everything including 5/8 drywall only requires 1 1/4 length drywall screws. you put them in 16 inches apart on the studs and in the center the same distance apart.
I put mine 16" apart in studs
I use 16 inches all over.
If you drywall on 16" on-centre studs, with sheet length perpendicular to the studs, and screw the two outside length edges at 6" spacing (as it should be) and the two interior studs at 12" spacing, the answer is 48 drywall screws per 4'x8' sheet.
You can use drywall nails or drywall screws. I prefer the screws.
Drywall anchors should be placed no more than 16" apart. On a 20 foot wall you should place approximately 15 drywall anchors.
It depends on your local area (check with your building inspector) however, as a rule of thumb: Space screws a maximum 12" apart for ceilings and 16" apart on walls.
You can use drywall nails (ridged) or drywall screws. I am not a drywaller, but have done lots of it and prefer the screws.
The spacing is VESA 100, 200 or 400 mm spacing.
Commonly #6 gauge.
About 4 grams.
20
Metal drywall screws are usually fit with a small plastic pre-grooved sheath which taps the screw into the drywall and wooden beam behind it. This results in a clean and secure penetration of the wood for each screw.
The most commonly used are #6.
No, they are adequate for many uses.