A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6620-00-816-9755
NSN 6240-00-698-5822
NSN 5975-01-060-4903
NSN 6685-00-228-9363
NSN 5905-01-074-9375
NSN 5990-01-331-9438
NSN 5905-01-473-1088
NSN 5910-01-481-8145
NSN 6610-01-078-5270
NSN 6685-00-455-9941
NSN 5855-01-088-8700
NSN 6650-00-136-6003