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 5998-00-309-4309
NSN 6610-01-383-1830
NSN 6685-01-401-5360
NSN 5910-00-843-5757
NSN 5960-01-247-4560
NSN 5996-01-448-6814
NSN 5965-01-595-2795
NSN 6620-01-510-3501
NSN 5945-00-079-9429
NSN 5935-01-328-1758
NSN 6130-01-454-2399
NSN 5915-01-400-2420