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.
Quality Certification
Hebei Bentley is ISO9001:2015 certified and equipped with relevant certificates for quality assurance. Due to its specific dimensions and performance levels, it is suitable for a wide range of industrial and commercial scenarios including, but not limited to: machine building, construction work, transport, energy industry, timber frame connections.
Quality inspection
Bentley has invested a huge amount of money to builda product testing laboratory, equipped with importedhigh-end instruments:such as thread comprehensivescanners, high temperature tensile testing machines,high frequency fatigue testing machines, etc., to ensurethat all products are strictly tested before leaving thewarehouse to ensure the reliability of customers duringuse.
