Stainless Steel Through Bolts – Wall Expansion Anchor Bolts M6 M8 M10 M12 M16

As a general rule, the bolt length should equal the thickness of the fixture you're mounting plus the required embedment depth into the base material. For concrete, a minimum embedment of typically 4–5× the bolt diameter is recommended. For example, if you're mounting a 10mm-thick bracket with an M8 bolt, you'd generally want at least 40–50mm of embedment, so a total length of 50–60mm (≈2.0–2.4") would be a starting point. Always consult your local building code or a structural engineer for load-critical applications.

Load capacity depends on the bolt diameter, embedment depth, base material strength, and spacing between anchors. In general, larger diameters (M12, M16) in solid concrete typically support higher tensile and shear loads than smaller sizes (M6, M8). For precise load ratings, we recommend consulting a structural engineer or referring to anchor design software, as actual capacity varies significantly by installation conditions.

Yes. Stainless steel generally offers good resistance to rust and corrosion in outdoor, humid, and mildly corrosive environments. These through bolts are a solid choice for exterior concrete walls, outdoor handrails, and exposed masonry. For highly aggressive environments (coastal salt air, chemical exposure), we recommend confirming the specific stainless steel grade with us before ordering.

These bolts use standard metric coarse threads (M6, M8, M10, M12, M16), which are compatible with standard metric hex nuts, flat washers, and lock washers widely available in the US and internationally. They are not compatible with UNC/UNF (imperial) threaded hardware.

The required hole diameter typically matches the outer diameter of the expansion sleeve, which is generally equal to or slightly larger than the bolt's nominal diameter. For example, an M8 through bolt typically requires an 8mm masonry drill bit. We recommend confirming the exact sleeve diameter for your chosen size before drilling, as dimensions can vary slightly by design. Always use a hammer drill with a carbide-tipped masonry bit for concrete and brick.

Through-bolt expansion anchors are generally designed for solid base materials such as normal-weight concrete, solid brick, and dense block. In hollow block, lightweight concrete, or aerated concrete (AAC), the expansion mechanism may not develop full holding strength. For hollow or low-density substrates, a different anchor type (such as a sleeve anchor or chemical anchor) is typically recommended. Contact us if you're unsure about your specific base material.

Diameter selection is primarily driven by the load you need to carry and the fixture hole size. M6 and M8 are commonly used for light-duty fixtures, handrail brackets, and signage. M10 and M12 are popular for medium-duty structural connections, machinery bases, and heavy shelving. M16 is typically reserved for heavy structural anchoring. Match the bolt diameter to the pre-drilled holes in your fixture, and verify the load requirements with an engineer for critical applications.