DRY WALL SCREW

Product Specification :
A Drywall Screw is a specialized fastener designed specifically for attaching sheets of gypsum board (drywall) to wood or metal studs. They are engineered with a sharp point and specific thread patterns to drive quickly without tearing the paper facing of the drywall.
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1. Key Design Features
Bugle Head: The most distinctive feature. The curved, countersunk head allows the screw to sink slightly into the drywall without tearing the paper surface, creating a "dimple" that can be easily filled with joint compound.
Drive Type: Almost exclusively #2 Phillips drive.
Point Type: Sharp Point (Type S) for wood or light-metal studs, or Self-Drilling Point (Type S-12) for heavy-gauge metal.

2. Thread Types & Applications
Thread Type    Description    Best Use
Coarse Thread    Wide-spaced threads; provides superior holding power in wood.    Attaching drywall to wood studs.
Fine Thread    Closely spaced threads; designed to cut through metal.    Attaching drywall to metal studs.
High-Low Thread    Alternating high and low threads for increased pull-out resistance.    Thicker materials or plastic anchors.

3. Material & Finish
Drywall screws are usually made of hardened steel and feature specific coatings to prevent corrosion from the moisture in joint compound:
Black/Grey Phosphate: The standard finish. It provides a good "key" for joint compound and paint to bond to, though it offers minimal rust protection.
Zinc Plated: Offers better corrosion resistance; used in damp environments.
Ceramic Coated: Used for exterior applications (though "deck screws" are usually preferred for outdoor work).

4. Dimensional Standards
Standard Diameters: Usually #6 or #8 gauge.
Common Lengths:
1-1/4" (32mm): The industry standard for 1/2" drywall on wood studs.
1-5/8" (41mm): Used for 5/8" drywall or double-layer applications.
2" to 3": Used for attaching drywall to thicker insulation or multiple layers.

5. Installation Performance
Depth Control: For a professional finish, the screw must be driven so the head is $0.5\text{mm}$ to $1\text{mm}$ below the surface. If it breaks the paper, the screw loses most of its holding power.
Spacing: Typically spaced every 12 inches on walls and 8 to 12 inches on ceilings.