Supermax 1338 crossfeed acme?

As said above it's more than likely 5/8 left hand. Acme stepped taps are expensive.
you could buy some 5/8 LH acme rod and make your own tap. I did this while making a new nut for my lathe. I had a piece of acme rod.
 
Mcmaster Carr sells Acme lead screws and nuts that you can cut and machine to meet your needs.

 
Mcmaster Carr sells Acme lead screws and nuts that you can cut and machine to meet your needs.

It was 5/8-8 ..... made a new one today , 1 thousands backlash
 

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Finished .... 0 backlash
 

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