At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Duplex 2205 (S31803) (UNS S31803) Stud Bolt (Threaded Both Ends) built for demanding service. Original 2205 chemistry (A182 F51 equivalent) with the balanced ferrite-austenite structure of standard duplex. This technical datasheet covers the precise dimensional tolerances per ASME B16.5 and the material requirements dictated by ASTM A1082 UNS S31803 and ASTM A276 / A479.
A Duplex 2205 (old) Stud Bolt is threaded on both ends to carry a nut at each side of a flange or pressure-boundary joint, and is a core component of bolted flange assemblies. The tables below provide the principal dimensions, equivalent material grades, chemical composition and mechanical properties covered by the technical data for this product.
Our stud bolts are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | Duplex 2205 (S31803) Stud Bolt (Threaded Both Ends) | Material Category | Duplex Stainless Steel |
| Material Grade | Duplex 2205 (S31803) (UNS S31803) | Fastener Spec | ASTM A1082 UNS S31803 |
| Dimension Spec | ASME B16.5 | Material Spec | ASTM A276 / A479 |
| Thread Standard | ASME B1.1 (UNC, UNF, 8UN) | Thread Tolerance | Class 2A / 3A |
The ASME B16.5 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. Stud bolt diameter, quantity and length are set by the mating flange size and pressure class per ASME B16.5. Values shown are for raised-face flanges; ring-joint flanges require longer studs.
| Flange NPS | Bolt Dia (in) | No. of Bolts | Stud Length Class 150 (in) | Stud Length Class 300 (in) |
|---|---|---|---|---|
| 1/2″ | 1/2 | 4 | 2-1/4 | 2-1/2 |
| 3/4″ | 1/2 | 4 | 2-1/2 | 2-3/4 |
| 1″ | 1/2 | 4 | 2-1/2 | 3 |
| 1-1/2″ | 1/2 | 4 | 3 | 3-1/2 |
| 2″ | 5/8 | 4 | 3-1/2 | 4-1/4 |
| 3″ | 5/8 | 4 | 4 | 4-1/2 |
| 4″ | 5/8 | 8 | 4 | 5 |
| 6″ | 3/4 | 8 | 4-1/2 | 5-1/2 |
Threaded-both-ends studs are supplied to a specified overall length so that a nut can be run down each end of a flange or pressure-boundary joint. Buyers should confirm the required nominal diameter, thread series, overall length and thread length against the purchase drawing, flange rating and gasket requirement before ordering.
The UNS S31803 Stud Bolt (Threaded Both Ends) is manufactured from Duplex 2205 (old), 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 |
|---|---|---|---|---|
| S31803 | 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 (S31803) (UNS S31803) fasteners, as dictated by ASTM A1082 UNS S31803 (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 21.0–23.0 |
| Nickel | 4.5–6.5 |
| Molybdenum | 2.5–3.5 |
| Nitrogen | 0.08–0.20 |
| 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) | 90 000 (620) | 65 000 (450) | 25 | ≤31 HRC |
Our Duplex 2205 (S31803) stud bolts 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 Stud Bolts 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 B16.5 for dimensional requirements and ASTM A1082 UNS S31803 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 (old) Stud Bolt (Threaded Both Ends) is a stud threaded on both ends for flange and pressure-boundary assembly manufactured from Duplex 2205 (old) (UNS S31803). The product combines the ASME B16.5 dimensional geometry with the ASTM A1082 UNS S31803 material and fastener requirements.
The dimensional information in this datasheet is based on ASME B16.5, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Duplex 2205 (old) product range.
Duplex 2205 (old) is identified as UNS S31803. 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 (old) 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 (old) Stud Bolt (Threaded Both Ends) 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 (old) / UNS S31803, nominal size, ASME B16.5 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
