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 5960-00-126-9669
NSN 6645-00-070-0896
NSN 5920-01-631-4009
NSN 6105-01-448-6319
NSN 6650-00-999-8902
NSN 5920-00-004-6372
NSN 6130-00-208-2906
NSN 5996-01-079-3651
NSN 5835-01-376-8454
NSN 5999-01-359-2087
NSN 5835-01-190-0482
NSN 6645-01-507-2887