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 5998-01-415-5525
NSN 5930-01-431-8709
NSN 5855-01-321-3881
NSN 5935-00-450-2011
NSN 7035-00-417-2967
NSN 4140-00-836-0680
NSN 6650-01-485-3444
NSN 5965-01-286-6548
NSN 5998-01-576-9581
NSN 6220-01-193-4893
NSN 6685-00-726-8146
NSN 6135-01-067-8331