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 6145-01-221-0773
NSN 5999-01-040-5645
NSN 5950-00-906-9977
NSN 5960-01-126-6245
NSN 6650-00-382-6080
NSN 5915-01-235-9851
NSN 6220-01-532-6880
NSN 5985-01-246-9766
NSN 5965-01-229-7277
NSN 7035-01-423-8343
NSN 5925-00-286-8502
NSN 6685-00-269-6444