A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6145-00-382-6199
NSN 5905-01-440-4916
NSN 6320-01-157-9076
NSN 5985-00-005-0376
NSN 4140-01-475-6839
NSN 5935-01-010-8931
NSN 5985-01-382-6878
NSN 6220-01-246-4285
NSN 5925-00-552-5089
NSN 6650-01-328-8363
NSN 5910-00-686-1246
NSN 5950-00-724-7107