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 6685-00-019-0043
NSN 6220-00-706-2772
NSN 5960-00-248-3094
NSN 6105-01-474-5246
NSN 5855-01-426-5589
NSN 6240-01-423-9738
NSN 5945-00-143-4422
NSN 5990-01-106-3786
NSN 5910-00-914-7138
NSN 5965-01-596-2944
NSN 5905-01-646-1255
NSN 5915-01-177-9527