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 5855-00-198-3197
NSN 4140-01-067-8986
NSN 2925-01-315-1714
NSN 5925-01-414-6866
NSN 6110-01-210-9993
NSN 6150-01-199-6289
NSN 6220-00-171-8638
NSN 4140-00-034-2116
NSN 6240-01-187-3687
NSN 5930-00-482-5780
NSN 6135-01-268-7056
NSN 6650-00-056-1581