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 6240-01-032-4624
NSN 5835-01-553-6772
NSN 5895-01-537-6398
NSN 5925-01-113-4223
NSN 6645-01-312-8601
NSN 5990-01-591-8797
NSN 7035-01-179-5667
NSN 5975-01-383-8279
NSN 5999-00-578-0717
NSN 5985-00-856-0835
NSN 7035-01-576-4099
NSN 6110-01-630-7321