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Lina Fasteners, located in Tunis, Tunisia, is a trusted manufacturer and supplier of high-quality Super Duplex Steel Nuts designed for demanding industrial environments. With a strong focus on precision manufacturing and strict quality control, the company delivers fastening solutions that offer exceptional strength, corrosion resistance, and long service life. Super Duplex Steel Nuts from Lina Fasteners are engineered to perform reliably under high pressure and in aggressive conditions. By meeting international standards and customer specifications, Lina Fasteners continues to support industries such as offshore, marine, chemical processing, and oil and gas with dependable and durable fastening components.
Super Duplex Steel Nuts are manufactured from a high-alloy stainless steel with a balanced austenitic and ferritic structure. The composition typically includes high levels of chromium, nickel, and molybdenum, along with nitrogen to enhance corrosion resistance and strength. This structure provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. Mechanically, Super Duplex Steel Nuts offer very high tensile and yield strength, excellent fatigue resistance, and good impact toughness. They maintain mechanical stability under extreme temperatures and high-pressure conditions, making them ideal for critical industrial applications.
| Standard | DIN, ASTM, BS and all International Standards |
| Specifications | ASTM A479 & ASME SA479 |
| UNS S32760 Nut and Bolts Size | M3 To M56 3/6″ to 2″ |
| Length | 3 to 200 MM |
| Super Duplex Steel 2207 Machine Screws Size | M1.6 To M12 |
| Duplex Steel 2205 Washers Size | M3 To M56 3/6″ to 2″ |
| Tensile Strength(MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) | Hardness Rockwell C (HR C) | |
| Super Duplex Steel Bolts | 760 | 550 | 15 | 32 Max |
| Phosphorus | Sulphur | Silicon | Carbon | Manganese | Nickel | Molybdenum | Nitrogen | Copper | Chromium |
|---|---|---|---|---|---|---|---|---|---|
| 0.035 % max | 0.02 % max | 0.80 % max | 0.03% Max | 1.20 % max | 6.00 – 8.00 % | 3.00 – 5.00 % | 0.24 – 0.32 % | 0.50 % max | 24.0 – 26.0 % |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
Super Duplex Steel Nuts are widely used in industries that operate in harsh and corrosive environments requiring high-strength fastening solutions. They are commonly applied in offshore oil and gas platforms, subsea pipelines, and marine structures exposed to seawater and chlorides. In chemical and petrochemical processing plants, these nuts are used in pumps, valves, pressure vessels, and heat exchangers. They are also suitable for desalination plants, power generation systems, and heavy industrial equipment where long-term durability is essential. Super Duplex Steel Nuts ensure secure fastening performance, making them a preferred choice for critical applications in demanding conditions.
At Lina Fasteners, we make sure that our Super Duplex Steel nuts are packed in a very special manner. Every nut is packed separately in protective materials to avoid any impact such as mechanical, chemical or microbial on the nuts during transportation. Our cartons are made of durable material and we provide customized packaging services for your products. Proper labeling and packing also help in identification and handling of the products, thus showing our seriousness in providing quality products in good condition.
Lina Fasteners is a leading manufacturer and supplier of high-quality fasteners in Tunis, Tunisia, with over 8 years of experience serving global industries.
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