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 5925-01-328-0327
NSN 5965-00-452-0967
NSN 5998-00-407-0508
NSN 5950-00-758-3950
NSN 6150-01-589-0482
NSN 6110-00-172-6126
NSN 6685-00-128-7981
NSN 6685-00-088-4539
NSN 5930-00-035-9117
NSN 5905-01-032-4571
NSN 5935-01-322-5966
NSN 5965-00-845-6325