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EGR fitting thread

EGR fitting thread

EGR fitting thread

(OP)
I am trying to identify the threads on an EGR (exhaust gas recirculation) fitting to be installed into the exhaust manifold of a 1999 Ford Expedition.  The major diameter is 1.05 and the thread appears to be 13 TPI.  I can't find any standard to which this fitting adhears to.

Could it be a special SAE thread.  I have looked thru SAE J514 REV Jun 1998 and I can't find anything with the 13 TPI.  Any help would be greatly appreciated.

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