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Holding strength of wood screws based on screw size, thread engagement, and type of wood i.e., hardwood or softwood Question
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Posted by: john2003

06/18/2006, 21:55:49

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Hi everyone,

Does anyone know a general formula or rule of thumb for calculating the holding strength of a wood screw based on it's size, depth of thread engagement into the wood, and the type of wood, i.e., hardwood or softwood ?

I am screwing a small .156" thick flat steel plate to wood with nine #6 flat head sheet metal screws. I want to use a 1" long screw which will give me .844" of thread engagement into the wood. I will be screwing into edge grain and not end grain.

I am mainly interested in tension, but if you have info on shear I am interested in that as well.

I will probably use softwood, but am also interested in data for hardwood.

I would appreciate any feedback.

Thanks
John







Modified by john2003 at Sun, Jun 18, 2006, 21:57:06


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Re: Holding strength of wood screws based on screw size, thread engagement, and type of wood i.e., hardwood or softwood
Re: Holding strength of wood screws based on screw size, thread engagement, and type of wood i.e., hardwood or softwood -- john2003 Post Reply Top of thread Forum
Posted by: randykimball
Barney
06/19/2006, 21:45:27

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John,
If I were doing a project of any value and of the nature you are doing,... with seemingly little data to draw on.. I would:

Have a shackle built to a plate of some dimension and place four of the same screws, one in each corner, into a sample of the expected typical wood, then have done or do a load test and establish my own REAL data. If you get a certification lab to do the pulls you can get your data certified.





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