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 5950-00-469-9426
NSN 6145-01-056-5171
NSN 5965-00-913-9545
NSN 6130-01-344-4827
NSN 6320-01-642-2615
NSN 5990-00-066-2217
NSN 6150-00-918-3900
NSN 5999-01-078-3779
NSN 6145-01-655-2334
NSN 6240-01-473-0049
NSN 6620-01-223-2441
NSN 5905-01-051-6695