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Threading 1/8 NPT

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  • Threading 1/8 NPT

    I have a need for a bushing/coupler/adapter thing with 1/8 NPT on one end and 10-32 on the other. Both male. Haven't found anywhere to buy one yet, but that got me wondering how tapered threads get cut in the 1st place. Can I make my own?

    SP

  • #2
    1/8 27 is standard pipe tap available at any hardware store, it is a tapered tap requiring only a standard clearance hole to be drilled.

    All sizes of taper pipe threads can be cut on a lathe with a taper attachment (tiny ones are easier to tap though).

    Taper PipeTaps can be made as well with a taper attachment....
    Last edited by Bguns; 11-13-2007, 04:13 AM.

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    • #3
      Npt

      Many of the tap and die sets have the 1/8 NPT tap and die included. Take a look at your set and you may find that you already have it.

      Doug

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      • #4
        Originally posted by Mosside
        Many of the tap and die sets have the 1/8 NPT tap and die included. Take a look at your set and you may find that you already have it.

        Doug
        Yea, I got a cheap taps/die set and there are a few smaller pipe types in mine. My set was a Harbor Freight special, the good set
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        • #5
          Hmmm, I don't think you will find that adapter on any parts shelf. I hope you want it made in brass as that would be easier. All you need is a lathe and assorted tooling, a 10-32 die, a 1/8-27 pipe die and some material to make it from.

          Sounds like a fun project. Have you started yet? Why not?
          It's only ink and paper

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          • #6
            www.clippard.com they use a lot of 10-32 porting on their products, i know they have adapters to the 1/8 npt, but if exactly as you need i don't know. Good Luck

            dave

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            • #7
              You will find what you are looking for here:

              http://store.microgroup.com/products_configurator.cfm

              I used the confurator and got a part number of MP125/MT1032

              I do not know what it would cost you though.
              Paying Attention Is Not That Expensive.

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              • #8
                I'd get a 1/8 NPT coupling and a 1/8 NPT plug both brass. Solder the plug in the coupling. Machine off the driving square. Drill and tap for 10-32 UNF.

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                • #9
                  How about an adapter with 1/8 TPT (male) on one end, and a 3/16 tubing connection on the other. Chuck the hex part carefully in the lathe and turn the tubing end down to correct diameter and re-thread with a 10/32 die. You ought to find such an adapter from Johnstone Supply among others. Probably can find it at local hardware store or auto parts store.

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                  • #10
                    Thanx for all the responses guys. I kept at it with the McMaster online catalog and eventually found a reducer that has an 1/8 male NPT with a 10-32 female inside. Needing a male 10-32 I got a straight coupler, (male on both ends), to screw into the reducer. 2 parts when 1 would do but Mickey stops by here every now and then too.

                    It'll work and thanx again.

                    SP

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                    • #11
                      Just wondering how many of you can cut 27 tpi with your quickchange lathes? I can't on any of the 3 qc lathes I've got.

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                      • #12
                        Originally posted by heavysteamer
                        Just wondering how many of you can cut 27 tpi with your quickchange lathes? I can't on any of the 3 qc lathes I've got.
                        Not too many without change gears. At work I can cut whatever I choose without changing any gears. That's nice.
                        Paying Attention Is Not That Expensive.

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                        • #13
                          Yup my QC won't ....

                          But the old South Bend will in about 5 minutes, and will get my fingers greasy to boot..

                          Handy having 2 lathes...

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                          • #14
                            dam!! Made me look! And in the middle of the night, too!

                            Nope. Closest I could readily see was 26.8+ or 27.3125 tpi

                            but I didn't check everywhere.

                            You're gonna force me to make a full set of thread charts! but not tonight

                            uute
                            Last edited by uute; 11-14-2007, 05:29 AM.

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                            • #15
                              The South Bend extended range QC gear box hand 27 threads per inch. With the non extended gear box it was necessary to add one gear to the gear train to cut 27 tpi. I have the South bend part number for which gear was needed for which gear box for all their different size lathes if any one is interested. Gary P. Hansen
                              In memory of Marine Engineer Paul Miller who gave his life for his country 7-19-2010 Helmand Province, Afghanistan. Freedom is not free, it is paid for with blood.

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