Mild steel self colour cup square bolts, often known as carriage bolts, provide a reliable fastening solution for timber construction, fencing, joinery and general-purpose applications. These bolts feature a smooth domed head and a square section beneath the head that bites into timber to prevent rotation during tightening. The self colour finish is ideal for components that will be painted, coated or used indoors away from corrosive environments.

Typical uses include wooden gates, fencing panels, furniture assembly, landscaping structures, agricultural equipment and general joinery work. When paired with matching nuts and washers, cup square bolts deliver secure clamping and a clean, low-profile appearance. Their combination of simplicity, strength and ease of installation makes them a popular choice across a wide range of timber-based projects.