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 6650-01-105-2825
NSN 5925-01-298-7163
NSN 6220-01-234-0987
NSN 6105-01-065-0341
NSN 5910-01-391-4153
NSN 4140-01-351-2586
NSN 5855-00-089-3974
NSN 6610-01-212-6464
NSN 6240-00-617-9599
NSN 6645-01-445-9089
NSN 4140-01-385-7100
NSN 6135-00-100-0485