Haihao Group Delivers Hot-Dip Galvanized Bolt & Nut Assemblies to Singapore

Haihao Group has successfully completed the delivery of a full range of hot-dip galvanized bolt and nut assemblies for a customer in Singapore. The shipment covered multiple specifications of metric high-strength fasteners, designed for demanding pipeline and infrastructure applications where mechanical reliability and corrosion protection are essential.

All assemblies were manufactured and inspected in strict accordance with ASTM and ISO standards, ensuring consistent quality, long service life, and safe installation in outdoor and industrial environments.

Supplied Bolt & Nut Assemblies

The delivered products mainly consist of complete fastening sets, including:

• Hex bolts
• Airtight self-locking nuts
• Double flat washers
• Spacers (pipe-cut type, where required)

Typical Specifications

• Sizes: M16 × 75, M16 × 80, M20 × 100, M24 × 120 / 240, M30 × 130, M42 × 320 / 390, M60 × 490 / 520
• Bolt material: ASTM F568M Class 8.8
• Nut material: ASTM A563M Class 8
• Surface treatment: Hot-Dip Galvanized
• Galvanizing standard: ISO 1461 or ASTM A153

These high-strength galvanized bolt and nut assemblies are supplied as complete sets to ensure compatibility, ease of installation, and reliable preload performance.

Hot dip galvanized high strength bolt and nut assemblies supplied by Haihao Group for pipeline projects

Hot-Dip Galvanization for Long-Term Protection

All fasteners were treated with hot-dip galvanization, providing a thick and durable zinc coating that offers:

• Excellent corrosion resistance in humid and coastal environments
• Extended service life for outdoor pipeline systems
• Strong adhesion and uniform coating thickness
• Compliance with ISO 1461 and ASTM A153 requirements

This surface treatment is especially suitable for pipeline supports, flanged joints, and structural connections exposed to aggressive conditions.

Applications

The supplied ASTM F568M Class 8.8 bolt and nut assemblies are widely used in:

• Pipeline installation and support systems
• Oil & gas facilities
• Power plants and energy projects
• Industrial steel structures
• Infrastructure and utility construction

Quality Control and Traceability

Haihao Group applies strict quality management throughout the production process, including:

• Raw material verification for bolts and nuts
• Mechanical property testing for Class 8.8 fasteners
• Dimensional inspection
• Galvanizing thickness inspection
• Complete documentation and traceability

Each shipment is delivered with consistent quality, meeting project-specific technical requirements.

Haihao Group – Reliable Supplier of Pipeline Fasteners

As an experienced manufacturer and exporter, Haihao Group supplies pipe fittings, flanges, pipes, and industrial fasteners to global markets including Southeast Asia, the Middle East, Europe, and CIS regions.

With strong engineering support and stable production capacity, we provide customized fastening solutions for international pipeline and infrastructure projects.