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 5835-00-564-0057
NSN 5945-01-302-1074
NSN 5990-00-161-2797
NSN 5855-01-527-0392
NSN 6610-01-075-2773
NSN 5925-01-489-2791
NSN 6685-00-968-8200
NSN 6320-01-247-0898
NSN 7035-01-286-2677
NSN 5925-00-325-4424
NSN 6610-00-116-5725
NSN 6110-01-367-0833