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 5920-00-045-4211
NSN 5960-00-121-9926
NSN 5915-00-462-3479
NSN 6105-01-475-5546
NSN 6145-01-444-1668
NSN 6110-00-861-1948
NSN 6105-01-615-3114
NSN 5985-00-169-5078
NSN 6145-01-481-3688
NSN 6610-01-556-2353
NSN 6650-01-519-9165
NSN 6105-00-999-8806