Duplex 2205 Screws
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Duplex Screws manufactured by Sunmach are designed to deliver exceptional strength, corrosion resistance, and long-term reliability for demanding industrial applications. With over 13 years of manufacturing experience, we produce a complete range of Duplex 2205 Screws, including hex head cap screws, socket head cap screws, hex socket set screws, countersunk screws, button head screws, truss head screws, and custom-engineered fasteners. Our screws are widely used across offshore oil & gas, desalination, chemical processing, petrochemical, power generation, marine, aerospace, semiconductor, pharmaceutical, and heavy engineering industries where high mechanical performance and resistance to seawater, chlorides, and aggressive chemicals are essential. Manufactured in our ISO 9001:2015 certified facility, Duplex Screws are produced using advanced cold-forming, precision thread rolling, CNC machining, and solution annealing processes to ensure superior dimensional accuracy and mechanical integrity. Every screw is manufactured from certified Duplex 2205 raw material sourced from globally recognized mills, undergoes comprehensive quality testing, and is backed by 100% material traceability and a Certificate of Conformance (CoC). With rapid production capability, custom manufacturing solutions, and reliable exports across the GCC, Europe, Southeast Asia, and North America, Sunmach is a trusted global manufacturer and supplier of high-performance Duplex 2205 Screws for critical industrial applications.
Duplex 2205 (S31803) Screws
Sunmach is an ISO 9001:2015 certified manufacturer and global supplier of standard Duplex 2205 Screws, Hex Head Cap Screws, Socket Head Cap Screws, Hex Socket Set Screws, Flat Countersunk Head Cap Screws, Button Head Cap Screws, Slotted Truss Head Machine Screws, & custom or Special Duplex 2205 Screws. Apart from Duplex Screws, We also manufacture Screws from these other special materials such as Super Duplex, Hastelloy® C-276, Hastelloy® C-22, Hastelloy® B-2, Hastelloy® G-30, Inconel® 600, Inconel® 625, Inconel® 718, Stainless Steel 300 Series, Nickel 200, Titanium Grade 2, Titanium Grade 5, Titanium Grade 7 & Monel® 400, Monel® K-500, Special Stainless 904L, Nitronic® 60, 254 SMO, A4-80 Stainless Steel to name few.
To manufacture & timely deliver a precision Standard Duplex 2205 Screws or Custom Duplex 2205 Screws, apart from adequate inventory, we have advanced machinery, experienced engineering team, R&D; team, Prototyping team, Heat Treatment facility & all required Testing along with the efficient logistic team. All Raw Materials sourced from the most reputable and renowned manufacturers in the world.
Sunmach bolts meet applicable DIN, ISO, ANSI and IS.
Sunmach serves a diverse range of markets including Chemical Processing, Semiconductor, Power Generation, Aerospace, Oil & Gas, Pharmaceutical, Food & Beverage, Marine, Pulp & Paper, Petrochemical & Refining, Air Pollution Control and Water Treatment.
Frequently Asked Questions
Common questions about Sunmach Duplex Screws
They are used for critical fastening in high-vibration, high-load, and severely corrosive environments. Typical applications include offshore oil platforms, subsea equipment, seawater desalination piping, chemical reactor tanks, and marine propulsion components. Utilizing Duplex 2205 ensures these bolted joints do not corrode, crack, or loosen over a 20-to-30-year operational life.
Standard 316L stainless steel has lower mechanical strength and is highly vulnerable to stress corrosion cracking (SCC) and crevice corrosion under bolt heads in warm, saltwater environments. Duplex 2205 screws provide twice the yield strength and outstanding resistance to pitting and SCC, allowing engineers to safely downsize fastener sizes while improving safety margins.
We manufacture standard and custom designs, including Hex Head Cap Screws (for general high-load distribution), Socket Head Cap Screws (for confined spaces requiring a flush or low profile), Hex Socket Set Screws (for locking shafts), Flat Countersunk Screws (for flat surfaces), and Button or Truss Head Screws (for wider bearing profiles).
Yes. Duplex 2205 screws maintain high mechanical strength across thermal cycling and resist vibration loosening. However, for applications continuously exceeding 250°C, alternative high-temperature stabilized stainless steel grades (like SS 347H) or superalloys (like Inconel 718) should be specified to avoid metallurgical embrittlement.
Every premium batch is dispatched with complete material traceability documentation. This includes EN 10204 3.1 Mill Test Certificates (MTC) showing the raw material's heat chemistry, physical tensile test results, Rockwell hardness measurements, and dimensional inspection logs proving complete compliance with customer engineering drawings.