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 6145-01-631-3941
NSN 5895-01-612-2943
NSN 5985-01-328-7420
NSN 5910-00-489-2875
NSN 6130-00-430-1235
NSN 5915-00-757-9875
NSN 5990-01-559-0578
NSN 6620-00-905-6590
NSN 2925-01-355-5280
NSN 6130-01-327-3261
NSN 5996-00-555-9508
NSN 5905-00-001-8762