A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6150-01-317-4681
NSN 5998-00-617-2874
NSN 5960-01-136-5737
NSN 5835-01-137-6075
NSN 6685-01-141-7960
NSN 6145-01-166-3714
NSN 5935-01-544-1479
NSN 6240-00-296-0488
NSN 6135-01-116-3385
NSN 5905-01-409-2951
NSN 5920-00-964-4538
NSN 5950-01-361-5544