Mechanical Properties
| Tensile strength (Rm) | Yield strength (Rp0.2) | Elongation (A5) | Reduction of Area (Z) | Hardness |
| ≥ 520 MPa | ≥ 205 MPa | ≥ 40% | ≥ 50% | ≤ 187 HBW; ≤ 90 HRBW; ≤ 200 HV |
Austenitic Stainless Steel Precision Ground Bars
303 Stainless Round Bar UNS S30300 | AISI 303
303 stainless steel precision ground bar is designed for customers who need excellent machinability, stable dimensional accuracy, and a smooth ground surface for high-volume precision machining. As a free-machining austenitic stainless steel, 303 contains sulfur and selenium additions that improve cutting performance and make the material easier to process on automatic lathes and CNC equipment.
Compass Power Tech manufactures 303 stainless steel precision ground bars for applications such as automatic lathe parts, precision components, hardware manufacturing, food equipment, automotive parts, and electronic products. The material is especially suitable for customers who need to reduce machining time, improve processing efficiency, and control production costs without sacrificing stainless steel performance.
For projects that require fast cutting, good surface finish, and consistent bar quality, 303 stainless steel precision ground bar offers a practical material choice for batch production and custom-machined parts.
Mechanical Properties & Chemical Composition
303 stainless round bars combine reliable machinability, stable surface quality and controlled chemical composition for precision shafting applications.
Chemical Composition (%)
| Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Others |
| 303 (S30300) | ≤ 0.15 | ≤ 1.00 | ≤ 2.00 | ≤ 0.20 | ≥ 0.15 | 8.00–10.00 | 17.00–19.00 | ≤ 0.60 | - | - |
Specifications
| Diameter | Tolerance | Roundness | Straightness | Standard Length | Surface Roughness |
| |
≤0.1mm/m | g6, h6, f7 | ≤1/2 | 2m 3m | Ra≤0.4 |
| |
≤0.1mm/m | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
| |
≤0.1mm/m | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
| |
≤0.05mm/m | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
| |
≤0.05mm/m | g6, h6, f7 | ≤1/2 | 3m, 6m | Ra≤0.4 |
Additional Custom Services
- Cut-to-length service: Shaft length can be customized according to customer assembly requirements.
- End chamfering: Both ends of the shaft can be chamfered to simplify downstream machining and installation.
- Drawing-based machining: Shafts can be machined according to customer drawings and supplied as ready-to-assemble components.
- Surface rolling treatment: Surface rolling can be applied to improve surface hardness when higher wear resistance is required.
Packaging and Storage
To protect stainless steel precision ground shafting during sea freight and storage, Compass Power Tech uses anti-rust paper tube packaging. Before wrapping, anti-rust oil is applied evenly to the shaft surface, and anti-rust wax is applied inside the paper tube. This protection process helps reduce corrosion risk during transportation and ensures customers receive shafts in stable, ready-to-use condition.
Looking for Custom Metal Components for Your Application?
We manufacture precision ground shafts, stainless steel tubing, piston rods and aluminum alloy cylinder tubes for hydraulic, pneumatic, machinery, energy and transportation applications. Contact us for material selection, specifications and customization support.
