Screw size for a 43in flat screen wall mount - Televison & Video

The 3 most common sizes for the bolts to mount the wall mount to the TV is either M8x20mm or M6x20mm or M4x20 depends on the size of the screen. This site has a chart that will show you what to look for, for your TV M6x20mm TV to Wall Mount Bracket Phillips Bolts Screws Stainless VESA 200

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Contact the authorized dealer for more details about the sizes of hardware. Electro help

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.

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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the TV will mount to the wall via the VESA screw mounts on the back of the LCD. If it is a smaller, monitor sized LCD then the screw pattern will be either 75x75mm or 100x100mm. On larger TVs is it usually 100x200mm. Sometimes the base is screwed into this mount and othertimes to the bottom. Simply unscrew it from the screen. Be sure that the wall mounting kit can handle your LCDs VESA screw pattern, screen size and screen weight.

Metric M5 screws, the wall you buy will be supplying with mounting hardware.
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Just Google " wall mount for xxxxx"

The size is #8-40 X 3/4". This is a specialty screw, so you're screwed

Yes, 2 studs is fine. You might want to goto Home Depot or Lowes and pick a bag of Hilti Toggles. They are toggle that go into the sheetrock and let you mount things to the wall without the need for a stud. They come in a few different sizes so make sure whatever size you buy, that screw fits in the mounts hole. They work very well and I have mounted 50" plasmas using these, with no studs involved. 

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.