SMO 254 fasteners are tough, corrosion-resistant components designed to thrive in the most challenging industrial settings. Made from SMO 254 (UNS S31254), a super-austenitic stainless steel alloy, these fasteners boast impressive resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in environments rich in chlorides and acids. Thanks to the alloy’s high molybdenum content (around 6%) and nitrogen, they offer enhanced durability and mechanical strength, making them a go-to choice over standard stainless steels like 304 or 316L in demanding situations.
These fasteners—ranging from bolts and nuts to washers, studs, and screws—showcase remarkable tensile and yield strength, outstanding fatigue resistance, and reliable performance even under high temperatures and mechanical stress. Their exceptional corrosion resistance makes them perfect for applications where reliability and safety are paramount, especially in systems that face seawater, chemical agents, or high humidity. Plus, they’re known for their great weldability and machinability, which means they’re easy to install and have a long service life, even in complex setups.
Standard : DIN, ASTM, BS and all International Standards
Size : 3 mm to 200 mm
Bolt / Screw Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Nuts Size : M3 – M56 | 3/6″ to 2″ | Custom Sizes
Washers Size : M1 – M64 | #4 to 3″ | Custom Sizes
Length : M02 to M33
| Grade | C | Mn | Si | S | Cu | Ni | Cr | N | Mo | P |
| SMO 254 | 0.02 max | 1 max | 0.8 max | 0.01 max | 0.5 – 1 | 17.5 – 18.5 | 19.5 – 20.5 | 0.18 – 0.22 | 6 – 6.5 | 0.03 max |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| SMO 254 | 8.0 g/cm3 | 1320-1390°C | 650 | 300 | 35 % |
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SMO 254 nuts offer exceptional corrosion resistance in highly aggressive environments, including seawater. Available in sizes ranging from M6 to M30 and various dimensions, they ensure secure fastening with high strength and durability.
SMO 254 Stud Bolts provide superior corrosion resistance against chloride-induced stress. They are commonly available in lengths from 50 mm to 300 mm and diameters from M6 to M30, designed for high-pressure and high-temperature applications.
SMO 254 Bolts deliver excellent resistance to pitting and crevice corrosion. Standard sizes range from M6 to M30, with lengths from 20 mm to 200 mm. These bolts are ideal for demanding environments requiring high strength and durability.
SMO 254 threaded rods offer outstanding resistance to corrosion and high temperatures. Typically available in diameters from M6 to M30 and lengths up to 3 meters, they are used for various construction and industrial applications.
SMO 254 screws provide exceptional corrosion resistance and are used in marine and chemical environments. Sizes generally range from M3 to M20, with lengths from 10 mm to 150 mm, suitable for precise fastening needs.
SMO 254 washers ensure high corrosion resistance and are used to distribute load and prevent damage. They are available in sizes from M6 to M30, with thicknesses typically ranging from 1 mm to 5 mm, suitable for various applications.
You’ll typically find SMO 254 fasteners in offshore oil rigs, marine structures, desalination plants, heat exchangers, pulp and paper processing, chemical storage tanks, and pharmaceutical equipment. They’re widely used in industries that demand the highest standards of hygiene, strength, and resistance to harsh chemicals and environmental conditions. SMO 254 fasteners provide a cost-effective solution in situations where nickel-based alloys might be overkill, delivering top-notch performance and lasting value.
These fasteners are made from a high-performance stainless steel alloy designed to meet industry standards for excellent corrosion resistance. SMO 254 fasteners are especially effective in harsh environments. With high levels of chloride such as ocean water. They are widely used in industries like chemical processing, maritime and oil and gas. Where conditions are tough. Built for strength and long-lasting performance these fasteners are often used in critical applications where there is a risk of corrosion problems like pitting, crevice corrosion, and stress corrosion cracking. Common uses include flange assemblies, bolts, nuts, and other fastening parts in high-stress and corrosive environments.
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