The Zinc Plated Carbon Steel Wedge Anchor Mechanical Expansion Bolt (commonly known as a mechanical anchor, through bolt, concrete wedge anchor, heavy-duty expansion bolt, or concrete stud anchor) is an industry-standard torque-controlled mechanical anchor engineered for heavy-duty structural fixings into solid concrete, hard stone, and solid masonry structures. Comprising a threaded steel stud with a precision-forged conical end, a three-segment expansion clip collar, a heavy flat washer, a spring lock washer, and a heavy hex nut, driving and torquing the anchor pulls the cone upward into the clip collar. This forces the clip segments to expand radially and bite deeply into the concrete hole wall, creating a permanent, high-load mechanical anchor in strict compliance with global ISO standards.
Technical Specifications of Mechanical Wedge Anchor Expansion Bolts
We produce Class 4.8 and Class 8.8 carbon steel mechanical wedge anchors in both Electro-Zinc Plated (EG) and Hot-Dip Galvanized (HDG) anti-corrosion surface finishes. The pre-assembled through-bolt design allows direct installation through the fixture clearance hole, significantly cutting site assembly labor times.
| Parameter | Class 4.8 Electro-Zinc Wedge Anchor | Class 8.8 High Strength HDG Wedge Anchor |
|---|---|---|
| Steel Material Grade | Low Carbon Steel (Q235B) Class 4.8 | Medium Carbon Steel (45# Quenched) Class 8.8 |
| Tensile & Shear Performance | Standard Structural Tension Capacity | Heavy Structural Pull-Out & Shear Load Capacity |
| Expansion Clip Material | High-Toughness Stamped Carbon Steel Clip | Austenitic SS304 or Hardened Carbon Steel Clip |
| Protective Coating Thickness | 5 µm – 12 µm Electro-Zinc (Blue-White / Yellow) | 45 µm – 65 µm Hot-Dip Galvanized Coating |
| Suitable Base Material | Non-Cracked Concrete, Dense Natural Stone | Cracked & Non-Cracked Structural Concrete |
Precision Manufacturing and Working Mechanics of Mechanical Anchors
At our specialized manufacturing plant in Handan, China, mechanical wedge anchors undergo automated cold heading, clip stamping, thread rolling, galvanizing, and assembly:
- Multi-Station Conical Stud Cold Heading: High-tonnage cold formers forge steel wire into exact conical wedges and precise thread shanks, ensuring consistent expansion angles.
- Precision Expansion Clip Stamping: Automatic stamping presses form 3-segment expansion collars with knurled grip teeth that bite into concrete without spinning.
- Electro-Zinc Plating & Passivation: Trivalent chromium (Cr3+) electro-galvanizing applies a corrosion-resistant 5–12 µm zinc layer, followed by baking to prevent hydrogen embrittlement.
- 100% Pre-Assembly Inspection: Conical studs, expansion clips, flat washers, spring washers, and hex nuts are pre-assembled on automated lines for instant job-site installation.
Key Engineering Applications of Mechanical Wedge Anchors
Mechanical wedge anchors deliver unmatched structural clamping across major construction and infrastructure projects:
- Structural Steel Column Baseplates & Bridges: Anchoring heavy structural steel columns, crane runway beams, and bridge expansion joints into reinforced concrete pads.
- Glass & Aluminum Curtain Wall Framing: Securing aluminum facade brackets, stone cladding channels, and structural glass curtain wall supports.
- MEP, Cable Tray & Heavy Equipment Installation: Mounting high-capacity electrical cable management trays, heavy HVAC equipment bases, and industrial conveyor legs to concrete floors.
Quality Control and Export Packaging for Mechanical Anchors
Handan YiHao Fastener enforces strict Quality Assurance (QA) standards for all overseas export orders. Testing procedures include 100% concrete pull-out tension load tests, shear capacity tests, coating thickness measurement, and salt spray validation.
All export items are bulk packed in heavy-duty 25kg inner cartons, neatly stacked on ISPM 15 compliant fumigated wooden pallets, and wrapped in protective stretch film for safe ocean freight.
Request Factory Direct Pricing for Mechanical Wedge Anchors
Looking for a trusted manufacturer in Handan, China for carbon steel zinc plated or HDG wedge anchors / mechanical expansion bolts (Class 4.8 / Class 8.8)? Contact Handan YiHao Fastener today for technical datasheets, concrete pull-out load test reports, free samples, and direct bulk export quotes.
