Details

• Brand:

  

  

• SKU:

  W701706-S2

• Positions: Left, Right
• Other Names:

  Exhaust Manifold Nut, Pre-Converter Nut, Nut Hex

• Description:

  The W701706-S2 is a genuine Ford hex nut built on the HN1 base with a standard right-hand thread, used most prominently to retain the exhaust manifold to its studs and also appearing on sensor-stud mountings. Dealer catalogs carry it under the dominant name Manifold Nut, and on diagrams it is also written as a Nut - Hex. and a Hexagon Nut. Documented sample applications where this exact service number is cataloged include the Ford E-350, F-150 and Ranger and the Lincoln Aviator, Navigator and Zephyr, along with the Mercury Cougar, Montego and Mystique; treat those as representative examples rather than a complete vehicle list, because Ford reuses one manifold nut across many engines and model years and does not publish a single finite fitment chart for it. An exhaust manifold nut clamps the manifold flange to its studs against high heat and constant thermal cycling, so it is typically a hardened or specialized nut rather than a generic fastener. When one is loose, seized, corroded or missing, the manifold can leak exhaust, tick on cold start, or warp at the flange. Replacing it with the correct genuine nut restores an even, gas-tight clamp at the flange. 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 applications above.

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