Cup Head Bolts

A Cup Head Bolt, also commonly known as a Carriage Bolt or Coach Bolt, is a type of fastener widely used in timber construction and various other applications. 

Key Features and Design

Cup head bolts are distinctive due to their unique head and neck design:

• Head: They feature a shallow, smooth, and rounded or dome-shaped head (a "cup head" or "mushroom head"). This low-profile design is often chosen for aesthetic reasons or safety, as it minimizes protrusion and prevents snagging, making it ideal for surfaces like decking, steps, or furniture.
• Neck: Directly beneath the head is a square section (or sometimes knurled or finned). This is the key feature that distinguishes it from other bolts.
• Shank: The rest of the body is a threaded shank, designed to be secured with a matching nut and sometimes a washer.

Common Uses

Cup head bolts are highly versatile and are often used for:

• Wood to Wood Fastening: Joining two pieces of timber together.
• Wood to Metal Fastening: Connecting metal components to wooden structures.
• Timber Framing: Structural support in buildings.
• Outdoor Applications: Fencing, retaining walls, and outdoor furniture where the smooth head offers a better finish and safety.
• Security: In some applications, the smooth, domed head can offer a degree of tamper resistance since there is no slot or external driving feature (like a hex head) to grip with a standard tool from the head side.

Canterbury Timbers has wide variety of Cup Head Bolts. If we don't have it, Canterbury Timber can source it for you. Talk to our experts for DIY advice and construction project knowledge. Canterbury Timber offers competitive Trade Prices on Timber and Building Supplies.

Call us today on 1300 791 229 or click here for a Quote.