Hastelloy C276 Washers

Hastelloy C276 Washers — Specifications & Dimensions

Hastelloy C276 washers distribute clamp load over a wider bearing area. TorqBolt manufactures Hastelloy C276 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

Hastelloy C276 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

Hastelloy C276 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.

Hastelloy — Ni-Cr-Mo / Ni-Mo Corrosion Alloys

Hastelloy is the trade designation for nickel-chromium-molybdenum (and nickel-molybdenum) alloys formulated for severe wet-corrosion service: hydrochloric, sulfuric, chloride pitting, crevice corrosion, and sour wells.

Hastelloy C-276 (UNS N10276) is the workhorse: 16% Cr, 16% Mo, 4% W — the only nickel alloy resistant to wet chlorine + hypochlorite. C-22 upgrades Cr for oxidizing-acid performance. C-2000 adds Cu for full-pH service. B-3 is Ni-Mo for hot HCl. G-35 targets phosphoric-acid plants.

Hastelloy fasteners ship per ASTM B574 / B575 with EN 10204 3.1 / 3.2 certification including PMI and intergranular-corrosion testing per ASTM G28. NACE MR0175 / ISO 15156 sour-service compliance standard.

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