8516
NSN 6110-01-167-8906
NSN 5835-01-548-4955
NSN 6150-01-049-9906
NSN 5990-01-320-1412