Harsh Metalloys, a well-respected manufacturer and supplier located in Mumbai, India, specializes in high-performance SMO 254 Fasteners that are perfect for extreme environments with high chloride levels and aggressive corrosion. SMO 254 (UNS S31254) is a super austenitic stainless steel known for its impressive strength, resistance to pitting and crevice corrosion, and high ductility. Our range of SMO 254 fasteners—including bolts, nuts, screws, washers, and studs—meets international standards like ASTM A479 and DIN specifications. These fasteners find extensive use in industries such as chemical processing, offshore oil and gas, desalination, marine, and power generation.
SMO 254 Fasteners are made up of about 20% Chromium, 18% Nickel, 6% Molybdenum, along with some Nitrogen and Copper. This unique high-alloy blend offers exceptional corrosion resistance, particularly against chlorides and reducing acids. SMO 254 boasts high tensile strength (≥ 650 MPa), yield strength (≥ 300 MPa), and impressive elongation (≥ 35%), along with good impact toughness even in sub-zero conditions. These fasteners are non-magnetic, highly weldable, and provide outstanding pitting resistance (PREN ≥ 42.5). Their metallurgical stability and mechanical reliability make them perfect for critical service applications.
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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When it comes to corrosion resistance, SMO 254 nuts really shine, especially in seawater and environments rich in chlorides. They’re perfect for offshore, chemical, and marine fastening applications that demand high strength.
SMO 254 stud bolts are known for their impressive strength and resistance to crevice corrosion, making them an excellent choice for pressure vessels, desalination plants, and marine applications that face tough chemical conditions.
With outstanding mechanical performance and pitting resistance, SMO 254 bolts are widely utilized in offshore platforms, pulp mills, and flue gas cleaning systems.
SMO 254 threaded rods boast remarkable resistance to stress corrosion cracking, making them suitable for structural and anchoring systems in chemical plants, seawater applications, and power plants.
Combining high tensile strength with excellent corrosion resistance, SMO 254 screws are ideal for fastening components in challenging environments like marine, petrochemical, and food processing industries.
SMO 254 washers ensure reliable load distribution and corrosion protection, making them a go-to choice for fasteners in aggressive settings such as offshore structures, desalination systems, and chemical processing units.
SMO 254 Fasteners are extensively used in highly corrosive environments such as offshore oil rigs, seawater handling systems, heat exchangers, pulp and paper processing, and flue gas cleaning systems. Their superior resistance to pitting, crevice corrosion, and stress corrosion cracking makes them ideal for use in desalination plants and marine applications. These fasteners are also utilized in pharmaceutical, food processing, and chemical plants where both cleanliness and corrosion resistance are vital. Their strength, formability, and corrosion-resistant profile offer a long-lasting fastening solution in harsh and chloride-rich operational settings.
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