304 Stainless Steel Lifting Eye Ring Concrete Sleeve Anchor Bolts — M8 to M20

Generally, the anchor embedment depth should be at least 1.5× the bolt diameter. For example, an M10 anchor typically needs at least 15mm of embedment into concrete. Add the thickness of the material being fastened to determine the total bolt length you need. As a practical rule: bolt length = material thickness + minimum embedment depth. For example, if you're fastening a 20mm bracket with an M10 anchor, you'd typically want at least a 60mm (≈2.4") bolt. When in doubt, go longer — you can always use a nut to adjust the exposed thread.

Load capacity depends on the bolt diameter, embedment depth, and the compressive strength of the concrete. Larger diameters (M16, M20) generally support significantly higher loads than smaller ones (M8, M10). In typical 3,000 psi concrete with full embedment, M8 anchors can generally handle several hundred pounds of pull-out force, while M20 anchors can handle several thousand pounds — but these are general estimates. Always consult a structural engineer for safety-critical or overhead lifting applications and never exceed the rated working load limit for the specific installation conditions.

Yes. These anchors are made from 304 stainless steel, which provides strong resistance to rust and oxidation in most outdoor, humid, and mildly corrosive environments — making them a far better long-term choice than zinc-plated or galvanized anchors for exterior concrete applications. For highly corrosive environments such as coastal, marine, or chemical-exposure settings, 316 stainless steel is generally recommended for even greater corrosion resistance.

These anchors use standard ISO metric coarse threads, which are the most common metric thread standard used worldwide. M8, M10, M12, M14, M16, and M20 sizes are all compatible with standard metric nuts, washers, shackles, hooks, and lifting rings available at any hardware or rigging supply store. No special or proprietary hardware is required.

Sleeve expansion anchors are primarily designed for solid poured concrete, where they perform best. They can generally be used in solid brick or dense concrete block, but performance in hollow block, lightweight block, or soft masonry is typically reduced and may not be reliable. Always verify the base material's density and suitability before installation, and consider using a different anchor type (such as a chemical anchor) for hollow or soft masonry.

Installation is straightforward: (1) Drill a hole in the concrete matching the anchor diameter to the required depth using a hammer drill and carbide-tipped bit. (2) Clear all dust and debris from the hole using compressed air or a brush. (3) Insert the anchor into the hole — the sleeve should sit flush with or slightly below the surface. (4) Place a washer and nut on the threaded shank and tighten with a wrench. As the nut is tightened, the sleeve expands against the bore wall, locking the anchor in place. Do not over-torque, as this can crack the surrounding concrete or damage the anchor.

Single pieces are ideal when you need just one anchor for a specific repair or a one-off installation. Multi-packs (2, 3, 4, 5, 7, or 10 pcs) offer a lower per-unit cost and are practical for projects requiring multiple anchor points — such as hanging equipment, installing safety railings, setting up rigging points in a workshop, or securing machinery to a concrete floor. Buying a multi-pack also ensures you have spares on hand if a hole needs to be re-drilled or an anchor is damaged during installation.