Stainless Steel SMO 254 Washers

Stainless Steel SMO 254 Washers — Specifications & Dimensions

Stainless Steel SMO 254 washers distribute clamp load over a wider bearing area. TorqBolt manufactures Stainless Steel SMO 254 washers per ASME B18.21.1 / B18.22.1, DIN 125 / 126 / 127 / 9021, and ISO 7089 / 7090 / 7093 / 7094, in metric (M3–M100) and imperial (#4–4") sizes.

Plain Washer Dimensions

Stainless Steel SMO 254 plain washers are characterized by ID (clearance), OD (load distribution area), and thickness. Standard tolerances h13 on OD, H13 on ID per ISO 286-2; flatness and parallelism 0.05 mm/100 mm verified per lot.

Form Variants

Hardness & Surface

Stainless Steel SMO 254 washers are hardness-controlled to balance load-distribution stiffness against surface damage. Typical Vickers HV: plain 140–180; spring 380–440; Belleville 460–540. Surface finish Ra 1.6 µm or better. EN 10204 3.1 / 3.2 certs standard; NACE MR0175 on request.

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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