Hot-Dip Galvanized Expansion Anchor Bolts | Heavy Duty Carbon Steel Wedge Anchors

Product Highlights

• High Torque Hex Head Design: Engineered with a precision external hexagon head, optimized to withstand high torque installation without rounding or head slippage during heavy-duty assembly.
• Premium Coastal Rust Prevention: Available in professional SS304 and marine-grade SS316 (Grade A4-80), providing exceptional defense against salt spray, tropical rain, and intense humidity across Southeast Asian project environments.
• Full & Half Thread Flexibility: Manufactured in strict alignment with global standards (DIN933 full thread / DIN931 half thread) to meet diverse mechanical shear and loading calculations.
• Passivated Anti-Galling Finish: Advanced surface polishing and chemical passivation treatments ensure ultra-smooth thread rolling, significantly reducing thread freezing or galling risks.
• Industrial Structural Rating: Features high tensile strength and rock-solid mechanical stability, making it an unyielding structural hardware link for demanding outdoor setups.

Product Specifications

📦 Packing & Logistics Data

• Standard Bulk Packaging: 25 kg packed inside reinforced 5-layer corrugated boxes, securely banded on standard non-fumigation export wooden pallets (approx. 1 to 1.2 tons per pallet).
• Anti-Humidity Sea Shield: Each box is lined with a heavy-duty waterproof plastic sealing bag to completely protect precision threads from marine corrosion during long-haul tropical sea transport.
• Distributor Custom Labeling: Supports private box packaging design (e.g., 50, 100, or 200 pcs/box) with customized B2B barcode labels and brand logos for regional retail distribution.
• Container Volume Maximization: Accommodates 20 to 25 metric tons per 20ft container (20GP), optimized to clear weight restriction thresholds in major Southeast Asian ports like Bangkok, Manila, and Jakarta.

Manufacturing Standards & Dimension Correspondence

We strictly manage thread rolling tolerances to guarantee flawless engagement under industrial load ratings:

• Flawless Fitment Tolerance: Thread dimensions are held to tight micrometric boundaries, ensuring 100% smooth engagement with matching DIN934 hex nuts.
• Head Stamp Traceability: Supports customized head stamps showing structural grade ratings (e.g., "A4-80", "THE") and your unique factory tracking logos.
• Pitch Precision Options: Standard metric coarse pitches as default; fine pitch alternatives are customizable for specialized high-vibration automotive or piping layouts.

Application Scenarios

Widely deployed in municipal construction framing, solar panel tracking structures (especially coastal solar PV farms), marine hardware assembly, food processing production lines, chemical pipeline grids, and automated machinery manufacturing. It provides robust, corrosion-free anchoring for outdoor steel joints and high-salinity infrastructure installations throughout tropical and island networks.

Why Choose Us?

• Direct Source Factory Pricing: Located in the heart of Handan's massive fastener hardware industrial base, bypassing intermediate trading marks to maximize your B2B margin profiles.
• Substantial Sizing Inventory: We maintain huge stock reserves of standard sizes (M6 to M20 in DIN933/DIN931), enabling immediate order processing and dispatch within 1–3 working days.
• Comprehensive Metrology Auditing: Our lab conducts rigorous batch tensile verification, micro-hardness charting, and 100% chemical spectrometer tests to guarantee true nickel/chromium content.
• Flexible OEM Drawing Support: Rapid response to customized thread configurations, non-standard lengths, or specific surface finishes with short project lead times.

Commercial & Sourcing Terms

• MOQ (Minimum Order Quantity): 100 pieces for standard ready-to-ship inventory sizes. A baseline MOQ of 1,000 pieces per size applies for custom production runs.
• Wholesale Tier Pricing: Clear volume-discount matrices tailored for long-term project buyers (1,000–19,999 pcs / 20,000–99,999 pcs / ≥ 100,000 pcs).
• Production Lead Times: 7–10 days for standard warehouse configurations; 20–30 days for massive factory custom runs with customized markings.
• Accepted Payments: T/T (Telegraphic Transfer), Irrevocable L/C at sight, or PayPal for sample verification runs.

Frequently Asked Questions

Q1: How do I know whether to order SS304 or SS316 hex bolts for my market?

SS304 (A2-70) is ideal for standard outdoor construction, machinery assembly, and everyday rain exposure. However, for severe marine environments, coastal infrastructure, or chemical contact zones in Southeast Asia, we strongly recommend SS316 (A4-80) due to its molybdenum content, which stops pitting corrosion from saltwater.

Q2: How does Hotop Fasteners prevent thread locking (galling) during automatic assembly?

Thread galling is common with stainless steel hardware under high-speed friction. We overcome this by utilizing precise automated thread-rolling machines and applying a specialized surface passivation finish to lower friction. We also recommend using low-speed torque tools or thread lubricants during on-site installation.

Q3: Do you provide official EN 10204 3.1 Material Test Certificates (MTC)?

Yes. For every bulk shipment, we supply comprehensive MTCs detailing chemical analysis (precise Chromium, Nickel, and Carbon percentages) alongside actual structural proof load tests to facilitate your engineering project clearance approvals.

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We support full product customization, sample testing, and flexible batch orders with strict quality assurance and on-time delivery. Contact us now to get a free tailored quote and professional technical support!