Duplex Stainless Steel Hex Bolt
A duplex stainless steel hex bolt is a high-performance fastener engineered for strength, corrosion resistance, and durability, especially in demanding industrial environments. These bolts are made from duplex stainless steel, an alloy known for its dual-phase microstructure that combines the strength of ferritic steel with the corrosion resistance of austenitic steel. The hex head provides ease of installation using standard tools, making these bolts a go-to choice across multiple sectors, from marine to petrochemical.
At Flybear Fastener, we specialize in manufacturing top-quality duplex stainless steel hex bolts that meet global standards and provide unmatched performance under the most challenging conditions.
Product Overview
Duplex stainless steel hex bolts are used when superior tensile strength and corrosion resistance are required. These bolts are often preferred in applications involving aggressive chemical environments, high salinity, pressure systems, and offshore structures. They are known for exceptional resistance to stress corrosion cracking and pitting, especially in chloride-rich environments.
Product Specification Table
| Parameter | Specification |
|---|---|
| Product Name | Duplex Stainless Steel Hex Bolt |
| Standard | DIN 933, ISO 4017, ANSI B18.2.1 |
| Size Range | M3 – M64 |
| Thread Type | Full or Partial |
| Grade | S31803, S32205, 2205 Duplex |
| Head Style | Hexagon |
| Finish | Plain, Black Oxide |
Technical Parameters
| Property | Value |
|---|---|
| Yield Strength | ≥ 450 MPa |
| Tensile Strength | ≥ 620 MPa |
| Elongation | ≥ 25% |
| Hardness | 25 HRC ± 2 |
| Temperature Tolerance | -50°C to 300°C |
| Corrosion Resistance | Excellent (especially in seawater) |
Material Grade and Production Process
Duplex stainless steels such as UNS S31803 and S32205 are used for high-strength and anti-corrosion performance. These alloys combine ferritic and austenitic phases, which result in exceptional resistance to corrosion and high mechanical strength, surpassing that of standard austenitic stainless steels like 304 or 316.
Production Workflow Includes:
- Material selection and quality verification
- CNC cold forging and threading
- Heat treatment and stress relieving
- Surface treatment (passivation, zinc plating, hot dip galvanization)
- Quality inspection and packing
Applications and Industries
Duplex stainless steel hex bolts are used in:
- Offshore drilling rigs and marine construction
- Chemical processing and desalination plants
- Pulp and paper industry
- Petrochemical refineries
- Construction infrastructure requiring high corrosion resistance
These bolts excel in extreme environments where other fasteners may fail due to corrosion, such as saltwater exposure or high-pressure pipelines.
Product Benefits and Competitive Advantages
Material Excellence
Flybear Fastener uses premium-grade duplex stainless steel certified for mechanical and chemical composition conformity. The alloy offers high strength with minimum elongation—ideal for structural integrity.
Precision Machining
All our bolts are crafted with high-precision machining, ensuring tight thread tolerance and compatibility with global standards.
Advanced Surface Coating
Our surface treatments add an extra layer of protection, particularly against oxidation, rust, and chemical attacks—a must for marine and coastal environments.
Strong Customization Capabilities
We support OEM and custom fabrication tailored from client drawings or samples. Whether it’s a unique thread, unusual dimensions, or special coating need, we deliver fast and accurately.
Rapid Dispatch and Inventory
With ready stock in many configurations and a robust production lead time, we ensure minimal downtime with fast deliveries.
Comprehensive After-Sales and Technical Support
Our technical team provides complete guidance, from pre-sale consultation to after-sale troubleshooting, servicing global industries with prompt responses.
Testing and Quality Control
To ensure every bolt meets international standards, Flybear Fastener employs a rigorous quality control protocol:
- PMI (Positive Material Identification)
- Dimensional analysis and thread go/no-go testing
- Salt-spray corrosion testing
- Mechanical strength and load capacity verification
- Certificate of Conformity (CoC), Material Test Reports (MTR) available upon request
Selection Guide and Purchasing Tips
When selecting Duplex Stainless Steel Hex Bolts, consider the application environment, load requirements, thread type, and surface coating. For high-corrosion locations like seawater or chemical processing, options like S32205 and hot-dip galvanizing are ideal. For structural applications, check compatible sizes and thread engagement requirements.
Evaluate the required mechanical strength and compliance with global standards such as ASTM, DIN, or ISO. Don’t forget to discuss custom specifications and bulk pricing with our technical team.
Conclusion and Company Introduction
With continued advancements in materials and engineering, duplex stainless steel hex bolts represent the future of high-performance fastening solutions. Choosing Flybear Fastener guarantees products that are competitively priced, precision-engineered, and backed by dependable technical support.
We always adhere to the principle of “quality first, customer supreme” and are committed to providing our customers with high-quality fastener products and one-stop fastening solutions. Visit our product page or simply contact us to get a quote or detailed information on how our fasteners can benefit your industry.
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