Expansion bolts function via a mechanical expansion mechanism that creates high friction within a drilled hole,ensuring a secure anchor in concrete.They are available in materials like carbon steel or stainless steel,offering different corrosion resistance levels.The hot-dip galvanized surface finish enhances durability for outdoor and damp environments.Head styles vary,including hex heads for tool access and round heads for concealed installations.These bolts possess high tensile and shear strength,capable of withstanding static and dynamic loads.Installation is straightforward,requiring only drilling,insertion,and tightening,with no need for adhesives.The expansion sleeve,often made from zinc alloy or plastic,provides uniform stress distribution.Additionally,their adjustability and,in some designs,reusability make them practical for repair and renovation projects.Overall,expansion bolts are a preferred choice for construction anchoring due to their reliability and versatility.
Expansion bolt specifications follow DIN 7990 or ISO 898-1 standards.Diameters range from M8 to M16,and lengths from 50mm to 200mm;for example,common lengths for M10 bolts are 80-120mm.Threads are partially threaded,with the anchor segment typically comprising one-third of the total length;pitch is adjusted per diameter(M10 pitch is 1.5mm).Head dimensions,like the across-flats width for an M10 hex head,is 17mm.Surface treatments include hot-dip galvanizing(coating thickness 12-15μm)or electroplated zinc,providing corrosion resistance for over 500 hours in salt spray tests.When made from carbon steel,the strength grade is Grade 4.6,with a minimum tensile strength of 70,000 PSI and hardness of HRB 70-100.The expansion sleeve's inner diameter matches the bolt,expanding by 50%-100%in diameter upon installation.Packaging usually includes bolts,nuts,and washers,in sets of 10 or 50 pieces.
Expansion bolts are widely applied in building structures,infrastructure,and household installations.In construction,they fix steel beams,railings,and pipe supports to concrete walls or floors.Infrastructure projects like bridges and tunnels use them to anchor lighting systems or safety equipment.In residential settings,they are common for mounting cabinets,shelves,and air conditioning units,providing reliable support.Industrially,they are used for machinery foundation fixing and equipment anchoring,enduring vibration and shock loads.Furthermore,in power towers and communication base stations,expansion bolts ensure structural stability on various foundations.Successful application depends on selecting the correct specification based on the base material,such as concrete strength;for instance,an M10 bolt can carry up to 10 kN tensile load in C25-grade concrete.Proper installation requires careful attention to drill hole diameter and depth for optimal performance.
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