Mitchell Stainless, a trusted manufacturer and supplier in Hamilton, New Zealand, offers high-performance SMO 254 fasteners designed for extreme corrosion resistance and durability in aggressive industrial environments. SMO 254 is a super austenitic stainless steel with excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for chemical, marine, and offshore applications. Mitchell Stainless ensures each fastener meets stringent quality standards, providing precise dimensions, consistent mechanical performance, and long-term reliability. These fasteners are engineered to deliver strong, dependable fastening solutions in highly corrosive and demanding operating conditions.
SMO 254 fasteners are composed primarily of iron, with 20–22% chromium, 18–20% nickel, 6–7% molybdenum, and small amounts of nitrogen, manganese, and carbon. This alloying provides superior resistance to pitting and crevice corrosion, high tensile strength, and excellent toughness. The combination of chromium, nickel, and molybdenum ensures excellent durability in chloride-rich and acidic environments, while nitrogen enhances strength and corrosion resistance. These fasteners maintain mechanical integrity and long-term performance even in aggressive chemical and marine conditions.
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.
All our products undergo quality standards tests such as material tests, performances tests, and corrosion resistance tests. They are realized by thorough third-party inspections so as to ascertain their credibility. We also guarantee on-time delivery as we ensure promptness in our operations so that customers will receive orders right on time according to their project schedules and quality standards.
SMO 254 fasteners are widely used in chemical processing plants, petrochemical facilities, offshore platforms, desalination plants, and marine environments where corrosion resistance and mechanical strength are critical. Typical applications include bolting of flanges, valves, pressure vessels, piping systems, and industrial equipment exposed to chloride-rich or acidic environments. They are also ideal for maintenance and repair projects requiring durable, corrosion-resistant fasteners. In New Zealand’s industrial and fabrication sectors, SMO 254 fasteners are valued for producing long-lasting, high-quality assemblies that maintain structural integrity, resist aggressive corrosion, and provide reliable performance under extreme environmental conditions.
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