Our 304 stainless steel external expansion anchor bolt is made of 304 stainless steel (A2-70, tensile ≥520MPa, yield ≥205MPa), with carbon steel Grade 4.8/8.8 optional. The external expansion sliding mechanism – as the hex nut is tightened, the tapered shank forces the expansion sleeve outward against the hole wall, creating a powerful anchorage. The extended sleeve design accommodates thick walls and aerated blocks requiring deep embedment. The smooth shank ensures easy insertion. Sizes M6‑M16, lengths 60‑200mm custom. Suitable for structural reinforcement, heavy equipment installation, outdoor safety facilities, and industrial racking. Installation: drill → clean hole → insert anchor → tighten hex nut with wrench.
304 Stainless Steel Hex Sleeve Anchor Bolts External Expansion Wall Anchors Heavy Duty Concrete Anchors
Manufacturing Process
• Multi Station Cold Heading Technology
• Intelligent Heat Treatment System
• Micron-Level Thread Rolling Process
• Fully Automatic Optical Sorting
• Environmentally Friendly Surface Treatment Line
• Metallographic And Mechanical Joint Laboratory
Quality Control System
• Raw Material Source Locking
• Furnace Number Batch Full Traceability
• Third Party Material Certification
• Process Parameters Open And Transparent
• Salt Spray Test Real Time Monitoring
• International Standard Compliance Declaration
Flexible Customization Capability
• Customizable head/slot Shapes
• Extreme Application Of Special Materials
• Breakthroughs In Extra Large/Long Specifications
• Integrated Assembly Of Components
• Customizable Surface Treatment Colors
• Personalized Packaging And Labeling
Technical Service
• On-Site Failure Analysis
• Selection Calculation And BOM Optimization
• Installation Tool Selection Guidance
• Inventory Management (VMI) Trusteeship
• Free Sample Making And Testing
• International Standard Translation And Interpretation
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304 Stainless Steel – Corrosion & Aging Resistant
Made of AISI 304 stainless steel (A2-70), with ultimate tensile ≥520MPa and yield ≥205MPa. Mirror-polished and passivated for a dense chromium oxide film that effectively resists acids, alkalis, seawater, and industrial pollutants. Ideal for coastal construction, outdoor safety facilities, and damp factories – remains rust-free and pit-free for decades, with consistent anchoring strength, eliminating structural risks caused by corrosion.
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External Sliding Expansion – Deep Anchoring in Thick Walls
The external sliding expansion mechanism – as the hex nut is tightened, the tapered screw expands the sleeve uniformly outward, gripping the hole wall 360° for high tensile and shear strength. The extended sleeve design is tailored for thick walls, aerated blocks, and insulated composite walls – delivering anchoring depth far beyond ordinary bolts, fully utilizing the substrate's deep-layer strength. Smooth sleeve body ensures easy insertion, making installation fast and efficient.
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Extended Design for Fatigue Resistance – Heavy Loads Stay Secure
The extended sleeve not only increases anchoring depth but also disperses load stress, reducing edge concentration at the hole mouth and enhancing overall fatigue performance. Proven in cyclic pull-out and vibration tests, this anchor withstands alternating loads in heavy equipment, warehouse racking, and industrial plants – no shifting, no loosening. The mirror-polished surface reduces installation friction and protects hole integrity, offering a service life far exceeding standard galvanized carbon steel anchors with minimal maintenance costs.
Factory Environment
Industrial Capabilities
• Factory Area: 8,000 square meters
• Certifications: ISO, IATF, CE, RoHS, JIS, ASTM
• Manufacturing : 70+ internationally advanced production lines
• Testing: 30+ sets of precision quality testing equipment
• Annual Output: Up to 50,000,000 tons
From Raw Materials to Completed Items
In order to enable closed-loop manufacturing from raw materials to final items, our firm provides fully automated production tools for cold heading, precision thread rolling, controlled-atmosphere heat treatment, and environmentally friendly surface finishing. Every fastener exceeds stringent specifications for strength, precision, and surface quality because to inline optical sorting and a digital MES. Your assurance of high-quality fasteners: they are stable, functional, and environmentally friendly.
Innovation Lab:
We are always looking for new ideas because of our experience and teamwork. Do you have a project? Now let's begin.
"Customized Implementation" to "Pain Point Diagnosis" in the Whole Joint R&D Process
We provide more than just standard parts. From the beginning, our varied engineering staff has been actively involved in your project. In the lab, we swiftly modify solutions by carefully analyzing the application environment. Because of this smooth transition between technology and application, creative ideas are swiftly turned into practical solutions that reduce lifetime costs.
Integrated Verification System: Ensuring Innovation with "Test Data"
Innovation goes beyond the drawing board. We offer one-stop verification for everything from corrosion testing to prototype development through our in-house technical center. Through extensive simulated working condition tests, we use empirical data to confirm the performance stability of tailored solutions. This significantly reduces project risks while also attaining truly reliable cost reduction and efficiency improvement.
