Repute Steel & Engineering Company is a trusted manufacturer and supplier of high-quality Duplex and Super Duplex fasteners, offering a complete range of reliable fastening solutions for diverse industrial applications. From bolts and nuts to washers and screws, we provide durable products tailored to meet the specific needs of industries worldwide, delivering exceptional performance and reliability.
Duplex and Super Duplex fasteners from Repute Steel & Engineering Company are ideal for environments requiring superior corrosion resistance, such as marine industries, offshore drilling rigs, oil and gas pipelines, desalination plants, and chemical processing facilities. These fasteners combine excellent durability with high strength, ensuring long-lasting performance in challenging and demanding applications.
Our Duplex and Super Duplex fasteners are rigorously tested to meet stringent quality standards. We perform micro and macro structural integrity tests, flaring and pitting resistance evaluations, PMI testing for material identification, and 100 percent radiography testing to detect defects. With a strong commitment to precision engineering and quality assurance, Repute Steel & Engineering Company continues to deliver fastening solutions that exceed expectations across various industries.
Standard Specification For Duplex & Super duplex Fasteners
| Specifications | ASTM F467 / ASME SF467 |
| Fasteners size | Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes Washers Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes Machine Screws Size : M1.6 – M12 Self Tapping Screw Size : No.2 – No. 14 |
| Fasteners Length | 3 mm to 200 mm |
| Fastener Threads | UNF, BSW, BSF, METRIC, UNC or as required |
| Standard of Stainless Steel Fasteners | DIN : DIN 934, DIN 931, DIN 970, DIN 933 UTS : UNEF, NPT, UNC, UNS, UNF, NPTF ISO : JIS standards, ISO 4033, ISO 4032, ANSI – American National Standards Institute ASME B18.5 ANSI B 28.2.4 1M as per defined in ASME B16.5 standard SS Stud Bolt length ANSI B 18.2.4 2M as per defined in ASME B18.2.2 SS Hex nuts |
| Dimensions | DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
| Surface Coating | Ptfe Coated Stainless Steel Fasteners Phosphate Coating Teflon Coating Zinc Coating Hot Dipped Galvanizing Coating Cadmium Coating Xylon Coating |
| Fasteners Finishing | Stainless steel : Self-Colour, Passivated, Bright Zinc Plated (BZP), Hot Dip
Galvanised (HDG), Stainless Steel, Sherardized, some special one like
DACROMET Geometry and Mechanically Applied coating ,Dacroment, nickel
plated, anodizing, plated zinc-nickel Zinc (blue, black, yellow, white), black oxide. |
Common Applications of Duplex & Super Duplex Fasteners
- 1. Oil and Gas Industry: Provides excellent corrosion resistance in both offshore and onshore installations.
- 2. Chemical and Petrochemical Plants: Ideal for equipment exposed to harsh chemicals and corrosive environments.
- 3. Marine Industry: Highly resistant to seawater corrosion, ensuring long-term durability in marine conditions.
- 4. Construction and Infrastructure: Applied in structural connections, bridges, and heavy-duty machinery.
- 5. Power Generation Plants: Can withstand high-temperature and mechanical stresses in power plants.