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 6685-01-658-8137
NSN 5855-00-149-0766
NSN 6610-01-168-7943
NSN 6220-01-130-0228
NSN 5925-00-350-4589
NSN 5915-01-164-0315
NSN 7035-01-570-5091
NSN 5915-01-179-0368
NSN 6620-01-650-1808
NSN 6220-01-170-6913
NSN 6150-00-950-4688
NSN 5975-00-622-4297