Premium Hot‑Dip Galvanized Hex Bolts from China – Q235 HDG ISO‑Certified
FOB Price | 1,000 pieces (Min. Order)
Custom specifications and OEM service available
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Product Description
These Hot-Dip Galvanized Hex Bolts (Q235 + HDG) are manufactured in our ISO-certified Chinese factory, ensuring quality and competitive pricing. Made from Q235 steel with a durable hot-dip galvanized coating, they resist corrosion for outdoor construction, machinery and infrastructure applications. The hex head design allows easy installation, with 30mm-120mm lengths available to suit various needs. Compatible with hex nuts or flange nuts, they provide secure fastening for structural joints, equipment clamping and base anchoring. The HDG coating ensures reliable performance in harsh conditions, making them a cost-effective solution for industrial and construction projects worldwide.
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Product Specifications
| Parameter | Details |
|---|---|
| Product Name | Hot-Dip Galvanized Hex Bolt |
| Material | Q235 steel |
| Head Type | Hex Head |
| Available Lengths | 30mm -120mm (various options) |
| Matching Nut | Hex nut, flange nut |
| Application Area | Frame joints, clamp locking, base anchoring |
| Torque Standard | Recommended torque: 12-16 Nm |
| Features | 10+ years of corrosion resistance |
Galvanized hex bolts Size Specifications – Available Sizes
| Thread Diameter (M) | Standard Notation (M×L) | Imperial Equivalent (inch) |
|---|---|---|
| M8 | M8×20mm, M8×20mm, M8×25mm, M8×30mm | 5/16″×0.8″, 5/16″×1.0″, 5/16″×1.2″ |
| M10 | M10×20mm, M10×25mm, M10×30mm, M10×35mm | 3/8″×0.8″, 3/8″×1.0″, 3/8″×1.2″, 3/8″×1.4″ |
| M12 | M12×25mm, M12×30mm, M12×35mm, M12×40mm | 1/2″×1.0″, 1/2″×1.2″, 1/2″×1.4″, 1/2″×1.6″ |
| M14 | M14×30mm, M14×35mm, M14×40mm | 9/16″×1.2″, 9/16″×1.4″, 9/16″×1.6″ |
| M16 | M16×30mm, M16×35mm, M16×40mm | 5/8″×1.2″, 5/8″×1.4″, 5/8″×1.6″ |
| M18 | M18×50mm, M18×60mm, M18×70mm | 11/16″×2.0″, 11/16″×2.4″, 11/16″×2.8″ |
| M20 | M20×40mm, M20×45mm, M20×50mm, M20×55mm | 3/4″×1.6″, 3/4″×1.8″, 3/4″×2.0″, 3/4″×2.2″ |
| M22 | M22×70mm, M22×80mm, M22×90mm, M22×100mm | 7/8″×2.8″, 7/8″×3.1″, 7/8″×3.5″, 7/8″×3.9″ |
| M24 | M24×50mm, M24×60mm, M24×70mm, M24×75mm | 15/16″×2.0″, 15/16″×2.4″, 15/16″×2.8″, 15/16″×3.0″ |
| M27 | M27×70mm, M27×80mm, M27×90mm | 1-1/16″×2.8″, 1-1/16″×3.1″, 1-1/16″×3.5″ |
| M30 | M30×70mm, M30×80mm, M30×90mm | 1-3/16″×2.8″, 1-3/16″×3.1″, 1-3/16″×3.5″ |
| M33 | M33×110mm, M33×120mm, M33×130mm | 1-5/16″×4.3″, 1-5/16″×4.7″, 1-5/16″×5.1″ |
Applications
Hot‑Dip Galvanized Hex Bolts are widely used across multiple industries requiring corrosion-resistant, high-strength fastening solutions. With a 50 µm zinc coating and weatherproof durability, they perform reliably in demanding outdoor environments.
Solar Steel
Hot‑Dip Galvanized Hex Bolts are widely used in solar steel structures, providing strong and corrosion-resistant fastening for PV racking systems in both ground-mount and rooftop installations. The HDG coating ensures long-term durability in outdoor environments.
Construction
Ideal for steel structure connections, telecom towers, and utility infrastructure, these bolts offer ISO 9001 and CE-certified reliability for demanding construction applications.
Industrial Equipment
Used in machinery, processing systems, and heavy infrastructure, where RoHS-compliant corrosion-resistant fasteners are essential for safety and longevity.
Commercial Solar
Perfect for large-scale commercial solar installations, including flat roof and open field systems. Ensures secure connections with 50 µm HDG coating and weather resistance.
Residential Solar
Reliable for home rooftop solar systems, offering weatherproof, secure fastening in variable climates.
Utility Projects
Trusted in long-span utility-scale projects, including solar farms, wind farms, and substations. Performs consistently under extreme weather conditions and outdoor exposure.
Certifications
Our products meet international quality standards and certifications:
- ISO 9001:2015 Quality Management System
- ISO 14001:2015 Environmental Management
- DIN 934 / ISO 4032 Standards Compliance
- ANSI B18.2.2 American Standards
- Third-party testing and certification
Packaging
Professional packaging solutions for safe transportation:
- 25kg cartons with inner plastic bags
- Custom branded packaging available
- Barcode and QR code labeling
- Moisture-proof and anti-corrosion protection
- Stackable design for efficient storage
Company Introduction
Welcome to Hebei Zixian Fasteners Co., Ltd. – Your Reliable Manufacturer of Galvanized Fasteners and Solar Mounting Accessories from China!
What we offer:
- Full in-house production – from raw materials to packaging
- Solar mid clamps, end clamps, brackets, galvanized bolts & nuts
- ISO-compliant quality control
- Competitive pricing & fast delivery
- OEM & custom fastener solutions for B2B buyers
Contact us today for product catalogs, samples, or quotes:
- Website: zixiansolarparts.com
- Email: xzi675763@gmail.com
- WhatsApp: +86 15630389170
Frequently Asked Questions
1. What are the technical specifications of your Galvanized Hex Bolts (Q235 + HDG)?
Our industrial-grade hex bolts are manufactured from Q235 carbon steel with Hot-Dip Galvanized (HDG) coating (minimum 50μm). Standard sizes range from M6-M20 in 30mm-120mm lengths, with full thread or partial thread options. Tensile strength meets 4.8 grade (400MPa).
2. Do you offer bulk availability for 30mm-120mm Galvanized Hex Bolts?
Yes, our factory maintains 200+ metric tons monthly capacity. All standard sizes are stock-ready with: MOQ: 1000 pieces (mix sizes accepted); Packaging: 25kg/carton or palletized; Lead time: 7-15 days for container loads.
3. How does your HDG coating compare to electroplating for marine applications?
Our HDG coating offers 5-7x longer lifespan than electroplated zinc with 1,200+ hours salt spray resistance (ASTM B117), providing complete coverage including threads and maintenance-free performance for 20+ years in coastal environments.
4. Do you provide certified matching nuts for structural applications?
We supply complete fastener solutions including Grade 8 HDG hex nuts (ISO 4032), flange nuts with integrated washers, pre-assembled bolt-nut sets, and custom kit packaging upon request.
5. Are your bolts approved for structural steel construction?
Our bolts are EN 14399-3 compliant for structural bolting, widely used in bridge building and power plants, with provided torque values and available third-party test reports.
Get in Touch
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Why Choose Us?
- ✓ 1-on-1 Expert Support – Custom solutions for your specific needs
- ✓ Factory Tours Available – Verify our quality standards in person
- ✓ Global Supply Experience – Trusted by clients in 15+ countries