A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6145-01-453-2987
NSN 6135-01-246-0308
NSN 5835-01-238-3381
NSN 6610-01-644-2546
NSN 6220-00-858-0925
NSN 5915-01-272-7176
NSN 6650-01-548-2123
NSN 5965-00-275-0491
NSN 5925-01-045-0150
NSN 6130-01-116-5860
NSN 5965-01-619-4846
NSN 6645-01-179-0243