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 6220-00-852-8317
NSN 6220-01-243-6678
NSN 5985-01-418-4207
NSN 5960-01-441-7047
NSN 6240-01-041-2519
NSN 5960-01-605-9921
NSN 5895-01-065-2336
NSN 6110-00-959-7002
NSN 6240-01-429-2747
NSN 5855-01-485-4327
NSN 6105-01-247-4804
NSN 5950-01-136-2366