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 5930-00-520-8153
NSN 6130-00-165-2213
NSN 6110-01-595-2962
NSN 5998-01-416-7667
NSN 5855-01-020-7982
NSN 7035-00-470-4977
NSN 5960-01-133-3551
NSN 6685-01-291-3330
NSN 6645-01-113-6712
NSN 6220-01-097-1212
NSN 5998-01-533-4077
NSN 6110-01-177-3697