A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5910-01-135-6555
NSN 6130-01-350-3585
NSN 6645-01-123-9277
NSN 5996-01-169-4794
NSN 5999-00-477-6594
NSN 5925-01-315-9442
NSN 5990-00-557-6190
NSN 6145-01-035-5952
NSN 6240-00-267-7428
NSN 6240-01-248-4789
NSN 7035-00-392-5417
NSN 6145-00-705-6686