At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Ferralium 255 (S32550) (UNS S32550) Hex Bolt (Precision) built for demanding service. Copper-bearing super duplex combining high strength with excellent resistance to sulphuric acid and seawater. This technical datasheet covers the precise dimensional tolerances per BS 3692 and the material requirements dictated by ASTM A1082 UNS S32550 and ASTM A276 / A479.
A Ferralium 255 Precision Hex Bolt is machined to tighter dimensional tolerances than a standard commercial bolt, suiting close-tolerance mechanical and structural 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 hex bolts are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | Ferralium 255 (S32550) Hex Bolt (Precision) | Material Category | Super Duplex Stainless Steel |
| Material Grade | Ferralium 255 (S32550) (UNS S32550) | Fastener Spec | ASTM A1082 UNS S32550 |
| Dimension Spec | BS 3692 | Material Spec | ASTM A276 / A479 |
| Thread Standard | ASME B1.1 (UNC, UNF, 8UN) | Thread Tolerance | Class 2A / 3A |
The BS 3692 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. BS 3692 covers precision hex bolts manufactured to close (Class A) tolerances.
| Nominal Thread (d) | Pitch (mm) | Width Across Flats s (mm) | Width Across Corners e (min, mm) | Head Height k (mm) |
|---|---|---|---|---|
| M6 | 1.0 | 10.00 | 11.05 | 4.0 |
| M8 | 1.25 | 13.00 | 14.38 | 5.3 |
| M10 | 1.5 | 16.00 | 17.77 | 6.4 |
| M12 | 1.75 | 18.00 | 20.03 | 7.5 |
| M16 | 2.0 | 24.00 | 26.75 | 10.0 |
| M20 | 2.5 | 30.00 | 33.53 | 12.5 |
| M24 | 3.0 | 36.00 | 39.98 | 15.0 |
| M30 | 3.5 | 46.00 | 50.85 | 18.7 |
| M36 | 4.0 | 55.00 | 60.79 | 22.5 |
Precision-series bolts are held to tighter head, shank and thread tolerances than commercial-grade bolts. Buyers should confirm the required nominal diameter, thread series, length and tolerance class against the purchase drawing or applicable standard before ordering.
The UNS S32550 Hex Bolt (Precision) is manufactured from Ferralium 255, 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 |
|---|---|---|---|---|
| S32550 | 1.4507 | X2CrNiMoCuN25-6-3 | – | – |
This section details the chemical composition limits and minimum mechanical properties governing Ferralium 255 (S32550) (UNS S32550) fasteners, as dictated by ASTM A1082 UNS S32550 (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 24.0–27.0 |
| Nickel | 4.5–6.5 |
| Molybdenum | 2.9–3.9 |
| Copper | 1.5–2.5 |
| Nitrogen | 0.10–0.25 |
| Manganese, max | 1.5 |
| Carbon, max | 0.04 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Solution-annealed & aged bar | 110 000 (760) | 80 000 (550) | 15 | – |
Our Ferralium 255 (S32550) hex bolts 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 Hex 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 BS 3692 for dimensional requirements and ASTM A1082 UNS S32550 for material and fastener requirements. The applicable standard edition and purchase requirements should be confirmed for every project.
For BSI standards information, see the BSI 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 Ferralium 255 Hex Bolt (Precision) is a precision-machined, externally hex-driven bolt manufactured from Ferralium 255 (UNS S32550). The product combines the BS 3692 dimensional geometry with the ASTM A1082 UNS S32550 material and fastener requirements.
The dimensional information in this datasheet is based on BS 3692, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Ferralium 255 product range.
Ferralium 255 is identified as UNS S32550. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4507, EN X2CrNiMoCuN25-6-3, British Standard –, –.
Ferralium 255 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 Ferralium 255 Hex Bolt (Precision) 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: Ferralium 255 / UNS S32550, nominal size, BS 3692 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
