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 6650-01-399-8552
NSN 6220-00-712-1779
NSN 6645-00-997-5986
NSN 6130-01-106-2726
NSN 6130-01-256-8489
NSN 5925-00-932-3027
NSN 5910-01-296-3935
NSN 6610-00-633-4338
NSN 5935-01-229-9364
NSN 5985-01-564-5403
NSN 5895-00-844-7523
NSN 6650-00-272-2271