Carbon Steel Expansion Anchor Bolts — M6 to M24, 45mm to 250mm

Generally, the bolt length should equal the fixture thickness plus the minimum embedment depth required by the base material. For concrete anchoring, a typical rule of thumb is embedment depth of at least 4× the bolt diameter. For example, an M10 bolt typically requires at least 40mm of embedment, so if your fixture is 20mm thick, choose a bolt of at least 60mm (≈2-3/8"). Always verify with the manufacturer's installation guide or a structural engineer for load-critical connections.

Load capacity depends on bolt diameter, embedment depth, and base material strength. In general, larger diameters (M16–M24) in solid concrete typically support significantly higher shear and tensile loads than smaller sizes (M6–M8). For precise load ratings, consult a structural engineer or refer to the relevant anchor design standard (e.g., ACI 318 Appendix D / ETAG 001) for your application.

These bolts are carbon steel. For outdoor or high-humidity environments, applying a corrosion-resistant coating (e.g., zinc plating or paint) after installation is generally recommended to extend service life. For permanently wet, coastal, or marine environments, stainless steel anchors are typically a better long-term choice.

These bolts follow the metric coarse thread standard (ISO 68-1), which is the most common thread form for M-series fasteners. They are compatible with standard metric nuts and flat washers of the corresponding size, available at any hardware store.

Expansion anchor bolts of this type are generally designed for use in solid concrete, brick, and masonry block. They are not recommended for hollow block, drywall, wood, or soft materials where the expansion sleeve cannot engage the hole wall properly. When in doubt, test a single anchor before committing to a full installation.

Smaller diameters (M6–M8) are typically used for light-duty fixtures such as shelving brackets, electrical conduit hangers, and signage. Medium sizes (M10–M12) suit structural brackets, handrails, and HVAC equipment mounts. Larger diameters (M14–M24) are generally reserved for heavy structural connections, machinery anchoring, and civil engineering applications. When in doubt, size up — a larger anchor in a properly drilled hole is always safer than an undersized one.

Yes. You will typically need a carbide-tipped masonry or hammer drill bit matching the bolt's nominal diameter (e.g., a 10mm bit for M10 bolts). The hole depth should meet or exceed the bolt's required embedment depth. Always blow out dust and debris from the hole before inserting the anchor to ensure proper expansion and holding strength.