Haihao Group Supplies Hot-Dip Galvanized Bolting Sets for Singapore Pipeline Project
Haihao Group has successfully completed the delivery of hot-dip galvanized bolting assemblies for a pipeline project in Singapore. The shipment consists of complete fastening sets, each including hex bolts, airtight self-locking nuts, and flat washers, manufactured in accordance with international ASTM and ISO standards.
These bolting sets are designed for secure flange connections in pipeline systems, where corrosion resistance, mechanical strength, and long-term sealing reliability are critical.
Hot dip galvanized bolt, nut and washer assemblies supplied by Haihao Group for Singapore pipeline project
Product Configuration and Sizes
Each supplied assembly includes:
- Hex Bolt
- 1 Airtight Self-Locking Nut
- 2 Flat Washers
The bolting sets were delivered in multiple metric sizes to match different flange dimensions and load requirements, including:
- M12 × 70
- M16 × 60
- M16 × 70
- M20 × 70
- M20 × 90
- M24 × 90
- M42 × 130
This wide size range ensures compatibility with various pipeline flange connections used in industrial and infrastructure projects.
Materials and Standards
All fasteners were produced using high-strength carbon steel materials, suitable for demanding pipeline environments:
- Bolt Material: ASTM F568M Class 8.8
- Nut Material: ASTM A563M Class 8
- Surface Treatment: Hot-dip galvanized
- Galvanizing Standards: ISO 1461 or ASTM A153
The Class 8.8 mechanical properties provide reliable tensile strength, while hot-dip galvanizing delivers excellent corrosion protection, making these bolting assemblies suitable for outdoor and humid operating conditions commonly found in Southeast Asia.
Application in Pipeline Systems
These hot-dip galvanized bolt and nut assemblies are widely used for:
- Pipeline flange connections
- Oil and gas transmission systems
- Industrial piping networks
- Water and utility pipeline projects
The inclusion of airtight self-locking nuts enhances vibration resistance and helps maintain joint integrity over long service periods.
Quality Control and Delivery
Each batch supplied by Haihao Group underwent strict quality control, including:
- Dimensional inspection
- Material grade verification
- Galvanized coating thickness checks
- Visual inspection before packing
Careful packaging ensured that all components arrived in good condition and were ready for installation upon delivery to the Singapore project site.
Reliable Supplier of Pipeline Fasteners
With extensive experience supplying ASTM F568M Class 8.8 bolts and ASTM A563M nuts for international pipeline projects, Haihao Group continues to support customers with stable quality, flexible specifications, and timely delivery.
Our bolting solutions are trusted by customers across oil & gas, petrochemical, power, and infrastructure projects, where secure and durable pipeline connections are essential.