DIN 125 Zinc Plated Wedge Expansion Anchor with Hex Nut Grade 8.8 Silver Heavy Duty Concrete Fastening Bolt
Detailed Product Description
| Product Name | Wedge Expansion Anchor with Hex Nut | Color | Silver (Zinc Plated) |
|---|---|---|---|
| Standard | DIN 125 / EN 125 | Material | Carbon Steel Grade 8.8 |
| Thread Diameter | M6 – M24 (1/4″ – 1″) | Anchor Length | 40 mm – 300 mm (standard; custom available) |
| Anchor Type | Wedge expansion (conical expansion) | Nut Type | Hex Nut (Grade 8.8, included) |
| Strength Grade | Grade 8.8 (800 MPa tensile) | Surface Finish | Zinc Plated (bright silver) |
| Base Material | Solid Concrete (C20/25 and above) | Setting Tool | Torque wrench or impact driver |
| Brand Name | TOBO | Place of Origin | China |
DIN 125 Zinc Plated Wedge Expansion Anchor with Hex Nut – Grade 8.8 – Silver – Heavy Duty Concrete Fastening Bolt
Wedge expansion anchors are heavy‑duty mechanical fasteners designed for secure attachment into solid concrete. The anchor consists of a threaded bolt, a conical expansion clip (wedge), and a matching hex nut. When tightened, the wedge is pulled into the expansion clip, forcing it outward against the concrete hole wall. This creates a friction‑based mechanical interlock that provides high load‑bearing capacity. Grade 8.8 carbon steel delivers 800 MPa tensile strength for structural and industrial applications. Zinc plating offers moderate corrosion resistance for indoor and general‑purpose environments. The anchor is supplied complete with hex nut and washer – ready for installation.
Product Description
Specifications – Wedge Expansion Anchor (DIN 125) with Hex Nut
| Parameter | Details |
|---|---|
| Standard | DIN 125 / EN 125 (wedge anchor type) |
| Thread sizes | M6, M8, M10, M12, M16, M20, M24 (metric); 1/4″ – 1″ UNC (inch) |
| Anchor lengths | 40 mm – 300 mm (standard); custom lengths on request |
| Diameter (anchor body) | Larger than threaded portion; matches standard drill bit |
| Drill bit size | Anchor diameter + 1‑2 mm (e.g., M10 uses 12mm bit; M12 uses 14mm bit) |
| Nut type | Hex nut (included, Grade 8.8) |
| Washer | Flat washer (included, Grade 8.8) |
| Embedment depth | Minimum: 1.5× anchor diameter; recommended: per technical data |
| Hole tolerance | ±0.3 mm (critical for expansion performance) |
| Setting torque | Per manufacturer specification (varies by size) |
| Proof load (ultimate) | 2 × working load (as per ETA / ETAG 001) |
| Base material | Solid concrete C20/25 minimum; not for hollow or cracked concrete (unless certified) |
Product Parameters
| Product Name | Wedge Expansion Anchor – Full Assembly |
|---|---|
| Material | Carbon Steel Grade 8.8 (quenched & tempered) |
| Place of Origin | China |
| Standard | DIN 125 / EN 125 |
| Thread | M6 – M24 (metric coarse) or UNC (inch) |
| Anchor length | 40 – 300 mm |
| Grade | 8.8 (800 MPa tensile) |
| Surface | Zinc plated (bright silver) |
| Included components | Hex nut + flat washer (same grade) |
| Brand | TOBO |
| MOQ | 500 sets (small orders negotiable) |
Chemical Composition (Grade 8.8 – Carbon Steel)
| Element | Composition (%) – typical |
|---|---|
| Carbon (C) | 0.25 – 0.55 (max) |
| Silicon (Si) | ≤ 0.30 |
| Manganese (Mn) | 0.40 – 0.80 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | ≤ 0.30 (optional) |
| Iron (Fe) | Balance |
Note: Actual composition varies by melt; all materials meet EN 10204 3.1 requirements.
Mechanical Properties (Grade 8.8)
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 800 MPa (min) |
| Yield strength (Rp 0.2) | ≥ 640 MPa (min) |
| Elongation after fracture | ≥ 12 % |
| Reduction of area | ≥ 52 % |
| Hardness (Rockwell C) | 22 – 32 HRC |
| Proof load (stress at 0.2% offset) | ~640 MPa |
Physical Properties (Typical)
| Density | 7.85 g/cm³ |
|---|---|
| Modulus of elasticity | 210 GPa |
| Working temperature range | -40°C to +200°C (zinc plating stable up to ~120°C) |
| Coating thickness (zinc) | 5 – 15 µm (per standard) |
| Salt spray resistance | ~96 hours (zinc plated) |
Main Characteristics
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Mechanical wedge expansion – the conical wedge is drawn into a clip, expanding it against the hole wall; no chemical bonding required.
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Positive mechanical interlock – provides immediate load‑bearing capacity upon installation; no curing time.
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Grade 8.8 strength – 800 MPa tensile for structural and heavy‑duty industrial applications.
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Complete assembly – supplied with hex nut and flat washer of matching strength grade – ready to install.
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Drill hole tolerance – requires standard drill bit; hole diameter must match anchor size for reliable expansion.
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Corrosion resistance – zinc plating provides moderate protection for indoor and semi‑outdoor applications.
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Reusable – anchor can be removed (by unscrewing) and re‑installed in a new hole; not recommended for re‑use in the same hole.
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Easy installation – using standard torque wrench or impact driver; no special tools required.
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Depth control – anchor is fully set when the nut is tightened to the specified torque and the sleeve is fully expanded.
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Not for cracked concrete – standard wedge anchors are not certified for cracked concrete unless specifically rated (e.g., with special undercut design).
Product Applications (4 Key Uses)
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Structural steel mounting – securing steel columns, beams, base plates, and safety barriers to concrete foundations in industrial and commercial buildings.
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Heavy machinery anchoring – fixing compressors, pumps, turbines, generators, and large industrial equipment to concrete floors.
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Overhead and slab mounting – attaching pipe hangers, cable trays, conduits, and HVAC equipment to concrete ceilings and slabs.
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Civil and infrastructure works – anchoring bridge parapets, highway signs, crash barriers, and wind turbine tower bases.
Product Advantages (4 Key Benefits)
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Immediate load capacity – unlike chemical anchors, wedge anchors provide instant holding power upon tightening – no waiting for curing.
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High strength in concrete – Grade 8.8 steel and mechanical wedge design deliver reliable performance in solid concrete with minimal edge distance requirements.
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Complete set – anchor, nut, and washer are supplied together, reducing parts management and ensuring correct grade matching.
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Simple installation – uses standard rotary hammer drill and torque wrench; no specialised training or expensive setting tools required.
Product Functions (4 Key Features)
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Wedge expansion mechanism – when the nut is tightened, the threaded bolt pulls the wedge upward, forcing the expansion clip outward against the concrete hole wall.
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Friction lock – the expanded clip creates radial pressure that develops friction‑based holding force, transferring load from the fixture into the concrete.
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Secure fastening – once set, the anchor resists tension (pull‑out) and shear (side) loads, keeping the attached fixture securely in place.
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Removable (if needed) – the bolt can be unscrewed and removed; the expansion sleeve remains embedded in the concrete (anchor is not reusable in the same hole).
Our Service
Why Choosing TOBO Metal Industrial:
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Sufficient Forging, Machining, and Heat Treatment Equipment
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In‑house Inspection Instruments for Quality Control
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Competitive Price & High Quality Assurance
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Fast, Effective and Efficient Services
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Experienced Professionals in Communication
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Full traceability with mill test reports (EN 10204 3.1 / 3.2)
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Torque and pull‑out testing available in‑house
Our Company
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We are one of the Professional Manufacturers and Exporters of Pipeline Products and Fasteners in China. Our company was established in 1998, the plant covers 550,000 square metres with a construction area of 68,000 square metres, employing 260 workers and 45 technicians.
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We have five branch factories which can supply the best quality pipes, tubes, fittings, flanges, fasteners, and related accessories. Now, we own a number of advanced production equipments, including metal processing, forging, machining, cold forming, and heat treatment facilities. Annual production capacity exceeds 60,000 tons. Our company maintains various detection devices, such as non‑destructive testing, chemical analysis, metallographic examination, and physical experiments. Main products include expansion anchors, wedge anchors, bolts, screws, nuts, washers, pipes, fittings, and flanges, in carbon steel, stainless steel, alloy steel, and copper‑nickel materials.
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Additionally, we are authorised by more than 120 top‑class mills from South Korea, Japan, and China, including JFE, SUMITOMO, POSCO, BAOSTEEL, TISCO, LISCO, TPCO, HENGYANG VALIN, and others.
Packing & Delivery
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Packing Details: Cartons + wooden pallets, or as per customer requirement (e.g., plastic bags, bulk drums, shrink‑wrapped layers).
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Delivery Details: 7‑15 days after the purchase order (stock items); 20‑30 days for custom orders.
FAQ
Q: Are you a trading company or manufacturer?
A: We are a factory with direct production capabilities.
Q: How long is your delivery time?
A: Generally 5‑10 days if the goods are in stock. For custom orders, 15‑20 days depending on quantity and specifications.
Q: Do you provide samples? Is it free or extra?
A: Yes, we could offer samples free of charge, but the customer pays the freight cost.
Q: What are your terms of payment?
A: Payment ≤ 1000 USD, 100% in advance. Payment ≥ 1000 USD, 50% T/T in advance, balance before shipment.
Q: Can this anchor be used in cracked concrete?
A: Standard wedge anchors (DIN 125) are not rated for cracked concrete. For cracked concrete applications, please specify our self‑undercut or seismic‑rated anchors.
Q: What drill bit size do I need?
A: The standard drill bit diameter is anchor diameter + 1‑2 mm. For example: M10 anchor → 12 mm drill bit; M12 → 14 mm drill bit. Please check technical data sheet for specific sizes.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.