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 5920-01-225-2000
NSN 6220-01-599-1993
NSN 5895-01-130-6922
NSN 6135-01-526-6530
NSN 5990-01-037-9801
NSN 6620-01-336-8670
NSN 6645-01-593-3608
NSN 6220-00-361-8338
NSN 6130-01-080-9469
NSN 6650-01-176-8785
NSN 5985-00-195-9425
NSN 5930-00-151-9286