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 5920-01-290-3771
NSN 5999-01-485-3562
NSN 6110-01-124-6864
NSN 6610-01-122-0064
NSN 5960-01-617-6345
NSN 6130-01-519-5359
NSN 6620-00-511-3355
NSN 5975-01-611-3688
NSN 6610-01-019-5827
NSN 5945-00-968-5450
NSN 4140-01-330-4137
NSN 6150-01-050-8763