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 5975-01-429-0022
NSN 5855-00-004-0904
NSN 6105-00-391-7634
NSN 4140-01-473-2922
NSN 5905-01-483-2324
NSN 5960-01-354-0762
NSN 5985-00-277-0575
NSN 6110-00-811-0363
NSN 5998-01-502-9439
NSN 5925-00-122-3247
NSN 5835-00-405-4560
NSN 5835-01-366-5907