A soft metal or nonmetal sleeve, designed to mate with a pin-rivet. it may include an external wrenching facility which breaks off at a perdetermined torque to form a head.
NSN 6620-01-034-4539
NSN 6220-01-231-6376
NSN 5999-01-357-6399
NSN 5990-01-070-4627
NSN 2925-01-510-9378
NSN 6135-01-265-1384
NSN 5975-01-596-4936
NSN 5920-00-935-2275
NSN 6145-00-534-1412
NSN 6150-00-084-3537
NSN 5999-01-386-5834
NSN 5990-00-518-3195