At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Alloy A286 (UNS S66286) Flat Washer built for demanding service. Fe-Ni-Cr precipitation-hardened superalloy for high-strength bolting to 700°C; governed by ASTM A453/A638 Grade 660. This technical datasheet covers the precise dimensional tolerances per ASME B18.22.1 and the material requirements dictated by ASTM A638 Gr 660.
A Alloy A286 Flat Washer distributes fastener load evenly across a joint while resisting the fretting and corrosion that carbon-steel washers are prone to in marine, electrical and outdoor service. The tables below provide the principal dimensions, equivalent material grades, chemical composition and mechanical properties covered by the technical data for this product.
Our flat washers are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | Alloy A286 Flat Washer | Material Category | High-Nickel Alloy |
| Material Grade | Alloy A286 (UNS S66286) | Fastener Spec | ASTM A638 Gr 660 |
| Dimension Spec | ASME B18.22.1 | Material Spec | ASTM A638 Gr 660 |
| Thread Standard | N/A (Plain Washer) | Thread Tolerance | Inside-diameter tolerance per standard |
The ASME B18.22.1 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. ASME B18.22.1 governs Type A plain (flat) washers.
| Nominal Size (in) | Inside Diameter (in) | Outside Diameter (in) | Thickness (in) |
|---|---|---|---|
| 1/4″ | 0.281 | 0.625 | 0.065 |
| 5/16″ | 0.344 | 0.688 | 0.065 |
| 3/8″ | 0.406 | 0.812 | 0.065 |
| 1/2″ | 0.531 | 1.062 | 0.095 |
| 5/8″ | 0.656 | 1.312 | 0.095 |
| 3/4″ | 0.812 | 1.469 | 0.134 |
| 1″ | 1.062 | 2.000 | 0.134 |
This dimensional series carries a chamfered outer edge and is the standard flat washer configuration for general assembly. Buyers should confirm the required nominal diameter, inside-diameter clearance class and outside diameter against the purchase drawing or applicable standard before ordering.
The UNS S66286 Flat Washer is manufactured from Alloy A286, a high-nickel alloy. The equivalent designations below assist with cross-referencing this material against European, British and other national standards.
| US / UNS | Werkstoff Nr. (DIN) | European (EN) | British Standard (BS) | Other / AFNOR |
|---|---|---|---|---|
| S66286 | 1.4980 | X5NiCrTi26-15 | HR51 | Z6 NCT 25 (AFNOR) |
This section details the chemical composition limits and minimum mechanical properties governing Alloy A286 (UNS S66286) fasteners, as dictated by ASTM A638 Gr 660 (chemistry & mechanicals) and the raw bar/rod standard ASTM A638 Gr 660.
| Element | Composition, % |
|---|---|
| Nickel | 24.0–27.0 |
| Chromium | 13.5–16.0 |
| Iron | Balance |
| Molybdenum | 1.0–1.5 |
| Titanium | 1.9–2.35 |
| Vanadium | 0.10–0.50 |
| Aluminium, max | 0.35 |
| Carbon, max | 0.08 |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Solution-treated & aged (Class A) | 130 000 (895) | 85 000 (585) | 15 | 248–341 HB |
Our Alloy A286 flat washers are specified across the following industries and service conditions, drawing on the material’s core strengths:
For severe sour, high-temperature or highly acidic service, the exact operating conditions should be reviewed against the alloy’s certified data rather than general nickel-alloy assumptions.
Every batch of Flat Washers produced undergoes rigorous internal and third-party testing to ensure zero-defect delivery. We supply complete traceability with our global shipments.
For technical documentation and quotations, buyers can also review the Ananka Fasteners manufacturing and supply range or contact the team through the fastener enquiry and technical support page.
This datasheet references ASME B18.22.1 for dimensional requirements and ASTM A638 Gr 660 for material and fastener requirements. The applicable standard edition and purchase requirements should be confirmed for every project.
For ASME standards information, see the ASME standards catalogue. For ASTM International material and fastener specifications, see the ASTM International standards catalogue. These external references are provided for standards identification; the purchaser should verify the current edition applicable to the order.
A Alloy A286 Flat Washer is a plain load-distribution washer manufactured from Alloy A286 (UNS S66286). The product combines the ASME B18.22.1 dimensional geometry with the ASTM A638 Gr 660 material and fastener requirements.
The dimensional information in this datasheet is based on ASME B18.22.1, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Alloy A286 product range.
Alloy A286 is identified as UNS S66286. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4980, EN X5NiCrTi26-15, British Standard HR51, Z6 NCT 25 (AFNOR).
Alloy A286 is a high-nickel alloy known for excellent resistance to high-temperature oxidation and aggressive chemical environments. For severe sour, high-temperature or highly acidic service, the exact operating conditions should be reviewed against the alloy’s certified data rather than general nickel-alloy assumptions.
The product information supports standard and custom configurations. For a quotation, provide the required material grade, nominal size, dimensional requirement, quantity, standard and any inspection or certificate requirements.
Need a Alloy A286 Flat Washer for an industrial project? Send the required size, quantity, standard and certification requirements to Ananka Fasteners. Our team can review the requirement and provide technical and commercial information for standard or custom configurations.
Recommended RFQ details: Alloy A286 / UNS S66286, nominal size, ASME B18.22.1 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
