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Welcome to Wuxi Yansheng Technology Co., Ltd. – a trusted manufacturer established in 2017 with a factory area of 1,000–3,000 square meters and an annual export value exceeding US$50 million. Our Bright Finish ASTM 303 Stainless Round Bar is engineered for precision mechanical components, offering exceptional dimensional stability and a mirror-like surface finish. With over 101–200 skilled employees and a robust quality management system, we ensure every bar meets the highest standards of consistency and reliability.
This product is specifically designed for applications where tight tolerances and corrosion resistance are critical. The ASTM 303 grade provides excellent machinability, while the bright finish eliminates the need for secondary processing, saving time and cost. Whether you are manufacturing shafts, fittings, or precision fasteners, our round bar delivers stable dimensions across long lengths, reducing waste and improving production efficiency.
Key Features & Technical Specifications
Material: Austenitic stainless steel 303 (UNS S30300) – optimized for free machining.
Surface Finish: Bright, smooth, and scale-free – ideal for aesthetic and functional parts.
Dimensional Stability: Consistent diameter and straightness within h9/h11 tolerance range.
Corrosion Resistance: Good resistance to mild corrosive environments, suitable for general industrial use.
Machinability: Exceptionally high cutting speeds and low tool wear; perfect for automatic screw machines.
Customization: Available in various diameters (1mm–200mm), lengths, and cut-to-size options.
Packaging: Securely packed with protective coating to prevent scratches during transit.
| Parameter | Specification |
|---|---|
| Alloy | ASTM 303 (S30300) |
| Condition | Bright Annealed / Cold Drawn |
| Diameter Tolerance | ±0.05mm (for diameters ≤ 20mm); ±0.10mm (for larger sizes) |
| Straightness | ≤ 1mm/m |
| Surface Roughness | Ra ≤ 0.8μm (bright finish) |
| Tensile Strength | ≥ 620 MPa (typical) |
| Yield Strength | ≥ 260 MPa |
| Elongation | ≥ 40% |
| Hardness (HRB) | ≤ 100 |
Customer Benefits
Reduced Machining Time: The bright finish and free-machining properties enable faster cutting speeds, boosting productivity by up to 30%.
Cost Savings: No need for additional surface finishing; the stable dimension minimizes scrap and rework.
Consistent Quality: Every batch is tested for chemical composition, mechanical properties, and dimensional accuracy.
Versatile Applications: Ideal for precision components in automotive, medical devices, instrumentation, and general engineering.
Reliable Supply: With multiple ports (Tianjin, Shanghai, Qingdao, Ningbo) and a dedicated export team, we ensure timely delivery worldwide.
Trust & Credibility
Wuxi Yansheng Technology Co., Ltd. holds multiple certifications including ISO9001, HACCP, SA8000, OHSAS18001, TL900, QS9000, ISO14000, ISO16949, and others, reflecting our commitment to quality, safety, and social responsibility. Our factory spans 1,000–3,000 square meters with advanced production lines and in-house testing equipment. We have served customers across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East, with an annual export value of US$50 million–US$100 million. Choose Yansheng for precision, stability, and professionalism – contact us today for a quote or sample.
Frequently Asked Questions
Q: What is the typical diameter tolerance for your bright finish round bar?
A: We offer h9 tolerance as standard, with h11 available for larger diameters. Custom tolerances can be arranged upon request.Q: Can the bar be supplied in cut-to-length sizes?
A: Yes, we can cut to any length from 1m to 6m, or as per your specification. Contact our sales team for details.Q: Is the bright finish suitable for food contact applications?
A: While ASTM 303 has good corrosion resistance, it is not specifically designed for food contact. For food-grade applications, we recommend 304 or 316 grades. Please consult our engineers.Q: What packaging do you use to protect the surface finish?
A: Each bar is individually wrapped with protective paper or plastic sleeves, then bundled with straps and placed in wooden crates for export. Anti-rust coating can be applied on request.Q: Do you provide material test certificates?
A: Yes, we provide a mill test certificate (MTC) per EN 10204 3.1 or 3.2 for every shipment, including chemical and mechanical data.Q: What is the minimum order quantity (MOQ)?
A: Our standard MOQ is 500 kg per size, but smaller quantities are available for sample orders. Please inquire.Q: Which ports do you ship from?
A: We ship from Tianjin, Shanghai, Qingdao, and Ningbo. Delivery time depends on destination and order quantity.Q: Can you produce non-standard diameters or lengths?
A: Absolutely. We have flexible production capabilities for custom sizes. Please provide your requirements for a tailored solution.
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