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 5915-00-916-2290
NSN 5930-01-335-7508
NSN 7035-01-411-6062
NSN 5985-01-474-8176
NSN 5996-01-367-0778
NSN 5910-00-992-5444
NSN 6105-01-013-9252
NSN 6145-00-512-6675
NSN 5895-01-143-9333
NSN 5935-01-286-0611
NSN 6150-01-053-3713
NSN 2925-00-534-4565