Stainless Steel Through Anchor Bolts — M6 M8 M10 M12 M16 Expansion Bolt

The bolt length should generally equal the thickness of the fixture or material being fastened plus the minimum embedment depth in the base material. For concrete, embedment is typically 4–6× the bolt diameter — so an M8 bolt generally needs at least 32–48mm of embedment. Add your fixture thickness on top of that to get the minimum bolt length. For example, fastening a 10mm bracket with an M8 bolt into concrete: 10mm + 40mm embedment = at least 50mm bolt length. When in doubt, size up — you can always use a nut to manage exposed thread. Lengths are listed in mm; divide by 25.4 to convert to inches (e.g., 100mm ≈ 3-15/16").

Load capacity depends on bolt diameter, embedment depth, and the compressive strength of the base material. Larger diameters (M12, M16) in solid concrete generally support significantly higher loads than smaller sizes (M6, M8). For non-structural or general-purpose applications such as shelving and conduit supports, these bolts are typically adequate when correctly sized and installed. For structural, safety-critical, or overhead applications, consult a licensed engineer and verify load ratings against your specific base material.

Yes. The 304 A2 stainless steel construction provides good corrosion resistance in most outdoor, humid, and mildly coastal environments. These bolts are generally suitable for exterior walls, patios, garden structures, and wet indoor areas such as bathrooms and basements. For highly aggressive marine environments with constant salt spray or chemical exposure, 316 stainless steel is typically recommended for longer service life.

These bolts use standard ISO metric coarse threads (M6, M8, M10, M12, M16), which are compatible with any standard metric nut and washer of the matching size. They are not compatible with UNC or UNF inch-standard fasteners. Standard metric hex nuts and flat washers are widely available at any hardware store.

Through anchor expansion bolts are designed for solid base materials — primarily solid concrete, solid brick, and natural stone. The expansion sleeve requires solid material to grip against as it expands. They are generally not recommended for hollow concrete block, aerated concrete (AAC/Ytong), soft brick, or drywall without engineering review, as the expansion mechanism may not develop adequate holding strength in these materials.

Installation is straightforward: (1) Drill a hole in the base material using a masonry bit matching the bolt diameter, to the required depth. (2) Clean the hole thoroughly with a brush or compressed air to remove dust. (3) Insert the bolt through the fixture and into the hole. (4) Hand-tighten the nut, then use a wrench to tighten to the recommended torque — as the nut turns, the expansion sleeve expands against the hole wall. Do not over-torque, as excessive force can crack the surrounding base material.

For light-duty shelf brackets, picture rails, and small fixtures, M6 or M8 through anchor bolts are typically sufficient. For heavier shelving systems, TV wall mounts, or structural brackets carrying significant weight, M10 or M12 is generally recommended. For heavy equipment bases or structural connections, consider M12 or M16. Always verify that your chosen size meets the load requirements of your specific application.