316 Stainless Steel Through Bolts – Wall Expansion Anchor Bolts M6–M16

Match the bolt diameter to your fixture's clearance hole — for example, an M8 bolt fits an 8mm hole in your bracket. For length, add the fixture thickness to the minimum embedment depth into the base material (typically 4–5× the bolt diameter). As a practical example, M8×80mm (≈5/16" × 3-1/8") generally works well for fixtures up to about 20mm (≈3/4") thick in standard concrete. When in doubt, choose one step longer for a more secure hold.

Load capacity depends on bolt diameter, embedment depth, and the compressive strength of the base material. Generally, larger diameters and deeper embedment yield higher tensile and shear ratings. For structural or safety-critical installations — such as handrail posts or overhead fixtures — always consult a licensed engineer and reference the specific load data for your conditions rather than relying on general estimates.

Yes. 316 stainless steel contains molybdenum, which significantly improves resistance to chloride-induced pitting and crevice corrosion compared to standard 304 stainless. These through bolts are generally well suited for coastal, poolside, marine dock, and other outdoor concrete anchor applications where long-term corrosion resistance is a priority.

These bolts use standard ISO metric coarse threads (M6, M8, M10, M12, M16), compatible with any standard metric nut or washer of the matching size. They are not compatible with UNC or UNF inch-standard fasteners. If your project uses inch hardware, please verify sizing before ordering.

These through bolts are designed for solid concrete, brick, and dense masonry. They are generally not recommended for hollow concrete block, aerated autoclaved concrete (AAC / Hebel), soft brick, or any substrate that cannot provide consistent resistance around the drilled hole. In those materials, a chemical anchor system is typically a better choice.

1. Drill a hole matching the bolt diameter to the required depth using a hammer drill and carbide-tipped bit.
2. Clean the hole thoroughly with a brush and compressed air to remove all dust.
3. Pass the bolt through your fixture and into the hole.
4. Tighten the nut with a wrench — the expansion sleeve spreads outward and grips the hole wall as torque is applied.
5. Do not over-tighten; follow the torque specification for the bolt size to avoid cracking the base material.

In most cases, no. Once the expansion sleeve has been set, the mechanical deformation is permanent. Reinstalling the same bolt in the same hole typically results in reduced holding strength. For any application where load integrity matters, always install new anchors rather than reusing removed ones.

As a general guideline, M10 through bolts are commonly used for medium-duty brackets, conduit supports, and equipment mounts in residential and light commercial settings. M12 is typically chosen when the fixture is heavier, the span between anchor points is larger, or the application involves dynamic loads (vibration, wind). If you're unsure, M12 provides a meaningful safety margin over M10 with only a modest increase in hole size and cost.