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 5945-01-468-6041
NSN 5950-00-571-9232
NSN 5960-00-702-0110
NSN 5998-01-317-0761
NSN 6320-00-036-3688
NSN 6685-01-218-5258
NSN 6645-00-880-4893
NSN 6320-01-425-1417
NSN 6645-00-064-9839
NSN 6620-00-596-1951
NSN 5920-01-634-0250
NSN 5950-00-174-1073