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 5985-01-471-8176
NSN 6645-01-147-5579
NSN 6145-01-578-1561
NSN 5925-01-482-1134
NSN 5910-01-586-2719
NSN 7035-01-577-1713
NSN 6110-01-226-8139
NSN 5985-00-300-3970
NSN 5965-00-419-9590
NSN 5998-01-119-1301
NSN 6105-01-281-7583
NSN 7035-01-112-4565