What size are the screw holes for a Panasonic TH-37PX60U

The screws usually come with the mount. The size of the screws depend on the size and weight of the TV so there is no one answer.

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

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.

Call Panasonic customer service and they will provide either the parts or the size and thread type----most of these bolts are common and can be purchased at Home depot etc.

the four holes on rear are for wall mounted bracket, the stand that goes in bottom generally requires the removing of a cover plate which will be about size of the upper part of stand and will be approx four screws, remove cover and stand will slot in and fix with scres/bolts accordingly.

Hello. The best thing for you to do is take your bracket to a hardware store and get the largest diameter screw you can that will fit easily into the holes. Regarding length, you should try to screw into the wooden studs behind the sheetrock or plaster wall so you will want 2 and 1/2 or 3 inch screws. Be sure to drill a pilot hole for each screw but only go in half as deep as the screw is long and use a bit that is only half as big around as the screw is.

any hardware store will have them bring your tv manual with you it will tell you the spec on the screw to connect to the 4 pre existing nuts on the back of the tv as far as from the mount to wall it will be a standard lag bolt small enough to fit threw the hole and long enough to go threw the drywall and about an inch and a half of the studd 2" to 2 1/2" inch lag bolt will work

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

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..