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 6130-00-159-8034
NSN 6130-00-139-9232
NSN 5910-00-177-6752
NSN 6685-00-508-9058
NSN 6320-01-492-1976
NSN 5905-01-607-6722
NSN 6135-00-998-5884
NSN 6620-01-412-0938
NSN 5996-01-377-3743
NSN 6145-01-044-8800
NSN 6105-00-489-1305
NSN 6610-00-553-5103