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 5915-00-243-2030
NSN 6610-00-581-0771
NSN 6110-00-144-6763
NSN 6135-01-472-5681
NSN 5950-00-489-0914
NSN 5895-01-388-2069
NSN 6240-01-542-0825
NSN 5920-00-164-1147
NSN 5960-00-382-6012
NSN 6610-01-250-6870
NSN 6130-00-114-2547
NSN 6650-01-550-6328