At Ananka Fasteners Pvt Ltd, we engineer, manufacture, and supply premium SS 303 (UNS S30300) Socket Head Cap Screw built for demanding service. Free-machining austenitic with added sulphur for high-speed machining; not intended for corrosive service. This technical datasheet covers the precise dimensional tolerances per DIN 912 and the material requirements dictated by ASTM F593 Group 1 and ASTM A582.
A SS 303 Socket Screw uses an internal hexagonal drive and is suitable for assemblies where a compact socket-head design is preferred. The tables below provide the principal dimensions, equivalent material grades, chemical composition and mechanical properties covered by the technical data for this product.
Our socket head cap screws are manufactured in standard and custom configurations, ensuring a precise fit for demanding structural, piping, and chemical-process applications.
| Product Name | SS 303 Socket Head Cap Screw | Material Category | Stainless Steel |
| Material Grade | SS 303 (UNS S30300) | Fastener Spec | ASTM F593 Group 1 |
| Dimension Spec | DIN 912 | Material Spec | ASTM A582 |
| Thread Standard | ISO 261 / ISO 965 (Metric Coarse) | Thread Tolerance | 6g / 4g6g |
The DIN 912 specification governs the physical geometry of this product. The tolerances below ensure a secure, reliable mate under service loads. DIN 912 governs metric socket head cap screws driven by an internal hex key.
| Nominal Thread (d) | Pitch (mm) | Head Diameter dk (Max, mm) | Head Height k (Max, mm) | Hex Key s (mm) |
|---|---|---|---|---|
| M6 | 1.0 | 10.00 | 6.0 | 5.0 |
| M8 | 1.25 | 13.00 | 8.0 | 6.0 |
| M10 | 1.5 | 16.00 | 10.0 | 8.0 |
| M12 | 1.75 | 18.00 | 12.0 | 10.0 |
| M16 | 2.0 | 24.00 | 16.0 | 14.0 |
| M20 | 2.5 | 30.00 | 20.0 | 17.0 |
| M24 | 3.0 | 36.00 | 24.0 | 19.0 |
The socket head design provides an internal hexagonal drive for assembly with an appropriate Allen or hex key. Buyers should confirm the required nominal diameter, thread series, length and socket size against the purchase drawing or applicable standard before ordering.
The UNS S30300 Socket Head Cap Screw is manufactured from SS 303, 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 |
|---|---|---|---|---|
| S30300 | 1.4305 | X8CrNiS18-9 | 303 S31 | Z8 CNF 18-09 (AFNOR) |
This section details the chemical composition limits and minimum mechanical properties governing SS 303 (UNS S30300) fasteners, as dictated by ASTM F593 Group 1 (chemistry & mechanicals) and the raw bar/rod standard ASTM A582.
| Element | Composition, % |
|---|---|
| Chromium | 17.0–19.0 |
| Nickel | 8.0–10.0 |
| Sulfur, min | 0.15 |
| Manganese, max | 2.0 |
| Carbon, max | 0.15 |
| Silicon, max | 1.0 |
| Phosphorus, max | 0.20 |
| Iron | Balance |
| Condition / Temper | Tensile Strength min, psi (MPa) | Yield Strength min, psi (MPa) | Elongation min, % | Hardness |
|---|---|---|---|---|
| Annealed / cold-drawn bar | 75 000 (515) | 30 000 (205) | 35 | 228 HB max |
Our SS 303 socket head cap screws 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 Socket Head Cap Screws 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 912 for dimensional requirements and ASTM F593 Group 1 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 303 Socket Head Cap Screw is an internally hex-driven cap screw manufactured from SS 303 (UNS S30300). The product combines the DIN 912 dimensional geometry with the ASTM F593 Group 1 material and fastener requirements.
The dimensional information in this datasheet is based on DIN 912, which governs the physical geometry of this product. The table above provides the principal dimensions listed for the SS 303 product range.
SS 303 is identified as UNS S30300. The equivalent designations listed in this datasheet include Werkstoff Nr. 1.4305, EN X8CrNiS18-9, British Standard 303 S31, Z8 CNF 18-09 (AFNOR).
SS 303 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 303 Socket Head Cap Screw 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 303 / UNS S30300, nominal size, DIN 912 requirement, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
