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 6645-01-210-0036
NSN 5930-01-025-1549
NSN 5960-00-108-5318
NSN 6240-01-307-3957
NSN 4140-01-323-1259
NSN 6650-00-322-6140
NSN 6620-01-352-5640
NSN 5998-01-171-9625
NSN 6610-00-884-2824
NSN 5930-00-225-2869
NSN 5996-01-369-2678
NSN 6240-01-458-5730