M6 M8 M10 M12 Extra Long Masonry Concrete Expansion Bolt Wall Anchor Screw

A general rule is that the anchor should embed at least 4–5× the bolt diameter into solid concrete beyond any surface material. For example, an M8 bolt typically needs at least 32–40mm of embedment. If you're fastening through a bracket or base plate, add that thickness to the required embedment depth to determine your minimum bolt length. Available lengths range from 50mm (≈2") to 150mm (≈5.9") — when in doubt, choose longer for greater pull-out resistance.

Load capacity depends on bolt diameter, embedment depth, and the compressive strength of the base material. Generally, M6 anchors handle lighter structural loads such as conduit straps and light brackets, while M10 and M12 anchors are suited for heavier fixtures, machinery bases, and structural connections. Always apply an appropriate safety factor (typically 4:1 or greater for structural applications) and consult a structural engineer for critical installations.

These anchors are generally suitable for sheltered outdoor use. The zinc-plated finish provides baseline corrosion resistance for indoor and covered outdoor conditions. For prolonged exposure to rain, humidity, or coastal salt air, consider applying additional protective coating or contact us to confirm stainless steel availability. Avoid continuous submersion with standard zinc-plated versions.

These bolts use standard ISO metric coarse threads (M6, M8, M10, M12). They are not compatible with UNC or UNF inch-thread fasteners or fittings. Ensure any nuts, washers, or fixtures you pair with these anchors are rated for the corresponding metric thread size.

These expansion bolts are designed for solid, dense base materials including poured concrete, solid brick, natural stone, and dense concrete block. They are generally not recommended for hollow-core block, lightweight aerated concrete (AAC/aircrete), or drywall without engineering review, as the expansion sleeve requires solid material to grip against effectively.

The required hole diameter matches the anchor sleeve outer diameter. Typical sizing: M6 → 10mm hole | M8 → 12mm hole | M10 → 14mm hole | M12 → 16mm hole. Always use a hammer drill with a carbide-tipped masonry bit. Drill to the correct depth (anchor length + 5mm clearance), blow out dust, insert the anchor, then tighten. Contact us to confirm the exact hole size for your specific variant.

Extra long expansion bolts (100–150mm) provide greater embedment depth, which generally increases pull-out resistance and shear strength compared to shorter anchors in the same diameter. They are particularly useful when fastening through thick base plates, insulation layers, tile, or cladding before reaching the structural concrete or masonry substrate — situations where a standard 50–60mm anchor would not achieve adequate embedment.