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 6610-00-799-6971
NSN 5915-01-026-2420
NSN 5895-01-237-3186
NSN 5905-01-239-5051
NSN 5895-01-541-5190
NSN 6135-00-432-8779
NSN 5960-01-386-9611
NSN 5910-01-284-5331
NSN 5950-01-492-5919
NSN 5985-01-122-2071
NSN 6610-01-392-8030
NSN 6220-01-157-9062