At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Duplex 2205 (UNS S32205) Hex Nut built for demanding service. The most-specified 22Cr duplex stainless, offering roughly twice the yield strength of 316 with excellent chloride SCC resistance. This technical datasheet covers the precise dimensional tolerances per ASME B18.2.2 and the material requirements dictated by ASTM A194 Gr 8 (mod.) and ASTM A276 / A479.
A Duplex 2205 Hex Nut is the standard mating nut for general-purpose bolted assemblies and is manufactured to match the thread series of its corresponding bolt. The tables below provide the principal dimensions, equivalent material grades, chemical composition and mechanical properties covered by the technical data for this product.
Our hex nuts are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | Duplex 2205 Hex Nut | Material Category | Duplex Stainless Steel |
| Material Grade | Duplex 2205 (UNS S32205) | Fastener Spec | ASTM A194 Gr 8 (mod.) |
| Dimension Spec | ASME B18.2.2 | Material Spec | ASTM A276 / A479 |
| Thread Standard | ASME B1.1 (UNC, UNF, 8UN) | Thread Tolerance | Class 2B / 3B (Internal) |
The ASME B18.2.2 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads.
| Nominal Size (in) | Width Across Flats (Max – Min) | Width Across Corners (Max) | Thickness (Max – Min) |
|---|---|---|---|
| 1/4″ | 0.438 – 0.428 | 0.505 | 0.226 – 0.212 |
| 5/16″ | 0.500 – 0.489 | 0.577 | 0.273 – 0.258 |
| 3/8″ | 0.562 – 0.551 | 0.650 | 0.337 – 0.320 |
| 1/2″ | 0.750 – 0.736 | 0.866 | 0.448 – 0.427 |
| 5/8″ | 0.938 – 0.922 | 1.083 | 0.559 – 0.535 |
| 3/4″ | 1.125 – 1.088 | 1.299 | 0.665 – 0.617 |
| 1″ | 1.500 – 1.450 | 1.732 | 0.887 – 0.831 |
The nut thread is manufactured to match the corresponding bolt thread series and class. Buyers should confirm the required nominal size, thread series and thread class against the purchase drawing or applicable standard before ordering.
The UNS S32205 Hex Nut is manufactured from Duplex 2205, a 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 |
|---|---|---|---|---|
| S32205 | 1.4462 | X2CrNiMoN22-5-3 | 318 S13 | Z3 CND 22-05 Az (AFNOR) |
This section details the chemical composition limits and minimum mechanical properties governing Duplex 2205 (UNS S32205) fasteners, as dictated by ASTM A194 Gr 8 (mod.) (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 22.0–23.0 |
| Nickel | 4.5–6.5 |
| Molybdenum | 3.0–3.5 |
| Nitrogen | 0.14–0.20 |
| Manganese, max | 2.0 |
| Carbon, max | 0.030 |
| Silicon, max | 1.0 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Solution-annealed bar (A1082) | 95 000 (655) | 65 000 (450) | 25 | ≤31 HRC |
Our Duplex 2205 hex nuts are specified across the following industries and service conditions, drawing on the material’s core strengths:
Service above the recommended sensitisation temperature range, or in sour/high-chloride conditions, should be reviewed with the project engineer before final material selection.
Every batch of Hex Nuts 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 B18.2.2 for dimensional requirements and ASTM A194 Gr 8 (mod.) 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 Duplex 2205 Hex Nut is a standard hex-driven nut manufactured from Duplex 2205 (UNS S32205). The product combines the ASME B18.2.2 dimensional geometry with the ASTM A194 Gr 8 (mod.) material and fastener requirements.
The dimensional information in this datasheet is based on ASME B18.2.2, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Duplex 2205 product range.
Duplex 2205 is identified as UNS S32205. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4462, EN X2CrNiMoN22-5-3, British Standard 318 S13, Z3 CND 22-05 Az (AFNOR).
Duplex 2205 is a duplex stainless steel known for high strength combined with strong resistance to chloride stress-corrosion cracking. Service above the recommended sensitisation temperature range, or in sour/high-chloride conditions, should be reviewed with the project engineer before final material selection.
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 Duplex 2205 Hex Nut 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: Duplex 2205 / UNS S32205, nominal size, ASME B18.2.2 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
