At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium SS 431 (UNS S43100) Hex Bolt (Partial Thread) built for demanding service. Nickel-bearing martensitic stainless combining high strength and toughness with good corrosion resistance for marine shafting. This technical datasheet covers the precise dimensional tolerances per DIN 931 and the material requirements dictated by ASTM F593 Group 4 and ASTM A276 / A479.
A SS 431 Hex Bolt with a partial thread leaves an unthreaded shank across the shear plane, which is preferred in joints designed to resist shear loading. 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 | SS 431 Hex Bolt (Partial Thread) | Material Category | Stainless Steel |
| Material Grade | SS 431 (UNS S43100) | Fastener Spec | ASTM F593 Group 4 |
| Dimension Spec | DIN 931 | Material Spec | ASTM A276 / A479 |
| Thread Standard | ISO 261 / ISO 965 (Metric Coarse) | Thread Tolerance | 6g / 4g6g |
The DIN 931 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. DIN 931 covers partially threaded hex bolts (shank plus thread).
| 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 |
An unthreaded body section is retained below the head, with threading provided only along the lower portion of the shank. Buyers should confirm the required nominal diameter, thread length, grip length and thread class against the purchase drawing or applicable standard before ordering.
The UNS S43100 Hex Bolt (Partial Thread) is manufactured from SS 431, a 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 |
|---|---|---|---|---|
| S43100 | 1.4057 | X17CrNi16-2 | 431 S29 | Z15 CN 16-02 (AFNOR) |
This section details the chemical composition limits and minimum mechanical properties governing SS 431 (UNS S43100) fasteners, as dictated by ASTM F593 Group 4 (chemistry & mechanicals) and the raw bar/rod standard ASTM A276 / A479.
| Element | Composition, % |
|---|---|
| Chromium | 15.0–17.0 |
| Nickel | 1.25–2.50 |
| Carbon, max | 0.20 |
| Manganese, max | 1.0 |
| Silicon, max | 1.0 |
| Phosphorus, max | 0.040 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Hardened & tempered bar | 125 000 (860) | 95 000 (655) | 15 | – |
Our SS 431 hex bolts are specified across the following industries and service conditions, drawing on the material’s core strengths:
For applications exposed to highly aggressive chemicals or chloride-rich environments, the exact operating conditions should be reviewed against the certified data for this grade rather than general stainless steel 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 DIN 931 for dimensional requirements and ASTM F593 Group 4 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.
A SS 431 Hex Bolt (Partial Thread) is a hex-head bolt with a partially threaded shank and an unthreaded body section manufactured from SS 431 (UNS S43100). The product combines the DIN 931 dimensional geometry with the ASTM F593 Group 4 material and fastener requirements.
The dimensional information in this datasheet is based on DIN 931, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the SS 431 product range.
SS 431 is identified as UNS S43100. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4057, EN X17CrNi16-2, British Standard 431 S29, Z15 CN 16-02 (AFNOR).
SS 431 is a stainless steel known for good general corrosion resistance and wide industrial availability. For applications exposed to highly aggressive chemicals or chloride-rich environments, the exact operating conditions should be reviewed against the certified data for this grade rather than general stainless steel 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 SS 431 Hex Bolt (Partial Thread) 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: SS 431 / UNS S43100, nominal size, DIN 931 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
