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 6320-01-446-6775
NSN 4140-01-455-5170
NSN 7035-01-497-6875
NSN 6645-01-220-2838
NSN 5915-00-894-3825
NSN 5855-00-149-0766
NSN 6220-00-269-0459
NSN 2925-01-305-1370
NSN 6620-01-054-9346
NSN 5950-00-439-6259
NSN 5998-01-532-6120
NSN 6105-00-273-1106