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Can someone tell me the difference in these two threads

Discussion in 'Technical Chat' started by elblako91, Jun 7, 2011.

  1. Jun 7, 2011 at 8:00 AM
    #1
    elblako91

    elblako91 [OP] Well-Known Member

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    On the left is my stock oil pressure gauge. On the right is a brass adapter i ordered. Both are M10-1.0 The adapter is a hair larger and begins to screw in the thread but then starts to cross thread. I don't understand why if they are the same size? :confused:

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
  2. Jun 7, 2011 at 8:01 AM
    #2
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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    the one on the left looks like it tapers, starts small and gets wider. the one on the right looks to be the same diameter for the length of the threads
     
  3. Jun 7, 2011 at 8:06 AM
    #3
    horwitzs

    horwitzs Well-Known Member

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    Correct.
    The one on the left is pipe thread, a.k.a. NPT.
    It has a taper so it starts in easy then tightens up really well as the tapers come together.
    A decent sized hardware store should have lots of brass fittings with different thread types so you can find what you need.
     
  4. Jun 7, 2011 at 8:06 AM
    #4
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

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    x2, could just be the camera but the one of the left appears to be a tapered bolt as Zombie Runner said. If it don't fit, don't force it!
     
  5. Jun 7, 2011 at 8:14 AM
    #5
    mjohn617

    mjohn617 Well-Known Member

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    NPT, you should be able to find that at Home Depot
     
  6. Jun 7, 2011 at 8:15 AM
    #6
    elblako91

    elblako91 [OP] Well-Known Member

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    Here is a better picture of the stock sender. It does look like it tapers but only towards the last part of the threads and not at the beginning hmmm...

    [​IMG]

    [​IMG]
     
  7. Jun 7, 2011 at 8:16 AM
    #7
    pudge151

    pudge151 Well-Known Member

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    yup its pipe thread, tapered. the new one is not
     
  8. Jun 7, 2011 at 8:18 AM
    #8
    4WD

    4WD cRaZy oLdmAn

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    The brass fitting is for a feral or compression fitting
     
  9. Jun 7, 2011 at 8:24 AM
    #9
    elblako91

    elblako91 [OP] Well-Known Member

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    So what i need is a NPT M10-1.0 to SAE adapter? I will be putting in a nylon tube on the SAE side of it for my oil pressure. Will this work?
     
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