A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6620-01-401-5356
NSN 6110-01-452-1719
NSN 5905-01-154-8296
NSN 5960-00-401-0794
NSN 5985-01-193-3933
NSN 5999-01-100-3221
NSN 6650-01-514-9139
NSN 5905-00-175-5307
NSN 5960-00-683-7476
NSN 5975-01-443-2084
NSN 6645-00-959-6502
NSN 6150-01-487-6335