Stainless Steel Expansion Anchor Bolts for Concrete & Masonry — M6 to M20

A general rule of thumb: the embedded length should be at least 10× the bolt diameter. For example, an M8 bolt typically needs at least 80mm (≈3.1") of embedment in the base material. Add the thickness of your fixture (bracket, plate, etc.) to that embedment depth to get the total bolt length you need. For heavy-duty overhead or structural anchoring, always consult a structural engineer and reference the manufacturer's load table.

Load capacity depends on several factors: bolt diameter, embedment depth, concrete compressive strength, edge distance, and bolt spacing. Generally, larger diameters and deeper embedment yield higher pull-out and shear resistance. For critical structural applications — such as overhead lifting points or seismic zones — always verify with a certified load table or a licensed structural engineer. Contact us to confirm specifications for your project.

304 stainless steel is suitable for most outdoor and mildly corrosive environments, including garden structures, decks, and exterior walls. 316 stainless steel is recommended for coastal, marine, pool-area, or chemically aggressive settings due to its superior chloride and salt-spray resistance. 201 stainless steel is best suited for dry or lightly humid indoor applications. When in doubt, choose 316 for any installation within a few miles of saltwater.

These bolts use standard ISO metric coarse threads (M6, M8, M10, M12, M14, M16, M18, M20). They are fully compatible with standard metric hex nuts, flat washers, and lock washers of the same diameter designation. No adapters are needed when integrating into existing metric fastener systems.

These expansion anchor bolts are designed for use in solid concrete, brick, natural stone, and dense masonry block. They are generally not recommended for hollow-core block, aerated autoclaved concrete (AAC / Hebel), soft brick, or any substrate with voids behind the face — in those cases, a chemical anchor or toggle-style anchor is typically more appropriate. If you are unsure about your substrate, contact us to confirm compatibility.

Here's a quick decision guide: 201 — budget-friendly, suitable for dry indoor projects with minimal moisture exposure. 304 — the most common choice for general outdoor use, garden structures, moderate humidity, and most residential applications. 316 — choose this for coastal or marine environments, pool surrounds, chemical plants, or any setting with prolonged exposure to salt, chlorine, or industrial chemicals. 316 contains molybdenum, which significantly improves pitting and crevice corrosion resistance.

Yes. Use a carbide-tipped masonry or SDS drill bit sized to match the bolt's outer sleeve diameter (not the thread diameter). The hole depth should typically equal the bolt's embedded length plus a small clearance at the bottom for dust. Always use a hammer drill or rotary hammer — a standard drill will not penetrate concrete effectively. After drilling, clear the hole of dust with a blow-out bulb or compressed air before inserting the bolt.