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 6150-01-613-0582
NSN 6320-00-004-9158
NSN 6105-01-561-0330
NSN 6130-01-441-2618
NSN 6320-01-532-6746
NSN 5920-00-014-6607
NSN 5915-00-232-8153
NSN 6220-01-126-6795
NSN 6650-01-546-7632
NSN 6610-01-166-4860
NSN 6610-01-168-7943
NSN 5999-01-262-2957