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

[jrprich]

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

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[branson4020]

Are you sure its 4mm? Could it be 3.5mm?

 

[jrprich]

Are you sure its 4mm? Could it be 3.5mm?

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.

 

[jrprich]

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

 

[EMP9596]

.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???

 

[MarkAd]

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

 

[EMP9596]

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?

 

[jrprich]

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?

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

 

[jrprich]

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

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

 

[jrprich]

.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???

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

 

[EMP9596]

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..

 

[japeto]

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

m4x0.5 but just tap for 1911 colt screw.