A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6610-01-555-8364
NSN 6645-01-143-7838
NSN 5999-00-469-1052
NSN 5975-01-364-5945
NSN 5998-01-122-3609
NSN 5835-00-740-0246
NSN 5996-01-069-2915
NSN 6685-00-784-0516
NSN 5835-00-804-0569
NSN 5905-01-281-0630
NSN 5920-01-089-1875
NSN 7035-01-261-9850