Hot-Dip Galvanized (HDG) Hex Nuts are high-strength nuts coated with a thick zinc layer via hot-dip galvanization, providing superior corrosion resistance for outdoor, marine, and industrial applications. Manufactured from carbon steel (Grade 4, 5, 8) or alloy steel (ASTM A325/A490), they feature precise hexagonal geometry for torque compatibility with bolts and comply with global standards like ASTM A153 and ISO 4034.
- Material:
- Carbon Steel: Grade 4 (soft), Grade 5 (medium-strength), Grade 8 (high-strength).
- Alloy Steel: Heat-treated for structural applications (e.g., bridges, buildings).
- Size Range:
- Metric: M6–M100 (ISO 4032, ISO 4034).
- Imperial: 1/4"–4" (UNC/UNF, ASME B18.2.2).
- Coating:
- Hot-Dip Galvanized: Zinc layer thickness ≥85μm (ASTM A153), salt spray resistance ≥1,000 hours.
- Thread Class: 6H (metric), 2B (imperial); heavy-duty variants for high-torque use.
- Design: Standard hexagon, thin (lightweight), or heavy (extra thickness for strength).
- Standard Carbon Steel HDG Nuts (M8–M30): 5,000 pieces (in-stock sizes).
- Alloy Steel HDG Nuts (ASTM A325/A490): 2,000 pieces (project-based orders).
- Oversized Nuts (M48+): 1,000 pieces (custom manufacturing).
Factory Advantages: ISO 1461-certified galvanizing lines, full compliance with EN 10204-3.1 material reports, and support for non-standard thread pitches or anti-seize coatings (e.g., PTFE over HDG) with lead times of 15–30 days.
- Infrastructure: Bridges, transmission towers, and highway guardrails (long-term outdoor corrosion protection).
- Marine Engineering: Offshore platforms, ship hulls, and dock equipment (316 SS HDG options available).
- Industrial Machinery: Heavy equipment in mining, oil & gas, and chemical plants (resists salt, moisture, and chemicals).
- Renewable Energy: Wind turbine bases, solar panel mounts, and hydroelectric facilities.
- Corrosion Resistance:
- HDG coating forms a sacrificial zinc layer that protects steel from rust even if scratched.
- Meets CSA S16 (Canada) and BS EN 1090 (Europe) for structural anti-corrosion requirements.
- High Strength: Grade 8 nuts offer tensile strength up to 1,040 MPa for critical load-bearing connections.
- Torque Compatibility: Standard hex design works with impact wrenches, sockets, and automated assembly tools.
- Coating Upgrades:
- HDG + Dacromet: Dual-layer protection for extreme environments (2,000+ hours salt spray).
- Color-Tinted HDG: Yellow, blue, or clear zinc finishes for aesthetic or traceability needs.
- Thread Modifications: Left-hand threads, metric-imperial hybrid threads, or precision threads (class 4H/5H).
- Markings: Laser-engraved grade symbols (e.g., "8" for Grade 8 nuts) or customer logos.
- Longevity: 50+ years of corrosion protection in standard environments (ASTM A123 compliance).
- Cost-Effective: Single coating process eliminates need for frequent re-painting or replacement.
- Sustainability: Recyclable zinc coatings and energy-efficient galvanizing processes.
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Request a quote for hot-dip galvanized hex nuts! Factory-direct supply ensures durable, code-compliant fasteners for infrastructure, marine, and industrial projects worldwide.
