Mount screw size

To know more, you have to download the service manual to this set.
http://electronicshelponline.blogspot.com/

Not sure what you are asking. Are you looking for the screw for the attaching the mount to the TV or the mount to the wall.
If you are looking for the screw size for the back of the TV, it could be metric size M6 or M8. Just be careful of the length. Too long and you will ruin the TV. Maybe google the TV model and it might show in the owner manual the exact screw to use.

The mount will come with several different sizes of screws so you can choose the correct ones.

This set is actually LG and have seen this question before on those--a quick call with the model number will give you the answer from Zenith--they are standard bolts available from Home Depot etc.

Metric M5 or M6, when you buy wall mounting bracket, it will came with a bag of screws for attaching the TV to the bracket. All my wall mounting brackets for my TV come with screw.

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WHAT SIZE SCREWS DOES A SAMSUNG TV LN52A65 REQUIRE FOR THE TABLE TOP MOUNT

Just check the weight and size restriction on the wall mount. As long as the weight and size specs of the TV fall within those allotted by the wall mount, you should be fine.

The screw holes are metric. The set is supplied with M5x25 screws to attach the pedestal, so the wall mount screws will be in that same range.

You will 4 m5x18mm and 4 m5x25mm machine screws. That should do the trick..