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 6105-01-121-6048
NSN 6650-01-133-7806
NSN 5960-01-141-6489
NSN 5930-01-641-3560
NSN 6130-00-621-7997
NSN 5920-00-636-4713
NSN 5990-01-167-1308
NSN 6220-01-264-6702
NSN 5950-00-666-1887
NSN 6650-01-367-7593
NSN 6645-00-778-2839
NSN 5998-01-232-3492