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 6150-01-058-5055
NSN 6220-01-415-4164
NSN 5895-00-076-5376
NSN 5945-00-901-2919
NSN 5999-01-011-0797
NSN 6135-01-584-0941
NSN 5920-00-889-7826
NSN 6220-01-572-5442
NSN 5960-00-993-1857
NSN 6105-01-028-0672
NSN 5855-01-525-8710
NSN 6645-01-322-4413