Hex Head Expansion Anchor Bolts — M6 to M20, Stainless Steel A2 & Zinc Plated, Extra Long

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Hex Head Expansion Anchor Bolts — M6 to M20, Stainless Steel A2 & Zinc Plated, Extra Long

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Sizes: M6 x 40mm - Stainless Steel A2

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Hex Head Expansion Anchor Bolts — Reliable Fixing into Concrete, Brick & Masonry

When a standard screw just won't hold — whether you're mounting a structural bracket to a concrete wall, securing a gate post into brick, or anchoring heavy equipment to a slab — you need a hex head expansion anchor bolt that expands under load and locks itself in place. These bolts are designed for contractors, tradespeople, and serious DIYers who need a dependable, code-compatible fixing in hard base materials.

Each bolt is a single-piece hex head expansion anchor. Available in M6, M8, M10, M12, M16, and M20 thread diameters, with lengths ranging from 40mm (≈1-9/16") to 250mm (≈9-13/16"). Two finish options are offered: Stainless Steel A2 (304) for corrosion resistance, and Zinc Plated for cost-effective indoor use. Order in packs of 1, 2, 5, or 10 to match your project quantity.

Typical applications include anchoring structural steel to concrete foundations, fixing timber ledger boards to masonry walls, securing HVAC brackets and cable trays to concrete ceilings, and mounting handrails or balustrades to brick piers — all scenarios where a hex head expansion anchor bolt for concrete provides the pull-out resistance that standard fasteners cannot.

🔩 Compatibility: Fits standard ISO metric nuts and washers (M6–M20). Requires a hammer drill with a carbide-tipped masonry bit matching the bolt's nominal diameter. Suitable for solid concrete, dense brick, and solid block. Not recommended for hollow block or aerated concrete (AAC) without specialist anchors.

✅ Key Features of These Hex Head Expansion Anchor Bolts

⚙️Mechanical Expansion Grip — The sleeve expands against the bore wall as the bolt is tightened, creating a friction-based lock that resists pull-out forces in concrete and masonry anchoring applications.
🦺A2 Stainless Steel Option — The 304-grade stainless variants offer strong resistance to rust and oxidation, making them a practical choice for exterior masonry bolts, damp environments, and outdoor structural fixings.
📏Wide Size Range — Thread diameters from M6 to M20 and lengths from 40mm to 250mm cover light-duty bracket fixings through to heavy structural concrete anchor bolt applications in a single product line.
🔧Hex Head Drive — Standard hex head accepts any metric spanner or socket set, allowing controlled torque application without specialist tools — important for achieving correct expansion without over-tightening.
💰Flexible Pack Quantities — Available in packs of 1, 2, 5, or 10 so you can order exactly what your job requires, whether it's a single repair fix or a multi-point structural installation.
🏗️Zinc Plated Option for Indoor Use — The zinc plated variants provide a cost-effective solution for interior concrete anchor bolt applications such as equipment mounting, shelving supports, and partition wall fixings in dry conditions.

📐 Technical Specifications — Hex Head Expansion Anchor Bolts

Product Type	Hex Head Expansion Anchor Bolt (Sleeve Anchor)
Thread Standard	ISO Metric Coarse (DIN 931/933 compatible)
Thread Diameters Available	M6, M8, M10, M12, M16, M20
Lengths Available	40mm (≈1-9/16") – 250mm (≈9-13/16")
Finish Options	Stainless Steel A2 (304) / Zinc Plated
Head Style	Hex Head
Drive Type	Spanner / Socket (Hex)
Base Material Suitability	Solid concrete, dense brick, solid block
Recommended Drill Bit	Carbide-tipped masonry bit, diameter = bolt nominal size
Pack Quantities	1 pc / 2 pcs / 5 pcs / 10 pcs (see variant options)
Tensile Strength (A2 grade)	See variant options / Contact us to confirm for specific sizes
Country of Origin	Contact us to confirm

⚠️ Note: Always verify the minimum embedment depth and torque specification for your chosen diameter before installation. For structural or safety-critical applications, consult a qualified engineer.

❓ Frequently Asked Questions

How do I choose the right bolt length for my application?

As a general rule, the bolt should penetrate the base material (concrete, brick, or masonry) by at least 25–30mm beyond the fixture thickness. For example, if your bracket is 10mm (≈3/8") thick and you need 30mm (≈1-3/16") embedment, choose a bolt of at least 40mm (≈1-9/16"). Always check the anchor's minimum embedment depth for the specific diameter you're using.

What load can these expansion anchor bolts handle?

Load capacity depends on bolt diameter, embedment depth, and base material strength. Generally, an M8 anchor in C20 concrete can handle approximately 3–5 kN in tension and 2–4 kN in shear. For safety-critical applications, always consult a structural engineer and refer to the specific anchor's technical data sheet.

Can I use these bolts outdoors or in wet environments?

The Stainless Steel A2 (304) variants are suitable for outdoor and mildly corrosive environments — exterior cladding, garden walls, covered structures. For highly corrosive or coastal environments, A4 (316) stainless is generally recommended. The Zinc Plated variants are best suited for dry indoor applications and are typically not recommended for direct outdoor exposure.

What thread standard do these expansion bolts use, and are they compatible with standard nuts?

These bolts use standard ISO metric coarse threads (DIN 931/933 compatible), so they are compatible with standard metric nuts and washers of the corresponding size — M6, M8, M10, M12, M16, or M20. No special hardware is required.

What drill bit size do I need for each bolt diameter?

Typically, the drill hole diameter matches the bolt's nominal diameter: M6 → 6mm bit, M8 → 8mm bit, M10 → 10mm bit, M12 → 12mm bit, M16 → 16mm bit, M20 → 20mm bit. Always use a hammer drill with a carbide-tipped masonry bit for concrete and brick. Clean out the hole with a brush or air before inserting the anchor.

Which finish should I choose — Stainless Steel A2 or Zinc Plated?

Choose Stainless Steel A2 for outdoor, damp, or corrosion-prone environments — it offers significantly better rust resistance and is the right choice for exterior masonry bolts. Choose Zinc Plated for indoor, dry applications where cost is a priority. Zinc plated bolts are generally not recommended for direct outdoor exposure without additional protection.

Can these be used in brick or block as well as concrete?

Yes. Expansion anchor bolts are generally suitable for solid concrete, dense brick, and solid block. They are typically not recommended for hollow block, aerated concrete (AAC/Aircrete), or soft/crumbling masonry — those substrates require specialist anchors designed for low-density base materials.

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Hex Head Expansion Anchor Bolts — M6 to M20, Stainless Steel A2 & Zinc Plated, Extra Long

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Beschreibung

Hex Head Expansion Anchor Bolts — Reliable Fixing into Concrete, Brick & Masonry

✅ Key Features of These Hex Head Expansion Anchor Bolts

📐 Technical Specifications — Hex Head Expansion Anchor Bolts

❓ Frequently Asked Questions

Hex Head Expansion Anchor Bolts — M6 to M20, Stainless Steel A2 & Zinc Plated, Extra Long

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