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 5996-01-123-9038
NSN 6650-01-319-8204
NSN 5895-00-652-1372
NSN 5915-01-186-9384
NSN 5925-01-349-7193
NSN 6610-01-257-5808
NSN 5835-01-615-8864
NSN 5930-01-115-2322
NSN 6610-01-414-1755
NSN 6130-01-423-0270
NSN 5915-01-494-3176
NSN 6105-01-500-4242