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 5905-01-313-0912
NSN 5950-01-399-0248
NSN 5935-01-010-0491
NSN 5920-01-133-9716
NSN 5915-01-319-6462
NSN 5990-01-254-3197
NSN 5915-01-218-6637
NSN 5910-01-506-9252
NSN 5915-01-227-2337
NSN 5960-01-518-4440
NSN 5855-01-439-1838
NSN 6135-00-203-9645