Countersunk bolts

Countersunk bolts are commonly used in places where a smooth, flush surface is needed once the bolt is installed. You'll find them in timber framing, door hardware, and structural steelwork, especially where protruding bolt heads would interfere with finishes or fittings. Unlike standard hex bolts, countersunk bolts have a flat head that tapers into the material, allowing for a flush finish. They’re secured with a matching nut or threaded directly into tapped holes, depending on project requirements.

Available in a variety of materials including zinc-plated steel, stainless steel, and brass, countersunk bolts come in both metric and imperial thread sizes. Builders can choose between slotted, hex drive, and Torx head types depending on the torque or security needed. In modern construction, these bolts are often used for securing metal plates, fixing framework, and attaching fittings in high-load or visible areas. Their precise fit and clean finish make them a staple in both first and second fix work.

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