At Ananka Fasteners Pvt Ltd we manufacture and supply premium SS 303 (UNS S30300) fasteners across the complete range of bolts, nuts, studs, screws and washers. Sulphur-modified 18/8 austenitic – machines like brass, corrosion resistance close to 304. This page consolidates the chemistry, mechanical properties, equivalent grades and product forms available in this alloy, together with the ASTM specifications that govern each product form.
Ananka supplies the complete family of standard-fastener geometries in this grade. Each product form is manufactured to its own dedicated dimensional standard and material specification, listed below.
| Material Grade | SS 303 (UNS S30300) | Material Category | Free-Machining Austenitic Stainless |
| Fastener Bolting Spec | ASTM F593 Group 1 | Fastener Nut Spec | ASTM F594 Group 1 |
| Raw Material Standard | ASTM A582 (free-machining bar) | Thread Standard | ASME B1.1 (UNC/UNF), ISO 261 (Metric) |
| Product Forms Available | Bolts, Nuts, Studs, Screws, Washers – inch and metric | Standard Certifications | EN 10204 3.1 / 3.2, PMI, MTC |
| US / UNS | Werkstoff Nr. (DIN) | European (EN) | British Standard (BS) | Other / AFNOR |
|---|---|---|---|---|
| S30300 | 1.4305 | X8CrNiS18-9 | 303 S31 | Z8 CNF 18-09 (AFNOR) |
| 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 |
The following fastener geometries are stocked or made-to-order in SS 303:
| Hex Bolt | Available | Heavy Hex Bolt | Available |
| Hex Bolt (Partial Thread) DIN 931 | Available | Hex Bolt (Full Thread) DIN 933 | Available |
| Hex Bolt ISO 4014 | Available | Hex Bolt (Precision) BS 3692 | Available |
| Stud Bolt (Threaded Both Ends) ASME B16.5 | Available | Threaded Rod / Stud DIN 976 | Available |
| Socket Head Cap Screw ASME B18.3 | Available | Socket Head Cap Screw DIN 912 | Available |
| Hex Nut ASME B18.2.2 | Available | Heavy Hex Nut ASME B18.2.2 | Available |
| Hex Nut DIN 934 | Available | Hex Nut ISO 4032 | Available |
| Flat Washer ASME B18.22.1 | Available | Flat Washer DIN 125 | Available |
Selected uses of SS 303 fasteners drawn from the alloy’s core strengths:
Every batch produced in this grade undergoes internal and third-party testing to ensure zero-defect delivery, with complete traceability shipped worldwide.
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.
SS 303 fasteners manufactured by Ananka are released to ASTM F593 Group 1 for bolting products and ASTM F594 Group 1 for nuts, with raw material supplied to ASTM A582 (free-machining bar). The applicable standard edition and purchase requirements should be confirmed for every project.
For ASTM International material and fastener specifications, see the ASTM International standards catalogue. This external reference is provided for standards identification; the purchaser should verify the current edition applicable to the order.
Ananka Fasteners supplies SS 303 (UNS S30300) in Bolts, Nuts, Studs, Screws, Washers – inch and metric.
SS 303 is identified as UNS S30300. The equivalent designations across DIN, EN, British Standard and AFNOR nomenclature are listed in the Equivalent Grades table above.
Bolting products in SS 303 are released to ASTM F593 Group 1, and nuts are released to ASTM F594 Group 1. Raw material chemistry and mechanicals are governed by ASTM A582 (free-machining bar).
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.
Yes. For a quotation, provide the required fastener type, nominal size, dimensional standard, quantity and any inspection or certificate requirements.
Need SS 303 bolts, nuts, studs, screws or washers for an industrial project? Send the required fastener type, 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, fastener type, nominal size, dimensional standard, quantity, inspection requirements and EN 10204 certificate requirements where applicable.
