A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6620-01-529-2518
NSN 5965-01-460-9743
NSN 5985-00-415-1660
NSN 6645-01-589-0983
NSN 5965-01-045-0247
NSN 5990-01-176-2724
NSN 5920-00-406-2712
NSN 6105-01-140-9837
NSN 5999-01-401-5322
NSN 5905-01-081-5037
NSN 6685-00-651-9879
NSN 6650-01-445-7250