Stainless Steel A286 Washers

A286 Washers — Specifications & Dimensions

A286 washers distribute clamp load over a wider bearing area. TorqBolt manufactures A286 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

A286 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

A286 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.

A286 — Iron-Nickel-Chromium Superalloy

A-286 (UNS S66286, AISI 660) is an iron-nickel-chromium age-hardenable superalloy positioned between austenitic stainless and Inconel for high-temperature bolting at 700-1300°F (370-700°C). 26% Ni + 15% Cr + 1.25% Mo with Ti-Al precipitation hardening.

A-286 is the standard for steam-turbine bolting, gas-turbine combustor cases, jet-engine shafts, and superheater bolting. Two-step heat treatment: solution at 980°C (water quench) + ageing at 720°C for 16 hours yields tensile ~895 MPa, yield ~585 MPa, elongation >15%.

A-286 fasteners ship per ASTM A453 grade 660 (classes A/B/C/D) and AMS 5731 / 5732 / 5734 / 5737 with EN 10204 3.1 / 3.2 certification and stress-rupture testing. NACE MR0175 / ISO 15156 sour-service compliance achievable in specific heat-treat conditions.

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