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Correct Dies for threading black pipe

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  • Correct Dies for threading black pipe

    Greetings ya'll.

    I use a model 300 pipe machine. I use a 611 head for the 1" - 2" and a Universal head for the 1/2" and 3/4"

    I bought Ridgid Cat. No. 47765 for 1/2" - 3/4" NPT
    Ridgid Cat. No. 47770 for 1" - 2" NPT.

    I've threaded alot of pipe in my time, but never was the one who had to order and change dies, (UNTIL NOW).

    When I thread a pipe, a fitting won't screw onto it. I under cut and the fitting still won't screw on. If I REALLY under-cut, the threads don't look right and the fitting is sloppy-fitting and the end of the pipe can fit in almost a quarter inch, before the fitting catches threads.
    I will include a pic so you can maybe see the samething I am.

    The pipe on the bottom is correctly threaded, the pipe above it is what I threaded. Notice two things: Doesn't it appear that there is more of a taper on the top pipe? Notice on the top pipe, how the dies dug into the pipe beyond the actual threads.

    I need to set my dies up so that the indicator line is halfway between 1 1/2" and 1 1/4". I can see undercutting a little sometimes, but that's drastic, I think. -something isn't right. Anyone have any ideas? Do I have the right dies?
    Attached Files
    Last edited by Patti N.; 10-12-2012, 12:07 PM.