A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6135-01-142-6456
NSN 5855-01-136-9532
NSN 5960-01-307-2673
NSN 5935-01-489-6183
NSN 5975-00-145-7286
NSN 5975-00-678-5958
NSN 6240-01-633-9357
NSN 5998-00-058-2602
NSN 6145-00-925-2004
NSN 5996-01-108-3380
NSN 5925-00-139-1708
NSN 6150-00-232-6568