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 5990-01-345-1468
NSN 5910-01-573-6538
NSN 4140-01-460-5078
NSN 6645-01-473-9179
NSN 5965-01-077-3346
NSN 5945-01-171-0130
NSN 6150-01-463-3327
NSN 4140-01-142-3192
NSN 6685-00-364-5404
NSN 6320-01-155-4807
NSN 5950-01-518-0655
NSN 6240-00-788-6972