SMO 254 fasteners are carefully made from a high-alloy austenitic stainless steel known as SMO 254 (UNS S31254). This material provides outstanding resistance to corrosion in harsh environments, including those with chlorides and acids. It is especially suitable for highly corrosive settings like chemical processing, offshore and marine industries, and pulp and paper production. With excellent toughness, strength, and weldability, SMO 254 is ideal for critical components exposed to extreme conditions.
UNS S31254 fasteners come in various shapes and sizes, such as bolts, screws, nuts, washers, and studs. They are widely used in industrial applications for tasks like joining parts, sealing against pressure, preventing vibration, and creating strong connections without compromising structural integrity. Their versatility and reliability make them essential for industries needing dependable fastening solutions. Additionally, SMO 254 fasteners are perfect for environments where resistance to chloride-induced stress corrosion cracking is crucial, such as seawater desalination plants and chemical processing facilities. Whatever the application, these fasteners provide exceptional corrosion resistance and mechanical performance, ensuring durability and reliability in challenging conditions..
Standard SMO 254 Fasteners specifications as per the Fasteners manufacturers.
| Material | SMO 254 (UNS S31254) |
| Specification | IS/BS/ASTM |
| Standards | ASTM A479 |
| Size | 3 mm to 200 mm |
| Length | M02 to M30 |
Each SMO 254 Fasteners have unique design each of them are used in specific applications. Some of them are mentioned below.
Note that this chart includes only some of the most common sizes of SMO 254 Bolt. There are many other sizes available as well, and some applications may require custom sizes or special configurations.
| SMO 254 Fasteners | Element (% By Mass) |
|---|---|
| Chromium (Cr) | 19.5–20.5% |
| Nickel (Ni) | 17.5–18.5% |
| Molybdenum (Mo) | 6.0–6.5% |
| Copper (Cu) | 0.5–1.0% |
| Iron (Fe) | Balance |
| Manganese (Mn) | ≤1.00% |
| Silicon (Si) | ≤0.80% |
| Carbon (C) | ≤0.020% |
| Phosphorus (P) | ≤0.030% |
| Sulfur (S) | ≤0.010% |
| Nitrogen (N) | 0.18–0.22% |
| Density | 8.0 g/cm³ |
| Melting Point | 1320 – 1390°C (2410 – 2530°F) |
| Tensile Strength | ≥650 MPa (≥94 ksi) |
| Yield Strength (0.2%Offset) | ≥300 MPa (≥44 ksi) |
| Elongation | ≥35% |
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