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 6150-00-481-1915
NSN 5985-01-613-0240
NSN 6135-01-071-4923
NSN 5905-01-235-1645
NSN 5965-00-973-9974
NSN 6620-00-257-2783
NSN 5905-01-344-1545
NSN 5996-01-274-5513
NSN 6110-01-442-8592
NSN 5835-01-573-8449
NSN 6145-00-465-1641
NSN 2925-01-347-9346