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 5990-00-105-7831
NSN 5950-01-441-5682
NSN 6110-00-877-9603
NSN 5999-01-190-5572
NSN 5895-01-130-6072
NSN 5975-01-469-8635
NSN 6320-00-284-1524
NSN 5950-01-348-6681
NSN 6685-01-240-7790
NSN 6240-01-535-8066
NSN 6150-00-357-1153
NSN 6610-01-247-6374