Stainless Steel SMO 254 Studbolts

Stainless Steel SMO 254 Stud Bolts — Specifications & Dimensions

Stainless Steel SMO 254 stud bolts are double-end threaded rods used in flanged-joint pressure-vessel and piping assemblies. TorqBolt manufactures Stainless Steel SMO 254 stud bolts per ASTM A193 (alloy steel) / ASTM A453 (high-temperature) / EN 10269, in diameters from 1/4" to 4" and lengths from 25 mm to 3 m.

End Configurations

Thread & Length

Stainless Steel SMO 254 stud bolt threads per ASME B1.1 (UNC for <1", 8UN for ≥1.125", per ASME B16.5 §A); ISO metric on request. Length under nut measured per ASME B16.5 Annex A. Standard end-chamfer 45° for thread protection in handling.

Mechanical & Certification

Stainless Steel SMO 254 stud bolts ship with matching ASTM A194 nuts (2H, 7, 7M, 16 grades) per the parent stud spec. Each lot includes EN 10204 3.1 / 3.2 certificates with chemistry, mechanicals, hardness, and through-hardness traverse testing per ASTM A370. NACE MR0175 / ISO 15156 sour-service certification standard. Pre-stretched / pre-loaded studs supplied per customer specification.

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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