A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5996-01-359-5912
NSN 5855-01-392-1808
NSN 5999-01-214-2466
NSN 5925-01-282-8661
NSN 6620-00-515-6422
NSN 6145-01-046-8063
NSN 5996-00-511-9354
NSN 5950-01-429-9057
NSN 6685-01-548-9005
NSN 5930-00-191-6569
NSN 6150-00-496-0332
NSN 5945-01-446-2890