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 5915-00-035-4462
NSN 6650-01-406-9852
NSN 5925-01-607-6279
NSN 6610-00-499-4642
NSN 5855-01-464-3152
NSN 6650-01-607-2620
NSN 5925-00-852-2295
NSN 5999-00-056-4745
NSN 5905-00-943-1126
NSN 6620-01-161-0698
NSN 5965-00-671-4119
NSN 5985-00-246-3875