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  1. #1
    Join Date
    Oct 2004
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    Lyons, CO
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    Default Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I'm making a wax melter a-la http://www.candletech.com/general-in...lf-wax-melter/ presto pot. I went to get a thread tap and all Home Despot had is a "16NC" tap set in 3/8". Will this tap threads for regular NPT fittings like a regular brass plumbing fitting?

    Do the compressed-air fittings (there's a nice 3/8" full-port valve with male threads, where most fo the other ball valves have female on both ends) have the same thread count as NPT or this die, or do I need to use plumbing fittings only?
    Bees, brews and fun
    in Lyons, CO

  2. #2
    Join Date
    Jul 2006
    Location
    Worcester County, Massachusetts
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I think the NPT is a tapered thread....the NC is not.

    deknow
    The irony is free. It's the sarcasm you are paying for....ironically.
    -Felicity Jones in "Chalet Girl"

  3. #3
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    Dangit, I figured. Can it be that HD doesn't carry threading taps? I guess I can look around for plumbing supply places, but sheesh this should be easier .

    Wait, I wonder if the bind (we're talking super-thin aluminum wall here) would be OK to seal anyways?
    Bees, brews and fun
    in Lyons, CO

  4. #4
    Join Date
    Jul 2006
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    ...you might check Amazon.

    deknow
    The irony is free. It's the sarcasm you are paying for....ironically.
    -Felicity Jones in "Chalet Girl"

  5. #5
    Join Date
    Oct 2004
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    Lyons, CO
    Posts
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    This air ball valve for example; is air NPT?

    B
    SP air ball valve
    Last edited by Ben Brewcat; 03-09-2013 at 08:28 PM. Reason: fix link
    Bees, brews and fun
    in Lyons, CO

  6. #6
    Join Date
    Oct 2004
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    Yeah, I'm looking at this one but wanted to make it this weekend. Plan ahead right ?
    Bees, brews and fun
    in Lyons, CO

  7. #7
    Join Date
    Jan 2010
    Location
    Ferndale, WA
    Posts
    5

    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I believe NPT is National Pipe Thread and NC is a coarse thread and not tapered as a pipe thread is.

  8. #8
    Join Date
    Feb 2013
    Location
    Murray KY, USA
    Posts
    263

    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    JB Weld to seal and treat it like a bulkhead? That way you're basically sandwiching the aluminum and not relying on it to hold its thread. Just a thought.

  9. #9
    Join Date
    Jul 2006
    Location
    Worcester County, Massachusetts
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I just reread your post...I think I did exactly that a few years ago for a presto pot. My recollection is that it worked, but the fitting didn't thread all the way through...a bit fragile, but workable.

    deknow
    The irony is free. It's the sarcasm you are paying for....ironically.
    -Felicity Jones in "Chalet Girl"

  10. #10
    Join Date
    May 2002
    Location
    San Mateo, CA
    Posts
    4,881

    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I see some on EBAy that are JB Welded in. I have the tap I used, I could look tomorrow what it is.

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