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Need help with NPT tap

Discussion in 'The Garage' started by sandawgk5, Nov 18, 2006.

  1. sandawgk5

    sandawgk5 3/4 ton status

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    I am gettting ready to "machine" my steering box for Hydro Assist and I am a little concerned about tapping the holes. The tap is tapered so how far do I tap the hole to get a proper seal on the fitting. I know if I run the tap all the way through then it the threads will be too large and will not seal. Need to know a thumb rule for running NPT threads. I saw somewhere if you leave 5 threads at the top of the tap that is the right depth. Any help or advice is appreciated. Oh I am tapping the top cap and I have a billet end cap from JKWOffroad.

    Ira
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The rule of thumb is three full turns for a fitting to go snug. Grab a fitting and use the trial and error method. If you can spin it in by hand three turns it's all good.

    Rene
     
  3. sandawgk5

    sandawgk5 3/4 ton status

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    OK so go slow and take my time and test fit after I cut a couple threads ( a couple being 2 or 3):D.

    I figured there was no steadfast rule for us non machinist types:D

    Thanks Rene

    Ira
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Yeah, it's a lot easier to go slow...because once it's too deep you're screwed. :doah:

    Rene
     
  5. sandawgk5

    sandawgk5 3/4 ton status

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    Readymix has a spare top cap but I would just as soon not use it if I dont have too:D.

    Ira
     
  6. readymix

    readymix 3/4 ton status

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    Actually I was going to tap it today to see if I would screw it up. I dont have the 3/8NPT to JIC-6 fitting though.
     
  7. sandawgk5

    sandawgk5 3/4 ton status

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    Neither do I I need to pic some up. Just need 2 for each of us ya?

    Ira
     
  8. readymix

    readymix 3/4 ton status

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    2EA....total of 4.

    I might just get a piece of 3/8 NPT from Lowes today. I need to go there anyway for some home improvment crap. I'll let you know if I get to try the tap out.

    Still waiting for word from the wife about tomorrow. Hopefully I can get free and we can finish the hydro install.......
     
  9. sandawgk5

    sandawgk5 3/4 ton status

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    Yep I am going to my bro in laws (he has NFL Ticket) to get my drink awn today:D. Just give me a call when the warden issues a pardon:haha:. Mine is in the air right now:D. Does Lowes sell NPT to -AN fittings?

    Ira
     
  10. readymix

    readymix 3/4 ton status

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    Nope
     
  11. sandawgk5

    sandawgk5 3/4 ton status

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    Trying to go through my head of who sells them and would be open today. I might have to go tomorrow on the way home.

    Ira
     
  12. readymix

    readymix 3/4 ton status

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    Any hydro shop. There are about 100 places between here and SD that have them.
     
  13. sandawgk5

    sandawgk5 3/4 ton status

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    I should be able to go to any hydraulic shop and pic up a couple of fittings eh? Are we just gonna run straight fittings on each end since the hose ends are 90s?

    Ira

    Edit: Damn you beat me. I have that one right by my house I should go check.
     
  14. readymix

    readymix 3/4 ton status

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    Yeah the straight adapters is what I was planning on
     
  15. sandawgk5

    sandawgk5 3/4 ton status

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    All right I will see if I can get some on the way home. Who knows maybe I have some at work:D.

    Ira
     

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