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 6240-00-557-7471
NSN 6650-01-197-0587
NSN 6110-01-483-2166
NSN 5996-00-042-5682
NSN 5965-00-150-1144
NSN 6135-00-686-4777
NSN 6645-01-645-4291
NSN 6620-00-140-5292
NSN 5855-01-143-7051
NSN 5835-01-328-6626
NSN 5950-00-838-4005
NSN 5835-01-399-5820