Screws are fasteners used to join materials together by being driven into them, typically with a screwdriver or drill. Screws are designed with a helical ridge (thread) that allows them to grip materials securely.

Types of Screws

• Wood Screws – Used for fastening wood, featuring coarse threads and a tapered point.
• Machine Screws – Designed for use with nuts or tapped holes, often with a uniform thread.
• Sheet Metal Screws – Have sharp threads for securing metal sheets or plastic.
• Drywall Screws – Used for attaching drywall to studs, often with a black phosphate coating.
• Deck Screws – Rust-resistant and designed for outdoor decking.
• Self-Tapping Screws – Cut their own threads into material, eliminating the need for pre-drilling.
• Lag Screws (Lag Bolts) – Heavy-duty screws used for securing large structures like decks or beams.
• Metal Panel Screws - Cut through metal panels and include a water-tight colar.

Common Screw Head Types

• Flat Head – Sits flush with the surface.
• Phillips Head – Cross-shaped drive for better grip.
• Slotted Head – Single straight groove for a flathead screwdriver.
• Torx Head – Star-shaped for better torque resistance.
• Hex Head – Requires a wrench or hex key (Allen wrench).