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 5999-00-737-5957
NSN 6150-00-369-9116
NSN 6145-01-654-5185
NSN 5935-01-072-8693
NSN 5960-01-641-5493
NSN 6620-01-423-7300
NSN 5990-00-935-5610
NSN 6135-01-386-8548
NSN 6650-00-231-7843
NSN 5895-01-444-2041
NSN 5835-01-647-6426
NSN 6145-01-076-3699