questionsdoes anyone know the size of the screws needed to…

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Does your tv have the universal VESA mount (4 holes an equal distance away from each other, forming a square)?

If so, it most likely uses the universal mounting screws which are included in most television mounts.

If they were not included, these are universal VESA replacements.

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My TV claimed they would come with the wall mount, and vice versa. I ended up picking mine up at a local Tru Value, just in the metric screw section. I looked up the spec online to find the size.

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Not sure the bolt sizes but any useful TV mount will include a plethora of hardware to ensure you can connect your TV to the mount. I bought a cheap Rosewill mount for $20 shipped that came with all the hardware (now $30)
http://www.newegg.com/Product/Product.aspx?Item=N82E16882021208

They have this thing for $12, free shipping, if you want to mount it flat to the wall... Also includes all of the hardware.
http://www.newegg.com/Product/Product.aspx?Item=N82E16882021210

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m6 choose your length based on what your mounting it to min is 20mm