M6 - M20 Stainless Steel Closed Hook Eye Bolt Shield Anchor Expansion Bolt - HomeDIYer

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M6-M20 Stainless Steel Closed Hook Eye Bolt Shield Anchor Expansion Bolt

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Size: M6 x 50mm

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Closed Hook Eye Bolt Shield Anchors — Secure Overhead Attachment Points in Concrete & Masonry

When you need a reliable anchor point in concrete, brick, or block — for hanging equipment, routing cables, securing safety lines, or mounting fixtures — a loose or undersized fastener is not an option. These M6–M20 closed hook eye bolt shield anchors give contractors, fabricators, and serious DIYers a mechanically locked attachment point that holds under sustained load.

Each anchor consists of a closed-loop eye bolt machined from A2 (304) stainless steel paired with a matching expansion sleeve. Thread diameters run from M6 (≈1/4") to M20 (≈3/4"), and shank lengths range from 50mm (≈2") to 250mm (≈9.8"), covering thin-slab and deep-embedment applications alike. Sold individually or in packs of 2 or 5 pieces.

Typical use cases include hanging heavy planters or lighting from concrete ceilings, anchoring swing sets and hammock posts to masonry walls, securing cable management runs in industrial facilities, and installing safety tie-off points in construction environments where a stainless steel expansion bolt anchor is required by code.

🔩 Compatibility: Fits standard ISO metric coarse-thread hardware (M6–M20). Designed for solid base materials — concrete, brick, natural stone, and dense block. Not suitable for hollow walls or soft substrates.

✅ Key Features of These Closed Hook Eye Bolt Shield Anchors

🔒Closed-Loop Eye Design — The fully enclosed hook prevents cables, shackles, or carabiners from slipping out under load, making it more secure than open-hook alternatives for overhead rigging and tie-off applications.
🦾Mechanical Expansion Hold — The sleeve-anchor mechanism expands against the drilled hole wall as the bolt is tightened, creating a friction-and-interlock grip that resists pull-out without adhesive or epoxy.
🌊A2 Stainless Steel Construction — Grade 304 stainless resists rust and surface oxidation in outdoor, humid, and mildly corrosive environments, extending service life compared to zinc-plated carbon steel anchors.
📐Wide Size Range (M6–M20, 50–250mm) — One product family covers light-duty cable hooks through heavy structural anchor points, reducing the need to source multiple fastener types for a single project.
⚙️Standard Metric Thread Compatibility — ISO coarse-thread profile mates directly with standard metric nuts, washers, and turnbuckles without adapters, simplifying assembly in mixed-hardware installations.
📦Flexible Pack Quantities — Available in 1, 2, or 5-piece packs so you can match your order to the exact number of anchor points needed, whether it's a single repair or a multi-point installation.

⚠️ Installation note: Drill hole diameter must match the anchor sleeve OD for your selected size. Always verify embedment depth and base material condition before applying load. For safety-critical overhead applications, consult a qualified engineer.

📐 Technical Specifications — Closed Hook Eye Bolt Shield Anchors

Product Type	Closed Hook Eye Bolt Shield Anchor (Sleeve Expansion Bolt)
Material	A2 Stainless Steel (Grade 304)
Thread Standard	ISO Metric Coarse (M6–M20)
Thread Diameter Range	M6 (≈1/4") — M20 (≈3/4")
Shank Length Range	50mm (≈2") — 250mm (≈9.8")
Head / Hook Style	Closed Round Eye (Loop)
Drive Style	One-Way (tighten by rotating bolt body)
Anchor Type	Sleeve / Shield Expansion
Suitable Base Materials	Concrete, brick, natural stone, dense block
End Type	Closed
Pack Quantities Available	1 pcs, 2 pcs, 5 pcs
Finish	Brushed stainless (natural mill finish)
Country of Origin	China
Recommended Drill Bit Type	See variant options
Minimum Embedment Depth	Contact us to confirm for your specific size

❓ Frequently Asked Questions

How do I choose the right size and length for my application?

Match the thread diameter (M6, M8, M10, M12, M14, M16, or M20) to your load requirements and the bolt hole size in your fixture. For length, a general rule is that the anchor should embed at least 4–6× the bolt diameter into the base material. For example, an M8 bolt typically needs at least 32–48mm of embedment depth. Quick inch reference: 50mm ≈ 2", 100mm ≈ 3.9", 150mm ≈ 5.9", 200mm ≈ 7.9", 250mm ≈ 9.8".

What load capacity can these eye bolt anchors handle?

Load capacity depends on thread diameter, embedment depth, and base material strength. Generally, larger diameters (M12–M20) handle heavier loads. Always consult a structural engineer for safety-critical overhead or dynamic load applications, and never exceed the working load limit for your specific size and installation conditions.

Are these eye bolts suitable for outdoor or wet environments?

Yes. A2 (304) stainless steel provides good corrosion resistance in most outdoor and humid environments, including rain exposure and moderate coastal proximity. For highly aggressive environments — such as direct saltwater splash zones or chemical-exposure areas — A4 (316) stainless steel is generally recommended instead.

What thread standard do these use — are they compatible with standard metric nuts and hardware?

Yes. These use standard ISO metric coarse threads (M6–M20), compatible with standard metric nuts, washers, turnbuckles, and shackles. Thread pitch follows standard metric coarse specifications — for example, M8 × 1.25mm pitch, M10 × 1.5mm pitch, M12 × 1.75mm pitch.

What base materials can these shield anchors be installed in?

These sleeve-style shield anchors are designed for solid base materials such as concrete, brick, block, and natural stone. They are generally not suitable for hollow walls, drywall, or soft materials without additional structural backing. Always confirm the base material is solid and free of cracks at the installation point.

How does the expansion mechanism work?

When the bolt is tightened, a cone at the tip draws the surrounding expansion sleeve outward, pressing it firmly against the walls of the drilled hole. This mechanical interlock creates a secure hold in the base material without adhesive. The result is a removable anchor — the bolt can typically be loosened and removed if needed, unlike epoxy-set anchors.

Should I buy 1, 2, or 5 pieces?

Choose based on your project scope. Single pieces (1 pcs) are ideal for one-off repairs or testing fit before committing to a larger order. Two-piece packs suit paired anchor points such as swing hangers, hammock ends, or cable runs. Five-piece packs offer the best per-unit value for fence posts, pergola frames, or any multi-point installation.

🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.

M6-M20 Stainless Steel Closed Hook Eye Bolt Shield Anchor Expansion Bolt

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Beschreibung

Closed Hook Eye Bolt Shield Anchors — Secure Overhead Attachment Points in Concrete & Masonry

✅ Key Features of These Closed Hook Eye Bolt Shield Anchors

📐 Technical Specifications — Closed Hook Eye Bolt Shield Anchors

❓ Frequently Asked Questions

M6-M20 Stainless Steel Closed Hook Eye Bolt Shield Anchor Expansion Bolt

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