SAE J1926 Port Diagram: What is "D4"?

morsetaper2 · Dec 17, 2015

See the attached diagram along with dimensions table. What is the purpose of "Diam D4 Gauging"?

The table for the "-6" calls out a dimension of 18 mm MIN (.709 inch). And wondering what its referring to?

Anyone know?

cvairwerks · Dec 17, 2015

My understanding would be that the D4 reference is the minimum spotface diameter that would allow the proper inspection tool to be inserted. For your marked example, the table requires the spotface to allow a 18mm diameter inspection tool to be seated.

morsetaper2 · Dec 17, 2015

Actually, I think I've figured it out now.

Is it the diameter where the 0.2 perpendicularity tolerance is to be applied?

morsetaper2 · Dec 17, 2015

That makes sense. And I also see that it defines the diameter for where the perpendicularity tolerance applies.

cvairwerks said:
My understanding would be that the D4 reference is the minimum spotface diameter that would allow the proper inspection tool to be inserted. For your marked example, the table requires the spotface to allow a 18mm diameter inspection tool to be seated.

Heavey Metal · Dec 17, 2015

Diameter of the Gage also the dia of the fitting that screws into it

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SAE J1926 Port Diagram: What is "D4"?

morsetaper2

Diamond

cvairwerks

Cast Iron

morsetaper2

Diamond

morsetaper2

Diamond

Heavey Metal

Banned

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