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 7035-01-621-9471
NSN 6240-01-596-3183
NSN 2925-00-101-7972
NSN 4140-01-050-9194
NSN 5935-01-008-0425
NSN 5905-01-631-8283
NSN 5945-01-511-7182
NSN 5925-01-498-5089
NSN 5925-01-037-5866
NSN 5910-01-418-4473
NSN 6220-00-231-5778
NSN 6110-01-348-8843