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spencerin
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# Posted: 1 Jan 2024 04:57pm
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Anybody know what the shear strength of a #8 1 1/4" deck (green-coated) screw is? I googled it but of course got multiple, wildly different answers.....
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ICC
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# Posted: 1 Jan 2024 09:02pm - Edited by: ICC
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Most deck screws are not load rated so should not be a surprise to find little to no or conflicting info on their shear load rating. And that is why it is not a great idea to use deck screws where they may be subjected to shear loads.
Simpson is the only brand I know of that sells a load rated deck screw. They are tested for both shear and withdrawal loads. Simpson Deck-Drive DSV wood screws is the name. I have used the #10 in assorted long lengths (2.5 to 4") but I believe they make some #8 in shorter lengths. Search the Simpson website for info. Simpson does publish all the relevant data for their products. I don't have very fast data with my current cell service and have limited bandwidth, otherwise, I'd try to find a link. If you can find suitable DSV screws on HomeDepot they usually have data links in the specifications section for the screws.
-izzy
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gcrank1
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# Posted: 1 Jan 2024 09:34pm
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Ive been using SPAX screws for years but never looked for shear ratings. What I do know is Ive never had them break on anything Ive used them for.
I buy them at Menards; they take a special driver tip (Torx?). Never stripped a head out either.
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ICC
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# Posted: 1 Jan 2024 09:42pm
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There ya go, another option. I've heard of Spax and do believe they are structural load-rated but I've never seen any in the West.
-izzy
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Brettny
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# Posted: 2 Jan 2024 08:34am
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In all reality a 1 1/4in screw can really only fasten something maybe 1/2in thick. Anything 1/2in thick isnt structural. 1.25in screw is really just a short trim screw.
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