[Steam-engine] pipe threads

[Andy glines]

I'm a novice when it comes to pipe threads so i need a
little help.  The Huber has a "shock absorber"
aparatus connecting the bull gear to the rear wheel. 
see it here http://groups.msn.com/Racerpics/huber.msnw
 The engine uses 10 shocks and I was missing a couple.
 I have had castings made of the caps on the ends of
the pipe nipple.  I need to bore them to size and put
2" pipe threads in them.  I think that I can handle
the boring but I'm unsure about the threads. 
Threading these caps should be similar to threading a
standard pipe cap.  Will a standard pipe tap work? 
I'm afraid that the tap will bottom out before it cuts
enough threads.  Is there such a thing as a bottoming
tap for pipe threads?  

Andy Glines
Evansville, IN

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