Alloy 3127 hMo Flat Washer – DIN 125 – ASTM B649

At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium Alloy 3127 hMo (Alloy 31) (UNS N08031) Flat Washer 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 DIN 125 and the material requirements dictated by ASTM B649.

A Alloy 3127 hMo 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.

1. Alloy 3127 hMo Flat Washer Specifications

Our flat washers are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.

2. DIN 125 Flat Washer Dimensions

The DIN 125 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. DIN 125 Form A governs metric plain (flat) washers with a chamfered edge.

Form and Tolerance Notes

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.

3. Alloy 3127 hMo Equivalent Grades

The UNS N08031 Flat Washer 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.

4. ASTM B649 Material Requirements

This section details the chemical composition limits and minimum mechanical properties governing Alloy 3127 hMo (Alloy 31) (UNS N08031) fasteners, as dictated by ASTM B649 (chemistry & mechanicals) and the raw bar/rod standard ASTM B649.

■ Chemical Composition

■ Mechanical Properties

5. Flat Washer Applications

Our Alloy 3127 hMo (Alloy 31) flat washers are specified across the following industries and service conditions, drawing on the material’s core strengths:

• Sulphuric Acid: Concentrated and dilute sulphuric-acid process equipment.
• Flue-Gas Desulphurisation: Scrubbers and absorbers.
• Chemical Processing: Phosphoric-acid and mixed-acid systems.
• Seawater: High-chloride and brine service.

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.

6. Manufacturing, Inspection and Quality Assurance

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.

• Material Test Certificates (MTC): Provided strictly as per EN 10204 3.1 / EN 10204 3.2.
• Non-Destructive Testing (NDT): Positive Material Identification (PMI), Visual Inspection, Dimensional Checks, and Micro/Macro testing.
• Destructive Testing: Tensile tests, hardness testing, chemical analysis, and (where applicable) intergranular corrosion (IGC) tests.

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.

7. Standards and Technical References

This datasheet references DIN 125 for dimensional requirements and ASTM B649 for material and fastener requirements. The applicable standard edition and purchase requirements should be confirmed for every project.

For DIN standards information, see the DIN 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.

8. Frequently Asked Questions

What is a Alloy 3127 hMo Flat Washer?

A Alloy 3127 hMo Flat Washer is a plain load-distribution washer manufactured from Alloy 3127 hMo (UNS N08031). The product combines the DIN 125 dimensional geometry with the ASTM B649 material and fastener requirements.

What standard is used for the Alloy 3127 hMo Flat Washer dimensions?

The dimensional information in this datasheet is based on DIN 125, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the Alloy 3127 hMo product range.

What is the material designation of Alloy 3127 hMo?

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 –, –.

Is Alloy 3127 hMo suitable for corrosive or demanding service?

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.

Can Ananka Fasteners supply custom Alloy 3127 hMo Flat Washers?

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.

9. Request a Alloy 3127 hMo Flat Washer Quote

Need a Alloy 3127 hMo 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: Alloy 3127 hMo / UNS N08031, nominal size, DIN 125 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.