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 5998-01-109-9544
NSN 2925-00-446-2447
NSN 5975-01-412-6440
NSN 7035-01-393-6015
NSN 6130-00-450-3928
NSN 5905-00-932-3323
NSN 5920-01-145-3150
NSN 6145-00-343-5967
NSN 5930-01-103-1591
NSN 5996-01-303-4492
NSN 6110-01-262-1626
NSN 6320-01-378-6191