Stainless Steel Expansion Anchor Bolts — Reliable Fastening for Concrete & Masonry
When a standard screw just won't hold — whether you're mounting a structural bracket to a concrete wall, securing equipment to a masonry floor, or anchoring a railing post to a poured slab — you need a fastener engineered for the job. Contractors, facility managers, and serious DIYers who work with concrete, brick, and stone know that the wrong anchor means callbacks, failures, and safety risks. These stainless steel expansion anchor bolts are built to deliver a secure, lasting hold in hard base materials.
Each set includes 1, 2, 3, 4, or 6 pieces (select your quantity above) of expansion anchor bolts available in thread diameters from M8 (≈5/16") to M20 (≈3/4"), with lengths ranging from 60mm (≈2.4") to 260mm (≈10.2"). Two material grades are offered — 201 stainless steel for cost-effective general use, and 304 stainless steel for enhanced corrosion resistance. Both A Type (standard sleeve anchor) and B Type (extended/hook configuration) head styles are available across the size range.
Typical applications include anchoring structural steel to concrete foundations, securing pipe hangers and conduit supports to masonry walls, mounting HVAC equipment brackets to concrete ceilings, and fastening deck ledger boards or pergola posts to block or poured concrete. These expansion anchor bolts for concrete are a go-to choice wherever a removable, high-strength mechanical anchor is needed.
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Compatibility: Designed for use in solid concrete, solid brick, natural stone, and dense masonry. Use standard metric drill bits matching the bolt diameter. Not recommended for hollow block, drywall, or wood without appropriate backing.
✅ Key Features of These Stainless Steel Expansion Anchor Bolts
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🔩Mechanical Expansion Grip — The sleeve expands radially as the nut is tightened, creating a friction-lock hold against the hole wall for a secure, vibration-resistant connection in concrete and masonry.
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🛡️Dual Stainless Steel Grades — Choose 201 SS for economical indoor and sheltered outdoor use, or 304 SS for applications exposed to moisture, humidity, or mild corrosive environments where long-term rust resistance matters.
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📐Wide Size Range (M8–M20) — Covers the most common anchor bolt sizes for light-duty brackets up to heavy structural connections, with lengths from 60mm to 260mm to match varying embedment depth requirements.
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🔄A Type & B Type Configurations — A Type suits standard through-bolt and surface-mount applications; B Type's extended shank is suited for pipe supports, hanging fixtures, and applications needing a protruding anchor point.
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📦Flexible Pack Quantities — Available in 1, 2, 3, 4, or 6-piece sets so you can order exactly what your project requires — whether it's a single anchor repair or a multi-point installation.
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⚙️Standard Metric Thread (ISO/DIN) — M8 through M20 metric coarse threads are compatible with standard metric nuts, washers, and fixtures, making these expansion anchor bolts easy to integrate into any metric fastener system.
📐 Technical Specifications — Stainless Steel Expansion Anchor Bolts
| Product Type |
Sleeve Expansion Anchor Bolt |
| Thread Diameter |
M8, M10, M12, M16, M20 |
| Length Range |
60mm (≈2.4") – 260mm (≈10.2") |
| Head / Configuration Type |
A Type (standard sleeve) / B Type (extended/hook) |
| Material — Grade 1 |
201 Stainless Steel |
| Material — Grade 2 |
304 Stainless Steel |
| Thread Standard |
Metric Coarse (ISO/DIN) |
| Suitable Base Materials |
Solid concrete, solid brick, natural stone, dense masonry |
| Pack Quantity Options |
1 Pc / 2 Pcs / 3 Pcs / 4 Pcs / 6 Pcs |
| Finish |
Brushed stainless (natural mill finish) |
| Recommended Drill Bit |
Matching diameter carbide-tipped masonry bit (e.g., 10mm bit for M10) |
| Installation Torque |
See variant options — varies by diameter |
| Minimum Embedment Depth |
See variant options — typically 4–6× bolt diameter |
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Note: Load ratings vary by bolt diameter, embedment depth, and base material strength. For structural or safety-critical applications, consult a licensed engineer and verify pull-out strength on-site before applying full load.
❓ Frequently Asked Questions
How do I choose the right bolt length for my application?
A general rule: bolt length = material thickness being fastened + minimum embedment depth into the base material. For concrete, embedment is typically 4–6× the bolt diameter. For example, an M10 bolt anchoring a 10mm bracket into concrete generally needs at least 40–60mm of embedment, so a 100mm (≈3.9") bolt is a common starting point. Always consult the structural load requirements for your specific project.
What is the load capacity of these expansion anchor bolts?
Load capacity depends on bolt diameter, embedment depth, and base material strength. Generally, M8 anchors in standard concrete (C20) carry roughly 3–5 kN in tension; M12 anchors typically handle 6–10 kN. These are indicative ranges — actual capacity varies with installation quality and concrete grade. Always verify with a structural engineer for safety-critical applications.
Are these bolts suitable for outdoor or marine environments?
304 stainless steel offers good corrosion resistance for most outdoor and mildly humid environments. For coastal areas with regular salt spray, 304 SS generally performs well for moderate exposure. 201 SS is better suited for dry or lightly exposed indoor/outdoor use. Neither grade is recommended for continuous saltwater immersion — for that, 316 SS would typically be specified.
What thread standard do these expansion bolts use, and are they compatible with standard hardware?
These bolts use standard metric coarse threads (ISO metric). M8, M10, M12, M16, and M20 designations follow DIN/ISO standards, making them compatible with standard metric nuts, washers, and fixtures widely available in the US and internationally. No special tools or proprietary hardware are required.
What is the difference between A Type and B Type anchor bolts?
A Type is a standard sleeve expansion anchor with a flat or hex head, designed for through-bolt or surface-mount applications where the fixture sits flush against the base material. B Type features an extended shank or hook configuration, suited for hanging fixtures, pipe supports, or applications requiring a protruding anchor point above the surface. Check the variant images to confirm the head style for your use case.
Can I use these anchors in brick or block walls?
Yes, expansion anchor bolts can generally be used in solid brick, concrete block, and stone. However, load ratings in hollow block or soft brick are significantly lower than in solid concrete. For hollow masonry, a sleeve anchor or hollow-wall anchor is typically more appropriate. Always test pull-out strength before applying full load in any masonry application.
How do I install these expansion anchor bolts correctly?
Drill a hole matching the bolt diameter (e.g., a 10mm carbide masonry bit for M10) to the required depth. Clear dust and debris from the hole using compressed air or a brush. Insert the anchor bolt and hand-tighten the nut. Then torque the nut to specification — the sleeve expands against the hole wall as the nut is tightened, creating the mechanical lock. Recommended torque is typically 20–50 Nm for M10–M12; consult torque specs for your specific diameter.
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