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 5999-01-431-5559
NSN 6105-00-239-0266
NSN 6645-01-326-2560
NSN 5965-01-212-6817
NSN 5915-01-474-1937
NSN 5950-01-646-1253
NSN 6320-01-539-1997
NSN 5835-01-584-8538
NSN 6135-01-413-4747
NSN 6645-01-044-6376
NSN 6145-00-530-3811
NSN 7035-01-249-4547