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 6610-00-419-7844
NSN 6145-00-071-2549
NSN 6610-01-492-6515
NSN 5999-01-020-5907
NSN 5855-01-366-2429
NSN 2925-01-620-9673
NSN 5999-01-601-7492
NSN 6610-01-371-4007
NSN 6650-00-937-5319
NSN 2925-01-545-2717
NSN 5945-01-558-8900
NSN 5915-01-253-8913