Puncture expansion screws, also known as expansion bolts, are a type of anchoring system used in construction and other industries to secure various materials. These screws are designed to expand within a pre-drilled hole, creating a tight fit and a strong hold.
When used with aerated concrete blocks, such as Autoclaved Aerated Concrete (AAC) blocks, puncture expansion screws provide a reliable method of attachment. AAC blocks are lightweight, precast, and have a unique cellular structure that offers superior energy efficiency, fire resistance, and acoustical properties . They are made from a mixture of cement, lime, water, sand or fly ash, and an expansion agent, which is then steam-cured under pressure .
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:
Drilling Tail: The pointed end of the screw allows it to puncture and expand within the material as it is driven in, providing a secure anchor point.
Hexagonal Head: Provides a large bearing surface for use with a wrench, allowing for easy installation and removal if needed.
Zinc Plated: Offers corrosion resistance, which is beneficial for outdoor applications or in environments where moisture is present.
High Tensile Strength: Made from materials like carbon steel or stainless steel, these screws are designed to withstand significant stress without breaking.
Scope of Application
Construction: Used in construction projects for securing materials like formwork, safety barriers, and drywall tracks to concrete or metal structures.
Renovation and Repair: Effective for renovation and repair work where existing structures need to be reinforced or secured with a strong and reliable fastening solution.
Machinery and Equipment Assembly: Used in the assembly of machinery and equipment where a strong and durable fastening solution is required.
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.