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 6150-00-907-2647
NSN 5920-01-440-5629
NSN 5835-01-043-1576
NSN 5965-01-472-1997
NSN 5996-01-014-6103
NSN 6220-00-186-0177
NSN 6135-01-501-5376
NSN 6320-00-731-6134
NSN 5960-00-271-1396
NSN 6105-00-553-1458
NSN 6150-01-496-8640
NSN 4140-00-064-7847