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 6650-01-034-6040
NSN 6150-01-076-4724
NSN 6105-01-647-8234
NSN 5915-01-585-7676
NSN 5975-01-627-6394
NSN 5935-01-092-4270
NSN 5925-00-216-4480
NSN 5935-00-874-1084
NSN 5945-00-334-4991
NSN 5910-01-106-4488
NSN 5935-01-337-0288
NSN 6240-01-152-9015