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  1. #1
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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
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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?

    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"

  4. #4
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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

  5. #5
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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"

  6. #6
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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

  7. #7
    Join Date
    May 2002
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    San Mateo, CA
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    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.

  8. #8
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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

  9. #9
    Join Date
    Jan 2010
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    Ferndale, WA
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    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.

  10. #10
    Join Date
    Feb 2013
    Location
    Murray KY, USA
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    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.

  11. #11
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    Tyrone, Pennsylvania,USA
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I made one a few years back. The aluminum Is thin and hard to tap so I packed it with JB Weld and has held up good. When using the wax melter the wax at the end of the ball valve cools and will not flow . I use a propane torch to melt the wax in the fitting, works great ,good luck.

  12. #12
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    Mar 2011
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    Polk County, Ar. USA
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    Do you know a machinist? He'll have a NPT tap at home!! Just remember, the size of a standard thread tap is WAY different than the size of pipe thread, and not just because of the taper. For instance, 1/4" pipe is way larger than a 1/4' drill bit. Threads per inch is different also.
    Last edited by ArkansasBK; 03-10-2013 at 08:09 AM.

  13. #13
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    Quote Originally Posted by DC Bees View Post
    When using the wax melter the wax at the end of the ball valve cools and will not flow . I use a propane torch to melt the wax in the fitting, works great ,good luck.
    I've seen that others have experienced this also which is why I was hoping to be able to use the compressed-air fittings; they are male-threaded and eliminate the need for the nipple (keeping the whole fitting warmer).
    Last edited by Ben Brewcat; 03-10-2013 at 08:26 AM. Reason: clarify threading
    Bees, brews and fun
    in Lyons, CO

  14. #14
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    Deknow got it. NPT is not the same. My local Home Depot has NPT taps. I would ask them and if they do not carry them. have them order one.
    Stand for what you believe, even if you stand alone.

  15. #15
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    I am thinking this design woudl be much improved with a bulkhead fitting rather than trying to tap thin metal. this one is 1/2 inch but with a bit of searching I am sure you could find a 3/8 version.
    http://store.homebrewheaven.com/thru...-npt-p728.aspx

    Just keep in mind the heat rating for the seals.
    Stand for what you believe, even if you stand alone.

  16. #16
    Join Date
    Mar 2013
    Location
    Pembina, ND USA
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    33

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

    thanks for the link - they had the 15 gal pots I've been trying to find for my wax melting

  17. #17
    Join Date
    Dec 2012
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    Eva, AL, USA
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    24

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

    McMaster and Carr has them. I order from them almost daily.

  18. #18
    Join Date
    Jan 2007
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    berkshire county MA
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    Default Re: Making a wax melter: : is 16NC thread tap equivalent to NPT?

    got my pipe tap at Aubuchon hardware when I made my presto pot and one for a friend. As was mentioned, the metal is very thin. Tap carefully and keep checking for fit.

  19. #19
    Join Date
    Jun 2012
    Location
    Houston, Texas, USA
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    460

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

    This will probably work. It only needs a hole, no welding, and works with boiling water (beer making).

    http://www.northernbrewer.com/shop/b...valve-kit.html
    Mike
    N5RWH - 9a

  20. #20
    Join Date
    Sep 2012
    Location
    Orange, Texas
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    47

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

    No.
    NC = national couse
    NPT = national pipe thread (which is tapered)

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