M6-M20 Stainless Steel Concrete Expansion Anchor Bolts – Extra Long

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M6-M20 Stainless Steel Concrete Expansion Anchor Bolts – Extra Long

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Size(mm): M6x50 extra long

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Concrete Expansion Anchor Bolts That Hold When Standard Lengths Fall Short

When you're anchoring through thick cladding, insulation board, or a deep fixture flange into concrete or masonry, a standard-length bolt simply doesn't leave enough embedment depth to develop full holding strength — and that's a safety problem. These extra-long A2 stainless steel concrete expansion anchor bolts are built for contractors, structural installers, and serious DIYers who need reliable anchoring in demanding applications where off-the-shelf lengths won't cut it.

Each bolt is a sleeve-style expansion anchor machined from A2 (304) stainless steel. Available in thread diameters M6 through M20 and lengths from 50mm (≈2.0") up to 400mm (≈15.7"), with quantity options of 1, 2, or 5 pieces per order. The metric coarse thread profile is compatible with standard ISO nuts and washers. The expansion sleeve engages the bore wall as the bolt is tightened, creating a mechanical lock in the base material.

Typical use cases include anchoring structural steel brackets to concrete columns, securing facade support rails through thick insulation, fixing heavy machinery base plates to reinforced concrete floors, and attaching timber ledger boards to masonry walls — all scenarios where a long concrete anchor bolt with corrosion resistance is non-negotiable.

🔩 Compatible with: Solid concrete (C20/25+), dense brick, natural stone, and hard masonry. Threads conform to ISO metric coarse standard — fits standard M6–M20 nuts and washers.

⚠️ Confirm before ordering: Verify the required embedment depth for your specific load and base material. Not suitable for hollow block, AAC, or soft brick without specialist anchoring systems.

✅ Key Features of These Concrete Expansion Anchor Bolts

🦾Extra-Long Reach — Lengths from 50mm to 400mm (≈2.0"–15.7") let you achieve full embedment depth even when anchoring through thick fixtures, insulation, or cladding panels where standard concrete anchor bolts fall short.
🌊A2 Stainless Steel Construction — Grade 304 stainless resists rust and oxidation in outdoor, humid, and mildly corrosive environments, making these suitable for exterior structural anchoring without the coating degradation common on zinc-plated alternatives.
📐Wide Diameter Range M6–M20 — A single product line covers light-duty M6 anchors up to heavy-duty M20 bolts, so you can match the anchor to the actual load requirement rather than compromising on size.
🔧Sleeve Expansion Mechanism — The mechanical expansion sleeve locks against the bore wall as torque is applied, distributing load across the concrete rather than relying on adhesive or chemical bonding — no mixing, no cure time.
⚙️ISO Metric Coarse Thread — Standard pitch threads (M6×1.0 through M20×2.5) are compatible with off-the-shelf nuts, washers, and threaded fittings, simplifying assembly on site without special tooling.
📦Flexible Pack Quantities — Order 1, 2, or 5 pieces per size so you can buy exactly what a job requires — useful for one-off repairs or multi-anchor structural installations alike.

📐 Technical Specifications — Concrete Expansion Anchor Bolts

Product Type	Sleeve Expansion Anchor Bolt
Material	A2 Stainless Steel (Grade 304)
Thread Standard	ISO Metric Coarse (DIN 976 / DIN 931 compatible)
Available Diameters	M6, M8, M10, M12, M14, M16, M18, M20
Available Lengths	50mm (≈2.0") – 400mm (≈15.7"); see variant options
Thread Pitch	M6: 1.0mm · M8: 1.25mm · M10: 1.5mm · M12: 1.75mm · M14–M16: 2.0mm · M18–M20: 2.5mm
Drill Hole Diameter	Matches nominal bolt diameter (e.g., M10 → 10mm hole)
Base Material	Solid concrete (C20/25+), dense masonry, natural stone
Finish	Brushed / natural stainless
Pack Quantity	1 pcs / 2 pcs / 5 pcs — see variant options
Minimum Embedment Depth	Typically 5–6× bolt diameter; contact us to confirm for your load case
Tensile Strength Class	See variant options / Contact us to confirm

❓ Frequently Asked Questions

How do I choose the right length for a concrete expansion anchor bolt?

The required length is generally the fixture thickness plus the minimum embedment depth. For M6 anchors, minimum embedment is typically 30–40mm; for M12, typically 60–80mm. As a rule of thumb, select a bolt long enough so at least 5–6 thread diameters remain embedded in the base material after the fixture is clamped. For example, a 10mm-thick bracket on concrete with an M8 anchor typically needs at least 80mm (≈3.1") total length.

What tensile and shear loads can these expansion anchor bolts handle?

Load capacity depends on bolt diameter, embedment depth, and base material strength. Generally, M6 anchors in C20/25 concrete carry approximately 3–5 kN in tension; M12 anchors typically carry 10–18 kN. Always consult a structural engineer and refer to the manufacturer's load tables for safety-critical applications.

Are these bolts suitable for outdoor or wet environments?

Yes. These are A2 (304) stainless steel, which provides good corrosion resistance in most outdoor and mildly corrosive environments. For coastal or highly chloride-rich environments, A4 (316) stainless is generally recommended instead.

What thread standard do these expansion bolts use?

These bolts use standard ISO metric coarse threads (DIN 976 / DIN 931 compatible). M6 pitch is typically 1.0mm, M8 is 1.25mm, M10 is 1.5mm, M12 is 1.75mm, M14 is 2.0mm, M16 is 2.0mm, M18 is 2.5mm, and M20 is 2.5mm. This means they accept any standard metric nut or washer of the matching size.

Can I use these anchors in brick or block, not just concrete?

These expansion anchors are designed primarily for solid concrete and dense masonry. Use in hollow block, aerated concrete (AAC), or soft brick is generally not recommended, as the expansion mechanism requires a solid base material to develop full holding strength. For hollow substrates, a chemical anchor or toggle bolt system is typically more appropriate.

Why choose an extra-long expansion bolt over a standard-length one?

Extra-long bolts are needed when anchoring through thick fixtures, insulation layers, cladding panels, or when the base material surface is recessed. They allow adequate embedment depth even when significant material thickness sits between the bolt head and the concrete surface — a situation where standard-length concrete anchor bolts would leave insufficient grip in the base material.

What drill bit size should I use for each bolt diameter?

The drill hole diameter matches the bolt's nominal diameter: M6 → 6mm bit, M8 → 8mm bit, M10 → 10mm bit, M12 → 12mm bit, M14 → 14mm bit, M16 → 16mm bit, M18 → 18mm bit, M20 → 20mm bit. Always use a carbide-tipped SDS or hammer drill bit rated for concrete, and clean the hole of dust before inserting the anchor.

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M6-M20 Stainless Steel Concrete Expansion Anchor Bolts – Extra Long

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Concrete Expansion Anchor Bolts That Hold When Standard Lengths Fall Short

✅ Key Features of These Concrete Expansion Anchor Bolts

📐 Technical Specifications — Concrete Expansion Anchor Bolts

❓ Frequently Asked Questions

M6-M20 Stainless Steel Concrete Expansion Anchor Bolts – Extra Long

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