What Is A Screw Thread?

A screw thread is a helical ridge or groove that is wrapped around the outer or inner surface of a cylindrical or conical object, such as a bolt, screw, or nut. The thread is designed to match with a corresponding thread on another object so that when the two objects are turned or screwed together, they will become securely fastened.

Self-Threading vs Self-Tapping Screws: What's the Difference?

Self-tapping screw: These screws feature a sharp point that can cut its own threads as it's driven into the material. They're designed to be used in materials that are already softer than the screw material, such as wood, plastic, or sheet metal.Self-drilling screw: These screws have a drill bit-like end that can drill its own hole as it's driven into the material. They're designed to be used in harder materials like metals, as they can cut through the material without the need for a pre-drilled hole.

What Is The Difference Between A Fastener & A Fixing?

A fastener joins two formerly separate components together while fixing is more a method of securing an object in place. It refers to the process as opposed to the actual component.

What Is The Black Coating Often Seen on Drywall Screws?

The black phosphate coating that can be seen on a common drywall screw is not just a cosmetic feature, it actually serves a functional purpose. Drywall screws owe their black colour to their phosphate coating which protects the metal from rusting. This corrosion resistance is most common in coarse threads as they're typically used to apply plasterboard to timber, an application which presents a higher risk of damp and rust.

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