A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-00-905-7258
NSN 5895-01-054-3799
NSN 4140-00-241-0065
NSN 6150-01-003-8940
NSN 6135-00-932-3136
NSN 5975-01-325-7635
NSN 6620-01-033-7566
NSN 5910-00-410-7806
NSN 5855-01-537-0499
NSN 6685-00-412-1258
NSN 6145-01-358-3398
NSN 6150-01-159-6519