A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6685-01-167-8612
NSN 2925-01-209-9245
NSN 5960-01-423-4240
NSN 5835-01-561-2959
NSN 5905-01-139-4377
NSN 5950-01-241-8736
NSN 5985-01-574-4501
NSN 6610-00-663-4163
NSN 4140-01-322-4591
NSN 2925-01-328-4394
NSN 5835-00-665-3395
NSN 5945-01-180-6063