Flange bolts and nuts are essential fasteners designed for connecting flanges, valves, pipes and pressure equipment. They are widely used in petrochemical, oil & gas, water supply, power plant, marine and construction projects. Our bolts and nuts comply with international standards, with uniform hardness, excellent tensile strength and anti-loosening performance to ensure safe and stable flange connection.
Production Details
Each batch of flange bolts and nuts is produced under strict quality control:
Raw material inspection and spectral analysis
Cold forging or hot forging forming
Precision threading and heat treatment
Hardness and tensile strength testing
Surface coating and anti-corrosion treatment
100% dimensional and visual inspection
Full batch traceability and marking
Product Feature and Application
Key Features
- High tensile strength and good toughness
- Precise thread for easy installation
- Good anti-corrosion and anti-rust performance
- Stable clamping force and anti-loosening
- Complete specifications and full matching
- Suitable for high-pressure and high temperature conditions
- Long service life in harsh environments
Typical Applications
- Flange connection in piping systems
- Valve, pump and pressure equipment assembly
- Oil & gas, petrochemical and refinery plants
- Water supply, heating and utility pipelines
- Power plant boiler and steam systems
- Marine, offshore and shipbuilding engineering
- Construction and industrial machinery
| Product Name | Flange Bolts and Nuts |
| Type | Hex bolt, heavy hex bolt, fully threaded bolt, stud bolt, hex nut, heavy hex nut |
| Standard | ANSI/ASME B18.2.1, B18.2.2, DIN 931/933/934, ISO 4032/4033, GB, JIS |
| Size | M6 – M100; 1/4″ – 4″ |
| Length | Custom as per flange thickness |
|
Grade |
Carbon steel: 4.8, 5.8, 6.8, 8.8, 10.9 Alloy steel: A193 B7, B16; A194 2H, 4, 7, 8 Stainless steel: A2-70, A4-70, A4 80, 304, 316 |
| Finish | Black oxide, hot dip galvanized, electro galvanized, plain, passivated |
| Certification | EN 10204 3.1, MTC, ISO 9001 |
Production Display
Our factory is equipped with automatic forging machines, thread rolling machines, heat treatment lines and professional testing equipment. We provide complete quality records and support third party inspection by SGS, BV, TÜV.
Product Transport Package
- Surface: Anti-rust oil, passivation, galvanized, black oxide
- Packaging: Carton box, plywood box, steel pallet
- Label: Size, grade, material, quantity, batch number
- Documents: Packing list, MTC, test report, certificate
- Transportation: Sea, land, air and global delivery
After-sales Service
- Professional size and grade consultation
- Custom length and special material supply
- Fast delivery and stable stock
- Timely after-sales response
- Quality assurance and batch replacement
- Long-term cooperative supply
Why Choose Us
- Complete flange fastener product range
- High-strength standard & custom bolts & nuts
- Strict quality control and full testing
- Large stock for fast delivery
- Competitive factory direct price
- Professional service for global projects
Contact us for flange bolts and nuts quotation and matching solutions.
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