At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Alloy 3127 hMo (Alloy 31) (UNS N08031) Hex Bolt built for demanding service. Super-austenitic Ni-Cr-Mo-Cu alloy with a very high PREN for concentrated sulphuric acid and high-chloride service. This technical datasheet covers the precise dimensional tolerances per ASME B18.2.1 and the material requirements dictated by ASTM F468 Gr N08031 and ASTM B649.
A Alloy 3127 hMo Hex Bolt uses a hexagonal head for wrench or socket tightening and is one of the most widely specified fastener forms in industrial assembly. 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 | Alloy 3127 hMo (Alloy 31) Hex Bolt | Material Category | High-Nickel Alloy |
| Material Grade | Alloy 3127 hMo (Alloy 31) (UNS N08031) | Fastener Spec | ASTM F468 Gr N08031 |
| Dimension Spec | ASME B18.2.1 | Material Spec | ASTM B649 |
| Thread Standard | ASME B1.1 (UNC, UNF, 8UN) | Thread Tolerance | Class 2A / 3A |
The ASME B18.2.1 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads.
| Nominal Size (in) | Body Diameter (Max – Min) | Width Across Flats (Max – Min) | Width Across Corners (Max – Min) | Head Height (Max – Min) |
|---|---|---|---|---|
| 1/4″ | 0.260 – 0.237 | 0.438 – 0.425 | 0.505 – 0.484 | 0.163 – 0.150 |
| 5/16″ | 0.324 – 0.298 | 0.500 – 0.484 | 0.577 – 0.552 | 0.211 – 0.195 |
| 3/8″ | 0.388 – 0.360 | 0.562 – 0.544 | 0.650 – 0.620 | 0.243 – 0.226 |
| 1/2″ | 0.515 – 0.482 | 0.750 – 0.725 | 0.866 – 0.826 | 0.323 – 0.302 |
| 5/8″ | 0.642 – 0.605 | 0.938 – 0.906 | 1.083 – 1.033 | 0.403 – 0.378 |
| 3/4″ | 0.768 – 0.729 | 1.125 – 1.088 | 1.299 – 1.240 | 0.483 – 0.455 |
| 1″ | 1.022 – 0.976 | 1.500 – 1.450 | 1.732 – 1.653 | 0.627 – 0.591 |
The hex head permits assembly with a standard wrench or socket. Buyers should confirm the required nominal diameter, thread series, length and thread class against the purchase drawing or applicable standard before ordering.
The UNS N08031 Hex Bolt is manufactured from Alloy 3127 hMo, 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 |
|---|---|---|---|---|
| N08031 | 1.4562 | X1NiCrMoCu32-28-7 | – | – |
This section details the chemical composition limits and minimum mechanical properties governing Alloy 3127 hMo (Alloy 31) (UNS N08031) fasteners, as dictated by ASTM F468 Gr N08031 (chemistry & mechanicals) and the raw bar/rod standard ASTM B649.
| Element | Composition, % |
|---|---|
| Nickel | 30.0–32.0 |
| Chromium | 26.0–28.0 |
| Iron | Balance |
| Molybdenum | 6.0–7.0 |
| Copper | 1.0–1.4 |
| Nitrogen | 0.15–0.25 |
| Carbon, max | 0.015 |
| Manganese, max | 2.0 |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Solution-annealed bar | 94 000 (650) | 40 000 (276) | 40 | – |
Our Alloy 3127 hMo (Alloy 31) hex bolts 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 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 ASME B18.2.1 for dimensional requirements and ASTM F468 Gr N08031 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 3127 hMo Hex Bolt is an externally hex-driven bolt with a fully or partially threaded shank manufactured from Alloy 3127 hMo (UNS N08031). The product combines the ASME B18.2.1 dimensional geometry with the ASTM F468 Gr N08031 material and fastener requirements.
The dimensional information in this datasheet is based on ASME B18.2.1, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Alloy 3127 hMo product range.
Alloy 3127 hMo is identified as UNS N08031. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4562, EN X1NiCrMoCu32-28-7, British Standard –, –.
Alloy 3127 hMo 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 3127 hMo Hex Bolt 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 3127 hMo / UNS N08031, nominal size, ASME B18.2.1 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
