At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Super Duplex S32906 (UNS S32906) Flat Washer built for demanding service. High-nitrogen 29Cr super duplex developed for umbilical tubing and severe seawater service. This technical datasheet covers the precise dimensional tolerances per ASME B18.22.1 and the material requirements dictated by ASTM A276 / A479.
A Super Duplex S32906 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 | Super Duplex S32906 Flat Washer | Material Category | Super Duplex Stainless Steel |
| Material Grade | Super Duplex S32906 (UNS S32906) | Fastener Spec | ASTM A276 / A479 |
| Dimension Spec | ASME B18.22.1 | Material Spec | ASTM A276 / A479 |
| 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 S32906 Flat Washer is manufactured from Super Duplex S32906, a super duplex stainless steel. 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 |
|---|---|---|---|---|
| S32906 | 1.4477 | X2CrNiMoN29-7-2 | – | – |
This section details the chemical composition limits and minimum mechanical properties governing Super Duplex S32906 (UNS S32906) fasteners, as dictated by ASTM A276 / A479 (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 28.0–30.0 |
| Nickel | 5.8–7.5 |
| Molybdenum | 1.5–2.6 |
| Nitrogen | 0.30–0.40 |
| Manganese | 0.80–1.50 |
| Carbon, max | 0.030 |
| Silicon, max | 0.50 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Solution-annealed bar (A1082) | 116 000 (800) | 80 000 (550) | 25 | ≤32 HRC |
Our Super Duplex S32906 flat washers are specified across the following industries and service conditions, drawing on the material’s core strengths:
Welding and heat-treatment procedures should be fully qualified, and service conditions reviewed against the certified pitting-resistance data, before use in critical applications.
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 A276 / A479 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 Super Duplex S32906 Flat Washer is a plain load-distribution washer manufactured from Super Duplex S32906 (UNS S32906). The product combines the ASME B18.22.1 dimensional geometry with the ASTM A276 / A479 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 Super Duplex S32906 product range.
Super Duplex S32906 is identified as UNS S32906. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4477, EN X2CrNiMoN29-7-2, British Standard –, –.
Super Duplex S32906 is a super duplex stainless steel known for very high pitting and crevice-corrosion resistance in aggressive chloride environments. Welding and heat-treatment procedures should be fully qualified, and service conditions reviewed against the certified pitting-resistance data, before use in critical applications.
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 Super Duplex S32906 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: Super Duplex S32906 / UNS S32906, nominal size, ASME B18.22.1 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
