The item is a flight safety critical aircraft part (fscap)
A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery. An integral feature is incorporated for locking on the threads of a mating member.
Classification: Nuts of iron or steel
NSN 6610-01-199-4795
NSN 6135-00-444-1402
NSN 5945-01-144-5401
NSN 5935-01-379-7985
NSN 6105-01-526-1961
NSN 6620-01-606-7810
NSN 5905-01-536-7024
NSN 5985-00-869-1041
NSN 5930-00-604-3235
NSN 6135-00-577-8429
NSN 5996-01-085-9491
NSN 7035-00-803-3056