Stainless Steel SMO 254 Fasteners

Stainless Steel SMO 254 Fasteners, Material Overview & Form Factors

Stainless Steel SMO 254 is a high-performance alloy used wherever standard fasteners cannot meet the corrosion, temperature, or strength envelope. TorqBolt manufactures the full Stainless Steel SMO 254 fastener range, bolts, nuts, screws, washers, studs, and custom forgings, under one ISO 9001:2015 quality system, with PED 2014/68/EU module-H qualification for pressure-equipment service.

Where Stainless Steel SMO 254 Excels

Stainless Steel SMO 254 is specified in oil & gas wellhead components, refinery heat exchangers, petrochemical reactors, power-generation turbines, marine offshore platforms, and pharmaceutical / food-grade processing. Its corrosion resistance, high-temperature strength, and weldability make it the default for service conditions outside the carbon and standard-stainless envelope.

Form Factors Available

Standards & Certification

Stainless Steel SMO 254 fasteners are supplied with EN 10204 3.1 (mill cert) or 3.2 (third-party witnessed) material test reports as standard. Additional certification packages: NACE MR0175 / ISO 15156, NORSOK M-650, API 6A (wellhead), API 20E (subsea bolting), PED 2014/68/EU. Third-party inspection by TUV, Lloyd's, BV, DNV, SGS, and Intertek arrangeable on order.

Austenitic Stainless Steel (300-series)

Austenitic stainless steels are the workhorse 300-series Fe-Cr-Ni alloys delivering excellent corrosion resistance, formability, weldability, and toughness from cryogenic to ~600°C.

AISI 304 is the baseline; 304L prevents weld sensitization. 316 adds Mo for chloride pitting; 316L is the marine welding-grade. 309 / 310 are high-Cr for ~1100°C. 321 / 347 are Ti / Nb-stabilized.

Austenitic fasteners are supplied per ASTM A193 grade B8 (304), B8M (316), B8T (321), B8C (347). EN 10204 3.1 / 3.2 certs cover mechanicals, hardness (HB ~150-217), and ASTM A262 Practice E intergranular corrosion testing.

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