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.
