Drywall screw
ASTM C1002
Sizes
#6 and #8 gauge, 25 mm to 75 mm long
Drive & head
Phillips - Type W for timber studs, Type S for metal studs
Materials
Hardened steel, black phosphate coated
Strength / grades
Case hardened and brittle - not a structural fastener
Hole and pilot guidance
No pilot hole needed - Type W drives straight into timber, Type S has a point for light-gauge metal studs.
Where it is used
Watch out for
- They snap sideways easily - never use them to hold anything structural or hanging.
- Driving too deep tears the paper face and the board loses its hold.
- Not corrosion resistant - they rust and bleed through paint in damp rooms.