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 6685-01-439-2702
NSN 4140-00-012-3506
NSN 5855-00-361-0167
NSN 6135-01-432-6201
NSN 6645-01-591-3970
NSN 5985-01-167-9132
NSN 2925-00-508-6032
NSN 5996-00-612-1590
NSN 5945-01-248-5456
NSN 4140-01-012-2460
NSN 5985-01-458-5779
NSN 5930-00-195-5462