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Lina Fasteners is a reliable manufacturer and supplier based in Tunis, Tunisia, offering high-performance Super Duplex Steel stud bolts for demanding industrial applications. Known for their exceptional strength and superior resistance to corrosion, these stud bolts are designed to perform in extreme environments such as offshore, marine, oil and gas, and chemical processing industries. At Lina Fasteners, quality, precision, and durability are at the core of every product. With modern manufacturing facilities and a skilled technical team, the company ensures consistent standards, timely delivery, and customized solutions that meet international specifications and customer expectations worldwide.
Super Duplex Steel Stud Bolts are manufactured from a high-alloy stainless steel containing a balanced mix of chromium (around 25%), nickel, molybdenum, and nitrogen. This unique composition creates a dual austenitic–ferritic structure that delivers exceptional strength and corrosion resistance. Mechanically, these stud bolts offer very high tensile and yield strength, excellent fatigue resistance, and superior performance under high pressure and temperature conditions. They also provide outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking.
| 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 stud bolts are chosen when strength and reliability really matter. They are commonly used in oil and gas plants, offshore platforms, marine equipment, and chemical processing units where harsh environments are the norm. These stud bolts perform extremely well in salty, acidic, and high-pressure conditions without losing their integrity. Engineers trust them for pipelines, pressure vessels, heat exchangers, and flanged connections. Their long service life and low maintenance make them a cost-effective and dependable solution for critical industrial applications.
At Lina Fasteners, we make sure that our Super Duplex Steel stud bolts are packed in the most appropriate manner. Every stud bolt is covered with protective materials to avoid scratching, rusting, and contamination of the bolt during transportation. We use durable cartons and provide custom packaging to suit your needs and preferences in the best way possible. Clear labeling and packing also help in identification and handling of the products, which is a proof of our high 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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