Stainless Steel 904L Washers

Stainless Steel 904l Washers, Specifications & Dimensions

Stainless Steel 904l washers distribute clamp load over a wider bearing area. TorqBolt manufactures Stainless Steel 904l 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 904l 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 904l 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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