A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6610-00-813-7023
NSN 7035-00-167-7411
NSN 5905-01-326-0699
NSN 5835-01-316-3255
NSN 6135-00-152-8729
NSN 5950-01-470-6607
NSN 5910-00-411-6395
NSN 5835-01-549-9405
NSN 5915-00-595-8090
NSN 6220-00-171-8638
NSN 6130-01-225-0675
NSN 6685-01-408-5553