Duplex Fasteners Manufacturer & Supplier in Europe

Duplex Fasteners Manufacturer & Supplier in Europe - PipingProjects.eu

Duplex Fasteners Manufacturer and Supplier in Europe

PipingProjects.eu is one of the leading Duplex Fasteners Manufacturer in Europe. We supply many excellent fastening options for a broad range of industrial applications. With an emphasis on exact engineering and respect for international standards, our fasteners are designed to ensure secure and trustworthy connections in various industries, including manufacturing, energy, and construction. As a dependable Duplex Fasteners Supplier in Europe, we place a high value on quality, innovation, and timely delivery to meet the fastening needs of our clients throughout the European market.

What are Duplex Fasteners?

Duplex fasteners are hardware components made of stainless steel. Unlike typical stainless steel, duplex stainless steel has a dual-phase microstructure with ferritin and austenitic phases, giving it exceptional mechanical qualities and resistance to corrosion. Duplex fasteners are commonly used in industries requiring strong corrosion resistance and high strength, such as pulp and paper, chemical processing, oil and gas, and marine engineering.

They offer several benefits, such as resistance to stress corrosion, pitting, and crevice corrosion; increased strength that allows them to bear high loads, good weldability that makes complex fabrication easier; and long-term cost-effectiveness even with higher initial costs. Grades that combine corrosion resistance, mechanical strength, and economic viability, including Duplex 2205 and Super Duplex 2507, are widely used and essential for various applications.

Top leading Manufacturing Companies

What distinguishes us as the leading Duplex Fasteners Manufacturers in Europe?

As the top Duplex Fasteners Manufacturer in Europe, we take great satisfaction in providing high-calibre goods that satisfy the various demands of the continent's industries. We guarantee the fabrication of Duplex Fasteners that meet the most exact international requirements thanks to our sophisticated manufacturing techniques. We are positioned as a reliable source offering customized solutions because of our commitment to innovation, dependability, and customer satisfaction.

We are the best Duplex Fasteners Supplier in Europe because we never hesitate to commit to efficiency, quality, and customer-first methods. We place a high value on accuracy in our manufacturing procedures, guaranteeing that our goods meet and surpass industry requirements. We serve a wide range of industrial applications with our extensive selection of Duplex Fasteners. We make a name for ourselves as the preferred option for companies looking for long-lasting and practical solutions throughout Europe.

Piping Projects Europe
Duplex Fasteners Manufatcurer, Supplier and Dealer in Europe


Fastener Manufacturer in Europe
Fastener Supplier in Europe
Fastener Dealer in Europe

Duplex Fasteners - Specifications

  • Product : Duplex Fasteners
  • Thickness : 3 mm to 200 mm
  • Types of Duplex Fasteners : Nut, Bolt, Screw, Washer, Stud, Threaded Rod
  • Standard : DIN, ISO, JIS, GB, IS, BS, ASTM
  • Fasteners Thread Type: Metric, Metric Course, UNF, Metric Fine, BA, BSF, UNC, UN8, BSW.
  • Finishes : Self-Colour, Passivated, Bright Zinc Plated (BZP), Hot Dip Galvanised (HDG), Sherardized
Trusted Supplier


Genuine Product


Easy purchase


Duplex Fasteners Specification Chart

PipingProjects.eu is a trusted Duplex Fasteners Manufacturer in Europe, provides a large selection of fasteners in a range of specifications to fit different sizes and grades.

Duplex Fasteners Size & Specification
Fateners size Specifications
Duplex Fasteners Length 3 mm to 200 mm
Thickness 1 to 300mm
Size M3 to M56
Temperature Range -50-300 °C
Thread Types Metric, Metric course, UNF,Metric Fine, BA, BSF, UNC, UNB, BSW
Duplex D S31803, D S32205, SD S32750, SD S32760, SD S32950

Applications of Duplex Fasteners

  • Oil & Gas Industry Duplex fasteners are utilized in equipment exposed to corrosive and hostile environments, such as subsea pipelines and offshore drilling rigs. For these demanding applications, their strength and resistance to corrosion make them perfect.
  • Chemical Industry In chemical industries, where workers frequently come into contact with corrosive substances, duplex fasteners are used in reactors, pumps, valves, and other machinery. Their ability to withstand corrosion contributes to the durability and integrity of vital infrastructure.
  • Marine Duplex fasteners are used in shipbuilding, offshore platforms, and marine structures subjected to salt spray and seawater. They can tolerate marine settings because of their strength and resistance to corrosion.
  • Pulp & Paper Industry Duplex fasteners are used in paper machines, bleach plants, digesters, and other equipment in pulp and paper mills. They endure the high temperatures and pressures needed in manufacturing and resist corrosion from the chemicals used.
  • Renewable Energy In wind and tidal energy fields, duplex fasteners are becoming more and more common. They are utilized in foundations, turbines, and other harsh environment-exposed structures.
  • Construction & Infrastructure Duplex fasteners, which offer endurance and dependability, are utilized in bridges, tunnels, and architectural structures in building projects where corrosion from environmental exposure is a problem.

Duplex Fasteners Chemical Composition

Chemical Composition of Duplex Fasteners
Grade C Mn Si P S Cr Mo Ni N Fe
Duplex S31803 0.030 max 2.00 max 1.00 max 0.030 max 0.020 max 22.0 – 23.0 3.0 – 3.5 4.50 – 6.50 0.14 – 0.20 63.72 min
Duplex S32205 0.030 max 2.00 max 1.00 max 0.030 max 0.020 max 21.0 – 23.0 2.50 – 3.50 4.50 – 6.50 0.8 – 0.20 63.54 min
Duplex S32750 0.030 max 1.20 max 0.80 max 0.035 max 0.020 max 24.00 – 26.00 3.00 – 5.00 6.00 – 8.00 0.24 – 0.32 58.095 min
Duplex S32760 0.05 max 1.00 max 1.00 max 0.030 max 0.010 max 24.00 – 26.00 3.00 – 4.00 6.00 – 8.00 0.20 – 0.30 57.61 min

What are the key properties of duplex steel that make it suitable for fastening applications?

  • Duplex Steel is an excellent choice for fastening applications because of several essential characteristics. First, it offers a unique blend of mechanical strength and corrosion resistance due to its dual-phase microstructure, which consists of austenitic and ferritic phases.
  • Because of this, duplex stainless steel fasteners are corrosion-resistant and can be used in various industries, including chemical processing, oil and gas, and maritime engineering. Duplex Steel also ensures the long-term integrity of fixed structures, even under challenging circumstances, by providing exceptional resistance to localized corrosion phenomena, including pitting and crevice corrosion.
  • Duplex Steel also has outstanding weldability, making it simple to fabricate and install fasteners in various configurations. Achieving safe and dependable couplings in intricate assemblies and constructions requires this quality.
  • In addition, duplex stainless steel fasteners are frequently more affordable in the long run since they require less maintenance and have a longer service life than other materials. These characteristics make duplex stainless steel a desirable option for fastening applications where corrosion resistance, dependability, and longevity are critical considerations.

Duplex Fasteners Mechanical Properties

Mechanical Properties of Duplex Fasteners
Element Density (g/cm 3) Density (lb/in 3) Melting Point (°C) Melting Point (°F)
S31803 / S32205 7.805 0.285 1420 – 1465 2588 – 2669
S32750 / S32760 7.8 0.281 1350 2460

Are duplex fasteners suitable for use in high-temperature environments?

  • Duplex fasteners can be used in high-temperature situations, but how well they work will depend on the particular grade and operating environment. Duplex Steel typically has good mechanical and corrosion resistance qualities, but factors like alloy composition, heat treatment, and exposure time can affect how well it performs at high temperatures.
  • Duplex Steel comes in a few grades, including Duplex 2205 and Super Duplex 2507, intended to withstand moderate heat up to around 300–400°C (572–752°F) while maintaining its mechanical strength and corrosion resistance. However, prolonged exposure to temperatures over this range may cause a decrease in mechanical qualities and a rise in the vulnerability to specific kinds of corrosion. Consequently, it's critical to consider the intended operating temperature range while choosing duplex fasteners.
  • Additionally, considerations such as thermal cycling, expansion, and thermal fatigue should be made while using duplex fasteners in high-temperature situations. The long-term dependability of attached assemblies can be guaranteed using appropriate material selection and engineering design to reduce thermal stress impacts.
  • The best fastening solutions for high-temperature applications can be chosen by consulting materials engineers and following industry standards and guidelines when extreme temperatures or thermal fluctuations are expected. This will maximize performance and durability while lowering the risk of premature failure.

Equivalent Grades of Duplex Fasteners

Duplex Fasteners of Equivalent Grades
Duplex 2205 S31803 / S32205 1.4462

Various types of Duplex Fasteners We Supply

PipingProjects.eu is a trusted Duplex Fasteners Supplier in Europe. A selection of Duplex Steel Fasteners supplied by Piping Projects in Europe are shown here.

Size Chart of Duplex Fasteners

Duplex Fasteners Sizes
Fasteners Type
Socket Head Cap Fasteners
M1.6 to M64
B18.3.1 M
Socket Low Head Cap Fasteners
M4 to M20
Socket Head Shoulder Fasteners
M6 to M24
Countersunk Socket Head Fasteners
M3 to M20
Button Head Socket Fasteners
M3 to M12
Flange Button Head Socket Fasteners
M3 to M10
Knurled Point Socket Set Fasteners
M3 to M20
Flat Point Socket Set Fasteners
M6 to M12
Dog Point Socket Set Fasteners
M3 to M20
Cone Point Socket Set Fasteners
M3 to M12
Plain Point Socket Set Fasteners
M3 to M20
Taper Pressure Plug
M8 to M22

Dimension Chart of Duplex Fasteners

Duplex Fasteners Dimensions
Bolt Size USS SAE
OD (in.) ID (in.) Thickness OD (in.) ID (in.) Thickness
1/8 (#6) 0.375 0.156 .036/.065
5/32 (#8) 0.438 0.188 .036/.065
3/16 (#10) 0.560 0.250 .036/.065 0.500 0.220 .036/.065
7/32 (#12) 0.562 0.250 .051/.080
1/4 (#14) 0.734 0.312 .051/.080 0.625 0.281 .051/.080
5/16 0.875 0.375 .064/.104 0.688 0.344 .051/.080
3/8 1.000 0.438 .064/.104 0.812 0.406 .051/.080
7/16 1.250 0.500 .064/.104 0.922 0.469 .051/.080
1/2 1.375 0.562 .086/.132 1.062 0.531 .074/.121
9/16 1.469 0.625 .086/.132 1.156 0.594 .074/.121
5/8 1.750 0.688 .108/.160 1.312 0.656 .074/.121
3/4 2.000 0.812 .122/.177 1.469 0.812 .108/.160
7/8 2.250 0.938 .136/.192 1.750 0.938 .108/.160
1 2.500 1.062 .136/.192 2.000 1.062 .108/.160
1 1/8 2.750 1.250 .136/.192 2.250 1.250 .108/.160
1 1/4 3.000 1.375 .136/.192 2.500 1.375 .136/.192
1 3/8 3.250 1.500 .153/.213 2.750 1.500 .136/.213
1 1/2 3.500 1.625 .153/.213 3.000 1.625 .153/.213
1 5/8 3.750 1.750 .153/.213
1 3/4 4.000 1.875 .153/.213
1 7/8 4.250 2.000 .153/.213
2 4.500 2.125 .153/.213
2 1/4 4.750 2.375 .320/.248
2 1/2 5.000 2.625 .210/.280
2 3/4 5.250 2.875 .228/.410S
3 5.500 3.125 .249/.327

Torque Chart of Duplex Bolt Fasteners

Duplex Bolt Fasteners Torque
Nominal Diameter (inch) Torque ft-lb (Lubricated) Threads (inch) Torque ft-lb (Dry)
1/4″ 4.8 20 6.5
5.5 28 7.4
5/16″ 10 18 13.2
11 24 14.7
3/8″ 17.7 16 23.5
19.9 24 26.6
7/16″ 28.2 16 37.6
31.5 24 42
1/2″ 43.0 13 57.4
48.5 20 64.7
9/16″ 62.1 12 82.7
69.2 18 92.3
5/8″ 85.7 11 114.2
97 18 129.3
3/4″ 152 10 203
170 16 226
7/8″ 245 9 326
270 14 361
1″ 368 8 490
412 14 549
1-1/4″ 639 7 853
708 12 944
1-1/2″ 639 6 1484
1252 12 1669

Most Common Uses for Duplex Fasteners

  • Duplex Fasteners Used in Construction
  • Duplex Fasteners Used in Automotive Trim
  • Duplex Fasteners Used in Stamped Machined Products
  • Duplex Fasteners Used in Cookware
  • Duplex Fasteners Used in Appliances
  • Duplex Fasteners Used in Kitchen
  • Duplex Fasteners Used in Sinks
  • Duplex Fasteners Used in Railway Cars
  • Duplex Fasteners Used in Foodservice Equipment
  • Duplex Fasteners Used in Trailers
Construction Steel Industry Architecture Food Industry Industrial Products

Duplex Fasteners Manufacturer & Supplier in Europe

Duplex Fasteners Manufacturer in Europe

Duplex Fasteners Manufacturer in Europe

Duplex Fasteners Supplier in Europe

Duplex Fasteners Supplier in Europe

Piping Projects Europe

Get In Touch

Security Question -
What is 4 + 2 ?


Contact Us

Countries We Supply Steel Plate

Countries We Supply Steel Tube

Countries We Supply Fasteners

Countries We Supply Steel Pipe

Countries We Supply Round Bar

Countries We Supply Pipe Fittings

Countries We Supply Flanges

Countries We Supply Valves

Countries We Supply Gaskets

Cities We Supply Steel Plate in Turkey

Cities We Supply Steel Tube in Turkey

An online directory and B2B Marketplace developed by Pipingprojects.eu to connect buyers and suppliers of construction material and products from Europe, Albania, Austria, Belgium, Iceland, Ireland, Hungary, Luxembourg, Malta, Romania, Portugal, Norway, Switzerland and others. A perfect platform where you get the best price of industrial steel, metal and alloys from verified manufacturers, traders, genuine stockists, exporters and importers in Europe.