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 5920-01-227-4623
NSN 5945-01-456-2999
NSN 5925-01-287-9206
NSN 5925-00-740-6835
NSN 6110-01-458-6332
NSN 6645-01-344-8702
NSN 5950-01-327-4359
NSN 6685-01-285-4537
NSN 7035-00-150-2379
NSN 7035-01-541-6900
NSN 7035-01-175-4321
NSN 7035-00-003-7518