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 6145-01-010-3402
NSN 5950-00-344-7513
NSN 2925-00-905-2655
NSN 7035-00-108-4421
NSN 5945-01-037-6436
NSN 5925-01-349-0028
NSN 6145-01-115-4543
NSN 6685-01-059-2745
NSN 6150-01-018-3764
NSN 5965-01-347-1670
NSN 5905-01-305-7139
NSN 5990-01-269-2111