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H6 - Federal Item Name Directory
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66949
BACK-UP RING,PREFORMED PACKING
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FIIG: A528B0
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Entry Date: Aug-02-2002
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Concept:
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Status: A
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Applicability:
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Type: 0
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Definition: A circular shaped item with an aperture manufactured to predetermined dimensions, constructed with a rectangular cross section that may be solid, with joint, or in a helical form that facilitates spiral wrap installation. It prevents seal extrusion under pressure and is designed to fit on the down-pressure side of a gland groove with a PACKING, PREFORMED or O-RING.
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Corresponding NIINs: 484
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