316L Stainless Steel Precision Ground Bar for Small Shafts in Precision Instruments
In the world of precision machining, material stability determines product performance. 316L stainless steel precision ground bars are widely used in manufacturing small shafts, instrument components, and micro-mechanical parts that demand high dimensional accuracy and surface integrity.
316L stainless steel, a low-carbon version of 316, offers excellent corrosion resistance, weldability, and stability under harsh environments, making it ideal for precision components exposed to moisture, chemicals, or fluctuating temperatures.
At Tongyi Metal, each 316L precision ground bar undergoes fine grinding and stress relief to ensure consistent performance in automated turning centers, Swiss-type lathes, and CNC machining systems. Dimensional accuracy is tightly controlled, typically within ±0.01mm, with mirror-like surface finish up to Ra≤0.2μm.
| Property | 316L Stainless Steel | Regular 316 | Carbon Steel |
|---|---|---|---|
| Composition | Fe–Cr–Ni–Mo (low C ≤ 0.03%) | Fe–Cr–Ni–Mo | Fe–C |
| Corrosion Resistance | Excellent, even in chloride environments | Good | Poor |
| Hardness (HRB) | 70–85 | 75–90 | 90–100 |
| Machinability | Smooth, stable chip formation | Moderate | Rough, higher tool wear |
| Applications | Small shafts, precision bearings, medical devices | Fasteners, piping | Structural parts |
Why choose Tongyi Metal 316L precision bars?
Our bars are manufactured from large mill-certified billets, followed by centerless grinding, straightness correction, and stress relief annealing. This ensures uniform hardness, fine grain structure, and excellent straightness (≤0.2mm/m) — preventing vibration or deviation during high-speed machining.
In applications like optical instruments, precision measuring tools, and miniature motors, even a slight tolerance deviation can affect assembly fit and rotational balance. 316L’s mechanical stability and corrosion resistance ensure long-term performance and dimensional reliability.
Key Features:
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Diameter range: 3–50mm
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Tolerance: ±0.005–0.01mm
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Hardness: HRB70–85
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Surface roughness: Ra≤0.2μm
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Heat treatment: full annealing + stress relief
For manufacturers seeking stable, high-precision stainless steel bars for delicate machining tasks, 316L remains one of the most dependable materials. Tongyi Metal’s process control ensures every bar performs consistently from batch to batch — helping your parts meet the most demanding precision standards.
