A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-01-251-7887
NSN 6220-01-509-8035
NSN 5935-01-602-9648
NSN 6685-01-487-5624
NSN 5905-01-352-4785
NSN 6220-00-239-0302
NSN 5975-01-563-0034
NSN 5975-01-150-7948
NSN 6220-01-510-9765
NSN 6220-00-174-5876
NSN 6620-01-550-8573
NSN 6220-01-190-8605