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 5935-01-128-4919
NSN 5945-01-290-6977
NSN 5975-01-129-6217
NSN 2925-01-177-1598
NSN 5950-01-555-8152
NSN 6685-01-330-2605
NSN 6610-01-085-0804
NSN 6240-01-247-4805
NSN 6650-01-652-5958
NSN 6110-00-912-6575
NSN 5855-01-358-1939
NSN 5935-01-540-8666