AISI & Duplex Fasteners
Overview
AISI (American Iron and Steel Institute) and Duplex stainless steel fasteners represent the pinnacle of corrosion-resistant fastening solutions. These premium fasteners are engineered for the most demanding industrial applications where standard stainless steel simply isn't sufficient.
Our duplex fasteners combine the best properties of austenitic and ferritic stainless steels, offering superior strength, excellent corrosion resistance, and exceptional durability in harsh environments.
Material Grades
- AISI 304 / 304L
- AISI 316 / 316L
- Duplex 2205 (S32205)
- Super Duplex 2507 (S32750)
- Duplex 2304 (S32304)
Key Benefits
- 2x strength of 316 stainless
- Superior chloride resistance
- Excellent stress corrosion cracking resistance
- High pitting resistance equivalent (PREN)
- Cost-effective long-term solution
Technical Specifications
Popular Products
Duplex 2205 Hex Bolt
High-strength hex head bolts for offshore platforms, chemical processing plants, and marine applications. Available in full thread and partial thread configurations.
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Super Duplex 2507 Nut
Premium heavy hex nuts engineered for extreme environments. Ideal for oil & gas industry, desalination plants, and high-pressure systems.
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Duplex Stud Bolt
Continuous thread and double-end stud bolts for flange connections. ASME B16.5 compliant with excellent torque retention properties.
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Duplex Flat Washer
Precision-engineered washers for load distribution. Prevents galling and seizing in high-temperature applications up to 300°C.
View DetailsApplications
| Industry | Application | Recommended Grade |
|---|---|---|
| Oil & Gas | Offshore platforms, subsea equipment | Super Duplex 2507 |
| Chemical Processing | Heat exchangers, pressure vessels | Duplex 2205 |
| Marine | Shipbuilding, port infrastructure | Duplex 2205 / 316L |
| Desalination | Reverse osmosis systems | Super Duplex 2507 |
| Pulp & Paper | Digester systems, bleaching equipment | Duplex 2205 |
Quality Assurance
All our AISI and Duplex fasteners undergo rigorous testing including:
- Spectrometric chemical analysis
- Mechanical property testing (tensile, hardness, impact)
- Corrosion testing (salt spray, pitting resistance)
- Dimensional inspection per ASME/ISO standards
- Positive Material Identification (PMI)
- Ultrasonic and dye penetrant testing