304 Stainless Steel Expansion Eyebolts — Secure Overhead Anchoring in Concrete & Masonry
Whether you're rigging a rope swing, hanging a heavy chandelier, or anchoring safety cables to a concrete ceiling, a loose or corroded anchor point is a liability you can't afford. These 304 stainless steel expansion eyebolts give DIYers, contractors, and riggers a reliable, corrosion-resistant anchor that sets firmly in concrete and solid masonry with nothing more than a hammer drill and a wrench.
Each expansion eyebolt is machined from 304 stainless steel and features a closed ring head for attaching hooks, shackles, carabiners, or wire rope. Available in metric thread diameters M6, M8, M10, and M12, with shank lengths ranging from 50mm (≈2.0") to 150mm (≈5.9"), these bolts cover a wide range of embedment depths and fixture thicknesses. Order in quantities of 1, 5, 10, or 50 pieces to match your project scale.
Typical applications include overhead rigging points in workshops and garages, anchor bolts for swing sets and playground equipment, cable management anchors on concrete walls, and suspension points for industrial lighting or HVAC equipment — anywhere you need a dependable stainless steel ring anchor bolt in concrete.
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Installation note: Expansion anchors require solid concrete or dense masonry. Do not use in hollow block, AAC, or soft brick without consulting a structural engineer. Always verify embedment depth and base material strength before loading.
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Thread compatibility: Standard ISO metric coarse thread — M6, M8, M10, M12. Fits standard metric nuts, washers, shackles, and rigging hardware. No adapters required.
✅ Key Features of These Stainless Steel Expansion Eyebolts
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304 Stainless Steel Construction — Resists rust, oxidation, and surface corrosion in outdoor, humid, and mildly coastal environments without painting or coating.
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Closed Ring Head Design — The fully enclosed eye provides a secure attachment point for hooks, shackles, carabiners, and wire rope — no risk of accidental disengagement under load.
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Wide Size Range (M6–M12, 50–150mm) — Covers light-duty picture hanging anchors up to heavy-duty overhead rigging bolts, so you can match the fastener to the actual load requirement.
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Standard Metric Coarse Thread — ISO metric threading ensures compatibility with off-the-shelf metric nuts, washers, and rigging hardware available at any hardware store.
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Expansion Anchor Mechanism — The wedge-style expansion sleeve locks into drilled concrete or masonry as the bolt is tightened, creating a mechanical interlock that resists pull-out forces.
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Flexible Quantity Options — Available in packs of 1, 5, 10, or 50 pieces, making these concrete ring anchor bolts practical for single repairs and bulk contractor installs alike.
📐 Technical Specifications — Expansion Eyebolts
| Material |
304 Stainless Steel |
| Head Style |
Closed Ring (Eye) |
| Thread Standard |
ISO Metric Coarse (DIN standard) |
| Thread Diameters |
M6, M8, M10, M12 |
| Available Lengths |
50mm (≈2.0"), 60mm (≈2.4"), 70mm (≈2.8"), 80mm (≈3.1"), 90mm (≈3.5"), 100mm (≈3.9"), 120mm (≈4.7"), 150mm (≈5.9") |
| Anchor Type |
Mechanical Expansion (Wedge Sleeve) |
| Base Material Compatibility |
Solid concrete, solid brick, dense masonry |
| Finish |
Natural stainless (brushed/mill finish) |
| Quantity Options |
1 pc, 5 pcs, 10 pcs, 50 pcs |
| Corrosion Resistance |
Suitable for outdoor and humid environments; see variant options for size-specific data |
| Working Load Limit |
See variant options — varies by diameter and embedment depth |
| Country of Origin |
Contact us to confirm |
❓ Frequently Asked Questions
How do I choose the right length for my expansion eyebolt?
Match the bolt length to the base material thickness plus the required embedment depth. As a general rule, embedment should be at least 10× the bolt diameter. For example, an M8 bolt typically needs at least 80mm (≈3.1") of embedment into concrete. Add the fixture thickness on top of that to determine the total length you need. When in doubt, go one size longer — excess length can be managed with a nut and washer.
What load can these expansion eyebolts handle?
Working load limits depend on bolt diameter, embedment depth, and base material strength. As a general reference, M6 eyebolts typically handle light-duty loads up to around 50–80 kg vertically in solid concrete, while M12 eyebolts can generally support several hundred kilograms. Always consult a structural engineer for safety-critical overhead rigging applications, and never exceed the manufacturer's rated working load.
Are these eyebolts suitable for outdoor or marine use?
Yes. The 304 stainless steel construction provides solid corrosion resistance in most outdoor environments including rain, humidity, and mild coastal exposure. For highly aggressive marine or saltwater environments, 316 stainless steel is generally recommended for longer service life. If you're unsure, contact us and we can advise on the right grade for your application.
What thread standard do these use — are they compatible with standard metric nuts?
These expansion eyebolts use standard metric coarse threads (ISO metric). They are compatible with standard metric nuts and washers of the corresponding size (M6, M8, M10, or M12). No special tooling or adapters are required — any hardware store metric nut will fit.
Can I use these in brick or block walls, or only concrete?
Expansion eyebolts are designed primarily for solid concrete and solid masonry. Performance in hollow block, aerated concrete (AAC), or soft brick is generally reduced and may not be reliable for load-bearing applications. For those substrates, a chemical anchor or sleeve anchor is typically a better choice. Always verify the base material before installation.
How many pieces do I need to order — can I buy just one?
Yes. Each size is available in quantities of 1, 5, 10, or 50 pieces. Select the quantity that matches your project needs from the options above. Bulk packs of 50 offer the best per-unit value for contractors or larger installations.
What drill bit size do I need for installation?
Use a carbide-tipped masonry or hammer drill bit that matches the bolt's nominal diameter. For example, use a 6mm bit for M6, an 8mm bit for M8, a 10mm bit for M10, and a 12mm bit for M12. Drill depth should equal the bolt's embedment length plus a small clearance (typically 5–10mm) for dust. Clean the hole thoroughly with compressed air or a brush before inserting the anchor.
🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.
