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SMO 254 Nuts are top-notch, corrosion-resistant fasteners built for tough marine, chemical, and industrial settings. Made from SMO 254, a high-alloy austenitic stainless steel that’s rich in molybdenum and nitrogen, these nuts excel at resisting pitting, crevice corrosion, and stress corrosion cracking. Suppliers like Aria Fasteners in Hamilton, New Zealand, guarantee precise threading, consistent dimensions, and adherence to international quality standards. SMO 254 Nuts are perfect for securing bolts and stud bolts in pipelines, flanges, pumps, and pressure vessels that operate in harsh or chloride-heavy environments.
These nuts are primarily made up of iron, chromium, nickel, molybdenum, and nitrogen, all of which boost their corrosion resistance, mechanical strength, and fatigue resistance. On the mechanical side, they deliver high tensile and yield strength, outstanding toughness, and stability under heavy loads and thermal cycling. Their unique alloy composition ensures they remain reliable in seawater, chemical processing, and high-temperature industrial settings, keeping fastenings secure and joints intact even in extreme conditions.
| Grade | Ni | C | Mo | Mn | Si | F | Cu | S | P | Cr |
| SMO 254 | 17.5 – 18.5 | 0.02 max | 6 – 6.5 | 1 max | 0.8 max | – | 0.5 – 1 | 0.01 max | 0.03 max | 19.5 – 20.5 |
| Element | Density | Melting Point | Yield Strength (0.2%Offset | Tensile Strength | Elongation |
| SMO 254 | 8.0 g/cm3 | 1320-1390 ℃ | 300 | 650 | 35 % |
Standard ASTM A182, A479 / ASME SA182, SA479
Dimensions DIN 934/936/982/985, ISO 4032 / 4033 /4035, ASME B18.2.2, B18.2.4.6M
Threads Configuration ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Size M6-M100
Type Cold Forged, Hot Forged, Bar Stock Machined, Bar Stock Milling
Length 3 mm to 200 mm
Grade SMO 254 F44 UNS (S31254), DIN (1.4547)
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
SMO 254 nuts are quite popular in marine applications such as ships and offshore platforms because of their excellent resistance to corrosion by sea water. They are also used in chemical processing industries because they are able to endure harsh chemicals as well as high temperatures. Furthermore, these nuts are used in heat exchangers, pulp and paper industries and other industries where strength and corrosion resistance are very important for the nuts to provide the best performance for the longest time possible.
You’ll find SMO 254 Nuts commonly used in offshore oil and gas platforms, chemical processing plants, desalination systems, power generation facilities, and marine engineering. They’re ideal for securing flanges, pipelines, pumps, valves, and structural components that face corrosive chemicals or chloride-rich environments. These nuts help prevent loosening, maintain joint integrity, and offer long-lasting durability. SMO 254 Nuts are also utilized in pharmaceutical, food processing, and specialized industrial applications where corrosion resistance, high strength, and dependable fastening performance are crucial.
Aria Fasteners is a leading manufacturer and supplier of high-quality fasteners in Hamilton, New Zealand, with over 8 years of experience serving global industries.
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