Details

• Brand:

  

  

• SKU:

  W703662-S403

• Other Names:

  Muffler & Pipe Nut, Exhaust Manifold Nut, Exhaust Pipe Nut, Nut Hex

• Description:

  The W703662-S403 is a genuine Ford hexagon nut from the W703662 -S403 fastener family, used at exhaust and oxygen-sensor mounting points where a heat-tolerant nut clamps a flange or bracket to its stud. Dealer catalogs carry it under the dominant name Hexagon Nut, and it is cataloged in the exhaust and heated-oxygen-sensor area of the engine; the broader -S403 suffix family is consistently used for exhaust and manifold hex nuts. A documented sample application where this exact service number is cataloged is the Ford Fiesta, where it appears in the oxygen-sensor and exhaust mounting diagram; treat that as a representative example rather than a complete vehicle list, because Ford reuses one nut across many engines and model years and does not publish a single finite fitment chart for it. A nut in this role clamps an exhaust or sensor bracket flange to its stud against high heat and constant thermal cycling, so it is typically a hardened or coated nut, and a fresh nut is normally used on reassembly to ensure a reliable clamp. When one is loose, seized, corroded or missing, the joint can leak exhaust, tick, or loosen under heat and vibration. Because the suffix code denotes a specific thread size, material and finish, confirm fit for your exact vehicle by VIN before ordering rather than relying on the sample application above.

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