Closed Hook Eye Bolt Shield Anchor — M6 M8 M10 M12 Expansion Bolt for Concrete & Masonry

Match the thread diameter to your load requirements: M6 (≈1/4" equiv.) for lighter fixtures, M8 for medium loads, M10–M12 for heavier structural hanging. For length, the bolt shank should penetrate at least 25–30mm into solid concrete beyond any surface material. For example, if hanging through a 20mm bracket, choose at least a 50mm bolt. Available lengths range from 50mm (≈2") to 150mm (≈5.9"). When in doubt, size up.

Load capacity depends on thread size, embedment depth, and base material strength. Generally, M6 anchors in solid concrete are suitable for moderate static loads such as hanging lights or small cable trays, while M10–M12 anchors can handle heavier suspended loads. Always apply a safety factor (typically 4:1 or greater for overhead applications) and consult a structural engineer for critical load-bearing installations.

These anchors are generally suitable for sheltered outdoor use. The zinc-plated finish provides baseline corrosion resistance for typical 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 submerged or continuously wet installations with standard zinc-plated versions.

These bolts use standard metric coarse threads (M6, M8, M10, M12) per ISO standards. They are compatible with standard metric nuts, shackles, turnbuckles, and fittings. They are not designed for UNC or UNF inch-thread systems — do not mix thread standards.

These closed hook eye bolt shield anchors are designed for solid concrete, brick, and dense masonry block. The expansion sleeve requires a solid, non-crumbling substrate to grip effectively. They are generally not recommended for hollow block, aerated concrete (AAC), drywall, wood, or soft materials where the sleeve cannot expand against a firm wall.

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 (sleeve length + 5mm clearance), blow out dust, and insert the anchor before tightening.

For dynamic loads such as hammocks, swings, or rope courses, use M10 or M12 anchors installed into solid reinforced concrete. Dynamic and shock loads are significantly higher than equivalent static loads — typically 2–4× or more. Always apply a generous safety factor, use the longest available bolt for maximum embedment, and have the installation inspected by a qualified person before use.