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 5950-00-921-8374
NSN 6610-00-760-4476
NSN 4140-01-015-9283
NSN 5925-01-237-2501
NSN 5905-01-264-0605
NSN 6685-01-180-3807
NSN 6620-01-344-6074
NSN 5915-01-076-5754
NSN 6135-00-347-0595
NSN 5895-01-314-8669
NSN 5975-00-971-8863
NSN 5935-01-512-1988