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 5975-01-544-0856
NSN 6150-01-555-7473
NSN 6320-01-247-0898
NSN 6650-00-764-8310
NSN 6110-01-559-4576
NSN 5950-01-649-1289
NSN 6620-01-304-1761
NSN 5895-00-932-4711
NSN 5925-01-154-6796
NSN 6135-01-490-7704
NSN 5930-00-409-2307
NSN 6610-01-483-0584