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 6610-00-664-2190
NSN 5996-01-064-6969
NSN 5925-00-331-9297
NSN 5975-01-310-1953
NSN 5905-00-964-5517
NSN 5835-01-502-9228
NSN 6650-01-472-8804
NSN 5945-01-361-9775
NSN 5930-00-148-9247
NSN 4140-01-444-5292
NSN 6135-01-373-2518
NSN 6645-01-100-3296