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 5910-01-598-9038
NSN 6645-01-056-5291
NSN 6620-01-311-3516
NSN 5975-01-614-3762
NSN 5998-00-834-7122
NSN 5950-00-998-2110
NSN 5965-00-267-4173
NSN 5996-01-351-5699
NSN 5905-01-301-9840
NSN 5985-01-634-0635
NSN 6150-00-254-1041
NSN 6645-01-466-2083