Duplex steel fasteners
Benefits of Using Duplex Stainless Steel Fasteners
Duplex steel fasteners made of SS are extremely resistant to corrosion and are best for use in aggressive environments such as marine applications. They exhibit superior resistance to pitting, crevice corrosion, and stress corrosion cracking as compared to standard SS.
DSS fasteners are less prone to SCC compared to austenitic stainless steels which makes them advantageous in critical applications. These steel fasteners are often more cost-effective as compared to high-nickel content alloys or superalloys.
Reliable Supplier of Duplex Hex Bolts in Mumbai

Applications of Duplex Steel Bolts in Oil & Gas Industry
We are duplex hex bolt supplier in India, our DSS bolts are extensively employed in subsea equipment including subsea pipelines, risers, and manifolds. These bolts are utilized in offshore platforms for connecting structural components, securing equipment, and providing fastenings in critical areas. DSS bolts are also commonly employed in flanges and connectors which are vital for joining pipelines and equipment in the oil and gas industry.
DuplexPipeline – Leading Duplex Fastener Manufacturer in Mumbai – View Sizes & Specifications Online
Duplex stainless steel bolts
DSS friction grip bolts
Duplex threaded rod
Quality Assurance Measures for Duplex Hex Bolts
To ensure the utmost quality and reliability of DSS hex bolts, several measures can be undertaken throughout the bolt manufacturing process. Verify that the materials bought from the DSS fasteners manufacturer in India meet the exact specifications for the particular project or application
Implement strict quality measure controls during the entire manufacturing process of DSS bolts and nuts. Perform different tests and inspections to assess and ensure the highest quality of the manufactured hex bolts as per the required project specifications.
Duplex bolt, made of duplex stainless steel ranging in size from M6 to M100. the material has a high melting point of 1 350 °C.
Specification of duplex steel fasteners

We are duplex fasteners manufacturers in India, we provide high quality products
Order Duplex Screws at Factory Prices from Duplex Pipeline India
Types of duplex fasteners
Duplex hex bolts
- Size: M1.6 to M12
- Applications: petrochemical
- Machinery assemblies
DSS bolts and nuts
- Size: M3 – M56
- Length: 3 mm to 200 mm
Duplex steel screws
- Size: M3 – M56
- Thermal Conductivity: 19 at 100 °C
- saltwater
Duplex Threaded Rods – High Yield Strength & Material Specifications
Chemical composition of Duplex screws

Mechanical properties of DSS bolts

Performance of Duplex Friction Grip Bolts in Extreme Conditions
Creep is the tendency of a DSS material to deform under long-term exposure to high temperatures and constant stress. DSS friction grip bolts exhibit good creep resistance, allowing them to maintain their dimensional stability and structural integrity.
These grip bolts offer excellent corrosion resistance in high-pressure environments where corrosive substances or aggressive media are present. These DS bolts can sturdily withstand repeated stress cycles without premature failure or deformation, ensuring long-term reliability and safety.
What are the different coatings and finishes available for duplex bolts and nuts?
Zinc coating, commonly applied through processes like hot-dip galvanizing or zinc electroplating, provides excellent corrosion resistance to DSS nuts. Xylan is a fluoropolymer coating for bolts renowned for its low friction, wear resistance, and chemical resistance properties.
Yield Strength Range for Duplex Threaded Rods
The minimum yield strength for the DSS threaded rod typically falls within the range of 450 MPa (65 ksi) to 550 MPa (80 ksi) for DSS 2205. And as for SDSS rod 2507, it falls between 550 MPa (80 ksi) to 620 MPa (90 ksi). The maximum yield strength for DSS threaded rods can reach up to 700 MPa (100 ksi) or higher
Our products
- Duplex pipe
- Duplex tube
- Super duplex pipe
- Super duplex tube
- Duplex heat exchanger tubes
- Super duplex heat exchanger tubes
- Duplex plate
- Super duplex plate
- Duplex pipe fittings
- Super duplex pipe fittings
- Duplex steel flanges
- Super duplex flanges
- Duplex round bar
- Super duplex round bar
- Duplex steel fasteners
- Duplex 2205 pipe
- Super duplex 2507 pipe
- Super duplex 2507 flanges
- ASTM A789 UNS S31803 seamless tube
- ASTM A790 UNS S31803 seamless pipe
- UNS S31803 concentric reducers
- UNS S31803 elbow
- UNS S31803 tee
- UNS S31803 end cap
- UNS S31803 slip on flange
- UNS S31803 socket weld flange
- UNS S31803 lap joint flange

