Countersunk Hexagonal Internal Expansion Bolts are manufactured in accordance with DIN EN ISO 10642 and have metric thread diameters ranging from M3 to M20, making them suitable for a wide range of installation requirements. They are usually supplied with a hexagonal socket hole and require the use of a hexagonal key (also known as an Allen key) for installation. The design of these bolts allows the head to be recessed into a corresponding countersunk hole, providing a smooth, bump-free installation. Typically, these bolts are fully threaded, but sometimes certain stock may contain partially threaded bolts.

Stainless Steel (304/316): Offers superior corrosion resistance and is suitable for moist or corrosive environments. The 316 grade has additional molybdenum, providing even better corrosion resistance, especially in marine applications.

Carbon Steel: Provides good strength and is the most common material for bolts. It may require additional surface treatments like galvanizing for increased corrosion resistance.

Alloy Steel: Offers enhanced strength and durability. It is often used in high-stress applications where high tensile strength is required.

Advantage:

Aesthetics: The countersunk head design allows the bolt to sit flush with the surface after installation, providing a neat appearance.

High Strength: The hex drive section allows for greater torque to be applied with a wrench or power tool, making it suitable for high load applications.

Quick Installation: Expansion bolts are quick and easy to install, improving construction efficiency.

Wide applicability: Suitable for a wide range of materials, including concrete, brick and wood.

Corrosion resistance: Some models are made of stainless steel, making them suitable for wet or corrosive environments.

Scope of Application

Building structure fixing: for fixing windows, door frames, brackets and other building components.

Machinery and equipment installation: fixing machine bases, pipes and other equipment to ensure their stability and safety.

Furnishing and decorating: for fixing decorations on plasterboard walls, hanging objects and installing furniture, etc.

Electrical and plumbing systems: fixing wire channels, pipes and fittings.