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 5905-00-057-6725
NSN 6320-01-371-3047
NSN 6320-01-411-7469
NSN 5998-01-258-5542
NSN 5925-01-623-3864
NSN 5920-00-372-5864
NSN 5990-01-044-4767
NSN 7035-00-064-7008
NSN 5985-01-219-1729
NSN 6150-00-812-8145
NSN 6150-01-512-0222
NSN 5910-01-332-8362