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Does anyone know the grip screw thread size for the Sig P238?

Discussion in 'Maintenance & Gunsmithing' started by jrprich, Mar 17, 2012.

  1. jrprich

    jrprich PNW Well-Known Member

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    I searched Google and several forums and found lots of posts but no answer. :huh:
    Does anyone know the grip screw thread size for the P238? I tried 4mm and the threads are too coarse so it must be a special size, figures.

    Thanks,
    Jim
     
  2. branson4020

    branson4020 Forest Grove, OR Active Member

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    Are you sure its 4mm? Could it be 3.5mm?
     
  3. jrprich

    jrprich PNW Well-Known Member

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    No I am not sure. I just mentioned 4mm as 3 was way too small and 5 way to big. The grip screw will start in a 4mm nut but just. When you compare the threads on a 4mm machine screw to the P238 screw it is obvious that the P238 screw has more threads per inch. I am not even sure if the P238 screw is metric.
     
  4. jrprich

    jrprich PNW Well-Known Member

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    DUH.......the P238 grip screws are the same thread as that of a 1911 but about 1/2 as long.
    I tried a screw from my 1911 grips on my 22/45.
    Now all I need to do is find out what the 1911 grip screw thread size is.
    A member on the Sig forum sent me a PM that the 1911 size is .150"-50. If this is incorrect, please post up.
    So I guess I will look on McMasters for some SS screws the length of the P238 screws.
    Hmmm, McMasters doesn't list any screws in these sizes
     
  5. EMP9596

    EMP9596 Two Trees West of Camas, WA. Active Member

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    .150" - 50 x .250 is standard for a 1911's as above.

    I prefer and use small "O" rings on my grip screws to keep them from backing out.

    Blue lock-tite works also.

    Might be something you already know???
     
  6. MarkAd

    MarkAd Port Orchard Well-Known Member

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    Not being a machinist I would grab a thread gage and check the thread size.
     
  7. EMP9596

    EMP9596 Two Trees West of Camas, WA. Active Member

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    Ment to add and forgot.

    Not sure where you live but the Parkrose Hardware store here in East Vancouver now carries a good assortment of gun screws. (Brownell's Assortment)

    I am not sure of the Portland store though?
     
  8. jrprich

    jrprich PNW Well-Known Member

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    Thanks for the tip on Parkrose HW, I will call the Portland store to see if they have a gun screw assortment.
     
  9. jrprich

    jrprich PNW Well-Known Member

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    I did, but my thread gauge doesn't have one that matches
     
  10. jrprich

    jrprich PNW Well-Known Member

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    Thanks, I am not losing screws, I was just looking for some options like stainless.
    I haven't found the right size O rings yet. I tried some that were 1/4"OD, 1/8"ID but were too thick for the short grip screws on the Sig P238. I thought about Loctite but I remove my grips often during cleaning
     
  11. EMP9596

    EMP9596 Two Trees West of Camas, WA. Active Member

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    I found little-itty-bitty ones at the Parkrose Hdw over here. ID = 3.50mm x OD = 4.80mm and the material is about 1.50mm in diameter if my memory is working correctly? A micrometer is not real accurate on rubber or silicone...

    I need to pick up some more now that I think of it..