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 5835-00-155-1379
NSN 5985-00-870-0785
NSN 5915-00-530-5067
NSN 5990-00-253-6694
NSN 5985-01-605-0230
NSN 5930-01-009-7603
NSN 5965-01-085-6158
NSN 5925-00-517-8512
NSN 6685-01-136-6885
NSN 5975-01-245-2490
NSN 5915-00-633-1217
NSN 5935-01-377-5888