Hot Dipped Galvanized (HDG) Bolts are high-performance industrial fasteners coated with a thick layer of zinc through a meticulous hot-dip galvanizing process. This zinc coating provides exceptional corrosion resistance, making them ideal for outdoor and highly corrosive environments. Shanxi Xinshunda Flange Manufacturing Co., Ltd. manufactures HDG bolts in various standards (ASTM, DIN, ISO) and materials, ensuring strict dimensional accuracy and long-lasting durability. Comprehensive test reports and customization options are available upon request.
Production Details
Our ASTM A193 bolts are produced using state-of-the-art CNC machinery to ensure every thread and hexagonal head meets precise engineering drawings. The raw materials undergo strict chemical composition analysis before entering the production line. Each fastener is subjected to rigorous surface inspection to ensure the absence of defects such as cracks, laps, or improper coating. The dimensional accuracy is verified using advanced measuring instruments, ensuring a perfect match with your mating flanges.
Product Properties and Application
Product Properties
Superior Corrosion Resistance: The thick zinc coating protects the base metal from rust and oxidation, even in harsh weather conditions.
High Tensile Strength: Manufactured from high-grade steel to withstand heavy loads and structural stress.
Long Service Life: Significantly extends the lifespan of the fastener, reducing maintenance and replacement costs.
Excellent Adhesion: The metallurgical bond formed during the hot-dip process ensures the zinc layer does not easily peel or flake off.
Application
Hot Dipped Galvanized Bolts are extensively used in outdoor and heavy industrial applications, including Construction & Structural Engineering (steel structures, bridges), Power Transmission & Telecommunication Towers, Marine & Offshore equipment, Railway infrastructure, and general Outdoor Fabrication where protection against the elements is critical.
|
Parameter |
Specification |
|
Standard |
ASTM A325, ASTM A490, DIN 931, DIN 933, ISO 4014, ISO 4017 |
|
Product Type |
Hex Bolt, Heavy Hex Bolt, Structural Bolt |
|
Material |
Carbon Steel (Grade 4.8, 8.8, 10.9, 12.9), Alloy Steel, Stainless Steel |
|
Size Range |
1/4" to 4" (Metric M6 to M100) |
|
Length |
10mm to 500mm (or as per customer's drawing) |
|
Thread Type |
UNC (Coarse), UNF (Fine), Metric (MM) |
|
Surface Finish |
Hot Dipped Galvanized (HDG) - ASTM A153 / ISO 1461 |
|
Zinc Coating Thickness |
50μm - 80μm (approx. 350 - 560 g/m²) |
|
Packing |
Plywood Cases, Wooden Pallets, or Custom Packaging |
Physical Properties
|
Property |
Value |
|
Tensile Strength |
800 MPa - 1200 MPa (depending on grade, e.g., 8.8 / 10.9) |
|
Yield Strength |
640 MPa - 1080 MPa |
|
Elongation |
Min. 12% - 15% |
|
Hardness |
22 HRC - 39 HRC |
|
Coating Hardness |
Approx. 70-90 on the Shore scale |
QA & QC
At Shanxi Xinshunda, we implement a rigorous Quality Control system for our HDG bolts. Every batch undergoes Visual Inspection, Dimensional Checks, Tensile Testing, and Coating Thickness Measurement (using magnetic gauges). We ensure full compliance with ASTM A153 and ISO 1461 standards. Mill Test Certificates (EN 10204 3.1) are provided with every shipment.
Packing, Storage, Handling and Transportation
To prevent damage to the zinc coating, HDG bolts are carefully packaged in standard plywood cases or wooden pallets. Non-metallic spacers are used between layers to avoid friction. Each package is clearly labeled with product details, size, quantity, and batch number. Store in a well-ventilated, dry area. Avoid dragging the bolts during handling to maintain the integrity of the galvanized layer.
Strategic Partners with Shanxi Xinshunda
With over 15 years of manufacturing expertise, Shanxi Xinshunda Flange Manufacturing Co., Ltd. has successfully supplied premium flanges and fasteners to 3,800+ customers across 70+ countries. We are committed to being your trusted partner in the global energy, construction, and infrastructure sectors.
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