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 6150-00-574-3275
NSN 5925-00-590-9091
NSN 5935-01-142-4620
NSN 5895-01-189-2919
NSN 6240-00-578-7422
NSN 5835-01-406-9638
NSN 6620-00-213-8569
NSN 6105-01-341-4307
NSN 5975-01-336-1781
NSN 5920-00-243-9506
NSN 5895-01-445-6341
NSN 5930-01-469-1740