Wholesale & Made to Spec Bolts Nuts (HDG) for Expressway Grade Applications
PB-Trading is a manufacturer and importer of bolts, nuts, washers, guardrail installation fittings, and grounding system equipment for large-scale projects such as highways, expressways, tollways, bridges, and other public infrastructure. All products are Hot Dip Galvanized (HDG) for superior corrosion resistance and durability. We provide custom manufacturing (Made-to-Spec) services and operate under Department of Highways (DOH) and Expressway Authority of Thailand (EXAT) standards covering every stage from design, production, and coating to on-site delivery with full quality certification for both government and private sector projects.
Key Features of PB-Trading HDG Bolts & Nuts
1. High Strength Steel for Superior Load Performance
- -Manufactured from industrial grade Carbon Steel or Alloy Steel, heat treated to achieve standardized tensile strength.
- -Every batch undergoes mechanical testing, including tensile, elongation, and shear strength verification.
- -Ensures high resistance to dynamic loads and vibrations from vehicles, wind, or water flow ideal for outdoor and bridge installations.
2. Hot Dip Galvanized Coating (HDG)
•HDG Coating Process
- -Each bolt and nut is processed through pickling, fluxing, and immersion in molten zinc at 450°C–460°C, ensuring a metallurgical bond between steel and zinc for lasting protection.
•Surface Properties of HDG Coating
- -Provides 5 - 10 times better rust protection than electro-galvanized coatings.
- -Perfect for outdoor, coastal, and high-humidity environments.
- -Coating thickness: ≥ 85 Microns (μm) per industrial standard.
- -Smooth surface, non-flaking, and impact-resistant.
•Quality Control & Inspection
- -Coating thickness measured with digital thickness gauges.
- -Visual inspection of surface and zinc adhesion performed for every production lot before delivery.
3. Custom Manufacturing (Made-to-Spec Capability)
•Full-size customization for bolts, nuts, and washers according to engineering drawings or project requirements, such as:
- -Thread sizes: M10, M12, M16, M20, M24, M27, M30
- -Lengths: 25–300 mm
•Supports metric (ISO) and coarse-thread (UNC) specifications.
•Custom head shapes available:
- -Slotted Round Head Bolt
- -Hex Head Bolt
- -Flat Head Bolt
•Optional company logo or part code engraving on bolt heads for project-specific traceability.
4. Quality Assurance System (QA/QC)
•Quality controlled at every stage—from raw materials to finished goods.
•Supplied with HDG Coating Certificates and Mechanical Test Reports.
•Stored in humidity-controlled warehouses to prevent corrosion before dispatch.
•Delivered with complete documentation, including :
- -Material Test Certificate (MTC)
- -Inspection & QA Report
- -Packing List and Delivery Note for project submission.
5. Application Areas
•PB-Trading HDG Bolts & Nuts are suitable for multiple infrastructure and structural uses :
- -Highway Guardrail Systems
- -Expressway & Tollway Structures
- -Lighting poles, CCTV poles, and traffic installations
- -Bridge, viaduct, and tunnel structures
- -Grounding and industrial electrical systems
Production Capacity & Warehouse Readiness
PB-Trading’s manufacturing facility and warehouse in Samut Sakhon are fully equipped with modern machinery, including
- •Automatic Thread Rolling Machines
- •Cold Forging Machines for bolt head forming
- •Industrial-grade zinc coating furnaces
- •HDG thickness gauges and tensile testing machines
Logistics & Distribution System
- •Automated inventory tracking system for stock control
- •Nationwide delivery via truck or express shipping
- •Palletized packing to prevent damage during transportation
After Sales & Technical Support
Our technical team provides full consultation and documentation support, including
- •Selecting appropriate bolt sizes and grades for each project
- •Load and shear calculations for structural applications
- •Maintenance advice for HDG-coated components to ensure long lifespan
- •Preparation of official quotations, spec sheets, and certification documents for both public and private tenders
Why PB-Trading is Trusted Nationwide?
Product Highlights
| Product Name | Description | Standard | Finish |
|---|---|---|---|
| Guardrail Bolt Set | Bolts, nuts, and washers for guardrail beam installation | Department of Highways (DOH) | HDG |
| Block Out | Steel spacer block between guardrail post and beam | EXAT Standard | HDG |
| Ground Rod + Exothermic Welding | Grounding system with OFC copper bonding | TIS / IEEE | HDG |
| Anchor Bolt / U-Bolt | For securing steel structures and poles | ISO 898 | HDG |
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