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 2925-01-473-9544
NSN 5855-01-076-9369
NSN 5895-01-145-4419
NSN 5915-01-605-2725
NSN 5925-01-093-9455
NSN 6645-01-356-1179
NSN 6240-01-224-6941
NSN 6620-01-650-5226
NSN 6645-01-134-2976
NSN 5930-00-481-8026
NSN 5990-01-419-0661
NSN 6320-01-392-6922