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Help CenterASTM 303 Square Bar, 20mm Side, Polished, Sharp Corners, Excellent Threading, for Terminal Blocks and Clamp Fasteners
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What Is Stainless Steel Bar？
Product Definition：
Stainless steel bars are long, solid products manufactured from stainless steel billets through hot rolling, cold drawing, or forging processes. They serve as semi-finished materials for machining, fabrication, and construction applications, combining high strength, excellent corrosion resistance, and good machinability.
Key Characteristics：
| Feature | Description |
|---|---|
| Corrosion Resistance | Excellent resistance to rust, pitting, and chemical attack – grade dependent |
| High Strength | Good mechanical properties with moderate weight |
| Machinability | Free-machining grades (303, 416) available for high-volume production |
| Heat Treatable | Martensitic (410, 420) and PH (17-4PH) grades can be heat treated for higher hardness |
| Weldability | Austenitic grades (304, 316) offer excellent weldability |
| Dimensional Accuracy | Cold drawn and ground bars achieve tight tolerances (h9/h11/h6) |
| Surface Quality | Multiple finishes – from black to mirror polished |
| 100% Recyclable | Environmentally friendly with no loss of properties |
Product Forms Overview：
| Shape | Description | Size Range | Best For |
|---|---|---|---|
| Round Bar | Cylindrical cross-section | Ø3 – Ø500 mm | Shafts, turned parts, general machining |
| Square Bar | Four equal sides | 3×3 – 200×200 mm | Structural, fasteners, tooling |
| Hex Bar | Six-sided, across-flats dimension | AF5 – AF100 mm | Bolts, nuts, fasteners, automatic lathe |
Typical Applications by Industry：
| Industry | Applications | Recommended Grades |
|---|---|---|
| General Machining | Shafts, pins, bushings, turned components | 304, 316, 416 (free-machining) |
| Fastener Manufacturing | Bolts, nuts, set screws, studs, threaded rods | 304, 316, 17-4PH, 410 |
| Valve & Pump | Valve stems, pump shafts, ball valve components | 316, 17-4PH, 410 |
| Automotive | Engine components, transmission shafts, suspension parts | 304, 410, 416, 17-4PH |
| Marine / Offshore | Boat shafts, propeller shafts, seawater valves | 316L, 2205 |
| Chemical / Pharmaceutical | Agitator shafts, mixer components, pump parts | 316L, 904L |
| Aerospace | Landing gear components, engine mounts, structural fasteners | 17-4PH, 321 |
| Construction | Handrails, balustrades, structural supports | 304, 316L |
| Food Processing | Mixer shafts, conveyor rollers, sanitary fittings | 304L, 316L |
| Medical | Surgical instruments, dental tools | 304, 316L, 17-4PH, 420 |
Key Specifications – Round / Square / Hex Bar
| Parameter | Round Bar | Square Bar | Hex Bar |
|---|---|---|---|
| Standards | ASTM A276, A479, A484 | ASTM A276, A484 | ASTM A276, A484 |
| Size Range | Ø3 – Ø500 mm | 3×3 – 200×200 mm | AF5 – AF100 mm |
| Length | 3m / 6m / 12m, or custom cut | 3m / 6m / 12m, or custom cut | 3m / 6m / 12m, or custom cut |
| Surface Finish | Black, pickled, bright drawn, peeled, ground, polished | Black, pickled, bright drawn, polished | Bright drawn (standard), polished |
| Diameter / AF Tolerance | h9 / h11 / h6 | h9 / h11 | h9 / h11 |
| Straightness | ≤1.0 mm/m (standard); ≤0.5 mm/m (precision) | ≤1.0 mm/m | ≤1.0 mm/m |
| Twist | N/A | ≤1.0 mm/m | ≤1.0 mm/m |
| Corner Condition | N/A | Rounded or sharp | Slightly rounded (standard) |
Wuxi Yansheng Technology Co., Ltd. – Company Profile
Wuxi Yansheng Technology Co., Ltd. is a comprehensive technology enterprise specializing in high-quality metal raw material supply and precision processing services. Located in Wuxi City, a major steel distribution center in China, the company leverages the mature industrial chain advantages of the Yangtze River Delta region to provide professional material solutions to global customers.
As a technology-driven enterprise, Yansheng Tech maintains strategic cooperation with several well-known steel mills (such as TISCO, Baosteel, JISCO, Dongfang Special Steel, etc.) and is an authorized distributor of these mills. Our main products include stainless steel (304/316/BA/EP pipe), carbon steel, silicon steel, copper, aluminum and other materials in the form of sheets, pipes, coils, as well as custom-processed parts.
Core Business Highlights:
Material Supply: We maintain sufficient stock inventory, offering 304/316 stainless steel sheets, pipes, coils, API 5L casing, electrical steel, and more. We also accept orders for special steel grades and non-standard specifications.
Precision Processing: Equipped with imported mirror polishing machines, water jet cutting machines, high-precision slitting/leveling lines, large CNC milling machines, boring machines, and more. We provide customized services including BA/EP pipe finishing, medium plate polishing, matte finishing, embossing, plasma cutting, etc.
Main Applications: Our products are widely used in industries such as solar energy, pressure vessels, boilers, electric heating equipment, petrochemicals, environmental protection machinery, pharmaceutical and food processing, and new energy vehicles.
Our processing center is located in Xishan District, Wuxi City, covering nearly 10,000 square meters, with an experienced technical and service team. We adhere to the business philosophy of "Technology First, Quality Oriented, Service Supreme" , providing 24/7 warehousing and logistics support as well as comprehensive after-sales service. Yansheng Tech is committed to being your trusted long-term partner.
Frequently Asked Questions (FAQ)
Q1. What products do you mainly supply?
We mainly supply stainless steel (304/316/BA/EP pipes), carbon steel, silicon steel, copper, aluminum, and other materials in sheets, pipes, and coils. Customized processing services are also available.
Q2. Do you have stock available?
Yes, we maintain sufficient stock for most standard specifications. For non-standard sizes, we can accept orders with reasonable lead time.
Q3. Can you provide MTC (Mill Test Certificate)?
Yes, we provide MTC for every shipment. Third-party inspection (SGS, TÜV, BV, etc.) is also available upon request.
Q4. Do you support video inspection before shipment?
Yes, we fully support video inspection. You can also arrange an agent or third party to visit our factory for on-site inspection before shipment.
Q5. What are your main export markets?
We export to Southeast Asia, the Middle East, Europe, Africa, and South America. We have rich experience in international trade and export documentation.
Q6. What payment terms do you accept?
We accept T/T (wire transfer), L/C at sight (irrevocable), and sometimes a combination of T/T deposit + L/C balance. Payment terms are negotiable based on order size and customer history.
Q7. Can you provide samples?
Yes, samples are available for most standard products. For custom sizes, we may need to produce small batch samples. Sample cost and shipping are usually borne by the customer, but can be discussed.
Q8. What is your typical lead time?
For stock items: 7–10 days after order confirmation. For custom production: 20–30 days, depending on the specification and quantity.
Q9. What quality certifications do you have?
We provide MTC with every shipment. Our partner mills are ISO9001 certified. We can also assist with third-party inspections (SGS, TÜV, BV) upon request.
Q10. How can I get a quotation?
Please send us your material grade, specification (size, thickness, length), quantity, and preferred trade term (FOB, CIF, DAP, etc.). We will reply with a detailed quotation within 24 hours.
Send Inquiry to This Supplier
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