Weston Stainless, headquartered in Midland, UK, is a premier manufacturer and exporter of high-strength stainless steel products, delivering dependable and long-lasting solutions across industries. It is a specialist in SMO 254 Fasteners, an austenitic stainless steel of high alloy quality that is well recognized for its excellent corrosion resistance, particularly in chloride-containing and acidic environments. Produced in Grade SMO 254, these fasteners such as bolts, nuts, screws, washers, and studs provide superior strength, durability, and resistance to crevice corrosion and pitting. Made of chromium, nickel, molybdenum, and nitrogen, SMO 254 Fasteners are suitable for marine, offshore, chemical, and desalination use.
SMO 254 Fasteners consist of about 19.5-20.5% Chromium, 17.5-18.5% Nickel, 6-6.5% Molybdenum, 0.18-0.22% Nitrogen, 1% Silicon, 1% Manganese, 0.03% Carbon, 0.03% Phosphorus, and 0.01% Sulfur, with the balance being Iron. Their mechanical properties include tensile strength of 650-850 MPa, yield strength of about 300 MPa, elongation of 35-40%, and hardness to 100 HB. Their physical properties are a density of 8 g/cm³, thermal conductivity of 14.5 W/m·K, and an electrical resistivity of 850 nΩ·m, suitable for harsh conditions demanding higher corrosion resistance and higher durability.
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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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.
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.
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.
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.
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.
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.
SMO 254 Fasteners are extensively applied in industries demanding excellent corrosion resistance and high mechanical strength. In marine and offshore industries, they are utilized in shipbuilding, oil rigs, and desalination plants because of their seawater corrosion resistance. They are applied in heat exchangers, reactors, and piping systems in contact with aggressive chemicals in the chemical and petrochemical industries. They are also crucial in power stations, pulp and paper mills, and food factories where reliability against tough conditions is vital. Further, SMO 254 Fasteners are also applied in aviation, pharmaceutical, and sewage treatment for long reliability.
SMO 254 Fasteners are supplied with test certificates like Mill Test Certificates (MTC) according to EN 10204 3.1 or 3.2, third-party inspection reports, and other quality documents guaranteeing conformity to international standards. They are packaged securely in wooden boxes, cartons, or plastic wrapping to avoid damage during shipping. Trustworthy shipping arrangements are available for the domestic and global markets, guaranteeing safe, efficient, and timely delivery to customers.
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