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 5999-01-477-9201
NSN 6320-01-157-9076
NSN 5910-00-240-8328
NSN 5915-00-528-9286
NSN 6620-01-437-8193
NSN 2925-01-434-2502
NSN 5950-00-818-0227
NSN 5960-01-087-6083
NSN 5990-00-223-5938
NSN 5895-00-941-0866
NSN 6240-00-732-0496
NSN 7035-00-849-5526