Socket Head Screw is a special type of screw that differs from other head drive types such as Phillips and slotted screws. They feature a built-in hexagonal internal drive that can be tightened and loosened by a socket wrench (or hex key). This makes them ideal when there is limited side clearance and where the head needs to sit flush with or just below the surface, as is common in a range of modern construction applications such as machine parts, die fixturing and clamping.

They also have a lower profile than bolts, which allows them to be placed closer together and are suitable for applications with tight tolerances. They are also often preferred when there is a requirement for a high load bearing surface, such as shaft collars or crash bars on exit doors.

Hex Socket Cap Screws are available in a wide variety of sizes, materials and finishes to suit most applications. They are often used in industrial production lines, furniture manufacture, steel fabrication and other heavy duty environments for their impressive load-bearing capabilities, versatility and discreet aesthetics.

Typically, they are made from alloy steel or stainless steel, although other options can be found such as brass, aluminium and zinc-plated socket cap screws. They are usually hardened to RC 45-53 or higher. There are many variations within this type of screw to meet most requirements, including cup, flat and dome style heads, with varying hex socket widths. Some also feature a nylon patch or insert that adds locking strength and resists loosening from vibration.