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 5990-00-277-3763
NSN 5950-00-204-6693
NSN 6220-00-165-1509
NSN 2925-00-192-1166
NSN 5895-00-493-0042
NSN 5930-01-439-1147
NSN 6130-01-478-8473
NSN 5998-01-179-5890
NSN 6610-00-482-2265
NSN 5835-01-295-1318
NSN 6320-00-284-1524
NSN 4140-01-422-4431