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Old February 23, 2013, 05:13 PM   #1
BerdanSS
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Size of CVA ML scope mount screws?

Does anyone know the size of the scope mount screws for a CVA staghorn?


<EDIT> Just went to menards and bought one from 3mm-6mm and 8-10 32.

The 4mm fit pretty good

Last edited by BerdanSS; February 23, 2013 at 08:17 PM.
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Old February 24, 2013, 05:03 PM   #2
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The scope mount screws are 8-36 and made of hardened steel. That is a UNF (unified thread FINE) standard size, not UNC (Unified thread COARSE), which is what most hardware stores sell. It is finer so that recoil doesn't loosen them as easily.

4 mm screws have a 0.7 mm pitch standard, which is 36.3 turns per inch, and is why that 4 mm screw seemed to turn in OK. It will be compressing the receiver threads a little. The 4 mm screw is a little narrower. The tables in my copy of Machinery's Handbook suggest a minimum dimension 4 mm screw in a maximum dimension 8-36 female thread will engage about 1/3 less thread than the right screw does, so it will be a weaker attachment and pulling on the receiver threads harder. Also, the 4 mm screw may not have the same heat treatment as the right scope screws, so it also risks breaking off in the holes. I would not be trusting it, personally, and would get the right screws.

If you call CVA, they might send you some of the right ones. 770-449-4687.
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Old February 25, 2013, 01:44 AM   #3
BerdanSS
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I will eventually get some of the OE screws..in the mean time I'm not mounting a scope, just dealing with set screws to fill the scope mount holes of a used rifle I bought that was missing all of them. Thanks for the number, I'll call them tomorrow and see if I can get an owners manual as well
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Old February 27, 2013, 04:19 PM   #4
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Sure enough....called them and they have a new set of screws and a owners book for it on it's way, free of charge

Thanks again for the number sir!
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Old February 27, 2013, 04:57 PM   #5
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I thought that might happen. Glad it worked out for you.
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