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 6135-00-351-8606
NSN 6240-01-329-2453
NSN 6685-01-068-6514
NSN 6320-00-391-5906
NSN 6650-01-409-0820
NSN 6130-01-442-3796
NSN 7035-01-078-0155
NSN 5910-01-222-1624
NSN 6620-01-093-6959
NSN 5925-00-539-8372
NSN 7035-00-541-8516
NSN 6110-01-191-5737