A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6145-00-450-6483
NSN 5998-01-474-5238
NSN 6145-01-028-2591
NSN 5965-01-603-0118
NSN 6150-01-227-3149
NSN 5985-00-186-8755
NSN 5895-01-528-7708
NSN 6620-01-510-6367
NSN 6645-00-925-2887
NSN 6130-01-006-0619
NSN 6150-01-634-0575
NSN 5905-01-545-3119