Stainless Steel Expansion Anchor Bolts for Concrete & Masonry — M6 to M16, Extra Long

A general rule of thumb: the embedment depth should be at least 10× the bolt diameter. For example, an M8 bolt typically requires at least 80mm (≈3.1") of embedment into concrete. Add the thickness of the fixture being fastened to determine the total bolt length you need. When in doubt, size up — a longer anchor in a deeper hole is always safer than a short one near the surface.

Load capacity depends on bolt diameter, embedment depth, and the compressive strength of the base material. Generally, M6 anchors in standard concrete (C20/25) carry tensile loads in the range of 1–2 kN, while M12 and larger anchors can handle significantly higher loads. For safety-critical or structural installations, always consult a licensed structural engineer and refer to the relevant building code.

Yes — select the A4 Stainless Steel grade for outdoor, marine, or high-humidity applications. A4 (316 equivalent) contains molybdenum, which provides superior resistance to chloride-induced corrosion and salt spray. The 201 Stainless Steel grade is well-suited for dry or sheltered indoor environments but is generally not recommended for direct salt-air exposure.

These bolts use standard ISO metric coarse threads (M6, M8, M10, M12, M14, M16). They are fully compatible with standard metric nuts and flat washers of the corresponding size, which are widely available at any hardware store.

These expansion anchor bolts are designed for solid concrete, brick, block, and natural stone masonry. They are generally not recommended for hollow-core block, aerated concrete (AAC/Hebel), or very soft stone without engineering review, as the expansion mechanism requires a solid substrate to develop full holding strength.

1. Drill a hole matching the bolt diameter to the required depth using a hammer drill and a carbide-tipped masonry bit.
2. Clear all dust and debris from the hole (blow out or vacuum).
3. Insert the anchor bolt into the hole.
4. Place your fixture over the bolt, then thread on the nut.
5. Tighten the nut with a wrench — this pulls the bolt upward and expands the sleeve against the hole wall, creating a secure mechanical lock.

201 Stainless Steel is a cost-effective austenitic grade with good general corrosion resistance, suitable for dry or mildly humid indoor environments. A4 Stainless Steel (equivalent to 316) contains molybdenum, which significantly improves resistance to chloride attack, salt spray, and industrial chemicals — making it the right choice for outdoor concrete anchor bolt applications in coastal or chemically aggressive settings.