. Drywall screws were designed with 'bugle' heads (looking at them sideways, they resemble a bugle shape) which allows them to countersink and the head are flush with the drywall versus standard flat heads which, when viewed sideways, are shaped like a 'v' underneath the head.
They come with three different type of threads - fine or coarse thread, and fine with a drill tip The fine thread with drill tip is designed to be used with steel studs and the regular fine and coarse thread were designed to be used with wood studs.
You can use drywall nails or drywall screws. I prefer the screws.
You can use drywall nails (ridged) or drywall screws. I am not a drywaller, but have done lots of it and prefer the screws.
Commonly #6 gauge.
About 4 grams.
20
Regular drywall primer.
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.
Yes, that is exactly their purpose.
They evolved in the 1970's .
A Phillips is a screwdriver with a cross shaped, pointed head. There are 4 regular sizes and also at least 2 variations. -The Pozidrive is slightly different and grips #2 screws better. The Drywall bit is even better,giving a very positive grip on #2 drywall screws due to a harder, sharper edge.