Wood thread drywall screws (coarse thread)
Thread: Coarse, wide pitch Use: Fasten drywall to wood studs joists
Feature: Quick penetration, strong holding power in wood
Metal thread drywall screws (fine thread)
Thread: Fine, narrow pitch
Use: Fasten drywall to light gauge steel studs
Self drilling drywall screws Built in drill tip Use: Directly drill into thin metal without pre drilling
Bugle head (standard): Rounded countersunk head, most common; does not crack drywall paper
Flat head: For heavy duty applications
25 mm (1 in): Thin single layer drywall
32 mm (11/4 in): Most standard interior drywall
38 mm (11/2 in): Double layer drywall or thicker board
45 mm(13/4 in): Ceiling drywall or heavy duty
Installation Tips Drive the screw head slightly below the drywall surface (dimpled), not breaking the paper
Differences from Ordinary Wood Screws Thinner shank, sharper point, finer threads