316 Stainless Steel Sleeve Expansion Anchor Bolts — Reliable Fastening in Concrete & Masonry
When a standard screw just won't hold — whether you're mounting a handrail into a concrete porch, securing equipment to a block wall, or anchoring structural brackets in a coastal environment — you need a fastener that expands to grip and won't rust out over time. These 316 stainless steel hex nut sleeve expansion anchor bolts are built for exactly those demanding situations, giving contractors, maintenance crews, and serious DIYers a dependable anchor they can trust in wet, outdoor, and corrosive conditions.
Each piece is a complete sleeve expansion anchor bolt machined from Grade 316 stainless steel, featuring a hex nut drive head and an expansion sleeve that locks into the base material when tightened. Available in thread diameters M6, M8, M10, and M12, with lengths ranging from 50mm (≈2") to 150mm (≈5.9"), and sold in sets of 1, 3, 5, or 10 pieces so you can order exactly what your project requires.
Typical applications include anchoring fence posts and gate hardware to concrete footings, securing machinery bases and equipment frames to warehouse floors, mounting handrails and balustrades to stone or brick, and fastening marine dock hardware where saltwater exposure makes 316 SS the only practical choice for long-term stainless steel anchor bolt installations.
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Compatibility: Designed for solid concrete, solid brick, natural stone, and dense masonry. Uses standard metric coarse threads — M6, M8, M10, M12. Not suitable for hollow block, drywall, or aerated concrete.
✅ Key Features of These 316 Stainless Steel Sleeve Expansion Anchor Bolts
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🛡️Grade 316 Corrosion Resistance — Contains molybdenum for superior chloride resistance versus 304 SS, making these anchors well-suited for marine, coastal, and outdoor wet environments where long-term durability matters.
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⚙️Mechanical Expansion Grip — The sleeve expands radially as the hex nut is tightened, creating a positive mechanical lock against the base material — no adhesive or chemical setting required.
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📐Wide Size Range — Available in M6 through M12 diameters and 50mm to 150mm lengths, covering the most common concrete anchor bolt sizes needed for residential and light commercial fastening tasks.
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🔧Hex Nut Drive Head — Standard hex nut configuration works with any wrench or socket set, allowing controlled torque application and easy installation with common tools already in your kit.
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📦Flexible Pack Quantities — Order 1, 3, 5, or 10 pieces per variant to match your exact project needs, reducing waste and letting you stock up for larger masonry fastening jobs without over-ordering.
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🏗️Solid-Material Anchor Design — The expansion mechanism is engineered specifically for dense base materials, providing consistent holding performance in concrete slab anchoring, block wall mounting, and stone substrate applications.
📐 Technical Specifications — Sleeve Expansion Anchor Bolts
| Material |
Grade 316 Stainless Steel |
| Thread Standard |
Metric Coarse (M6, M8, M10, M12) |
| Available Diameters |
M6 (6mm / ≈1/4"), M8 (8mm / ≈5/16"), M10 (10mm / ≈3/8"), M12 (12mm / ≈1/2") |
| Available Lengths |
50mm (≈2"), 60mm (≈2.4"), 70mm (≈2.8"), 80mm (≈3.1"), 100mm (≈3.9"), 120mm (≈4.7"), 150mm (≈5.9") |
| Drive Type |
Hex Nut |
| Anchor Type |
Sleeve Expansion Anchor |
| Suitable Base Materials |
Solid concrete, solid brick, natural stone, dense masonry |
| Finish |
Natural stainless (no coating) |
| Pack Quantities |
1, 3, 5, or 10 pieces (select variant) |
| Minimum Drill Hole Diameter |
See variant options |
| Minimum Embedment Depth |
See variant options |
| Tensile / Shear Rating |
Contact us to confirm for your specific application |
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Installation Note: Always drill to the correct diameter and depth for your chosen bolt size. Under-drilling will prevent full expansion; over-drilling reduces holding strength. Use a hammer drill with a carbide-tipped masonry bit.
❓ Frequently Asked Questions
How do I choose the right size and length for my project?
Match the bolt diameter to your fixture hole — for example, an M8 anchor requires an 8mm clearance hole in your fixture. For length, add the fixture thickness to the required embedment depth. Embedment is typically 40–60mm for M6–M8 and 50–80mm for M10–M12 in solid concrete. Quick reference: 50mm ≈ 2", 80mm ≈ 3.1", 100mm ≈ 3.9", 150mm ≈ 5.9".
What load can these expansion anchor bolts handle?
Load capacity depends on bolt diameter, embedment depth, concrete strength, and edge/spacing distances. Generally, M6 anchors handle lighter loads while M12 anchors support significantly higher forces. For safety-critical or structural applications, always consult a licensed engineer and refer to published anchor load tables for your specific installation conditions.
Are these bolts suitable for outdoor or marine environments?
Yes. Grade 316 stainless steel contains molybdenum, which provides superior resistance to chloride-induced corrosion compared to standard 304 stainless. These anchors are generally well-suited for coastal, marine dock, poolside, and outdoor wet environments. For fully submerged or highly aggressive chemical environments, confirm suitability with your project engineer.
What thread standard do these use — metric or imperial?
These use standard metric coarse threads (M6, M8, M10, M12). They are not compatible with UNC or UNF imperial thread systems. Ensure all mating nuts, washers, and fixtures use matching metric threads to avoid cross-threading or improper engagement.
Can I use these in hollow block or brick walls?
No — sleeve expansion anchors are designed for solid base materials such as poured concrete, solid brick, and natural stone. The expansion sleeve must have solid material to press against in order to develop holding strength. For hollow block, cavity walls, or lightweight aerated concrete, a different anchor type (such as a toggle bolt or chemical anchor) is generally more appropriate.
How many pieces should I order?
Each variant lets you choose 1, 3, 5, or 10 pieces. For a single fixture or repair, 1–3 pieces is typically sufficient. For larger projects — such as mounting multiple posts, brackets, or equipment frames — ordering 5–10 pieces ensures you have extras on hand in case of installation errors or future replacements.
What tools do I need to install these anchor bolts?
You will need a hammer drill fitted with a carbide-tipped masonry bit matching the bolt diameter, a wrench or socket set to tighten the hex nut, and optionally a torque wrench for controlled installation. Clean the drilled hole of dust before inserting the anchor — debris in the hole can reduce holding performance.
🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.
