2. Product Features
Super corrosion resistance: 316L medical grade stainless steel is selected, and the special alloy composition containing molybdenum element enables it to effectively resist the erosion of disinfectants, acid and alkali solutions and human body fluids in the medical environment, avoid rust and damage of parts, and ensure long-term stable use in complex medical scenarios.
High precision and stability: Using five-axis linkage CNC machining technology, the straightness of the shaft is controlled within 0.01mm/m, the diameter tolerance is ±0.003mm, and the surface roughness is Ra≤0.2μm. Precise dimensional accuracy and smooth surface achieve close cooperation with other parts of the equipment to ensure that the equipment runs without shaking and deviation.
High strength and fatigue resistance: After special forging and heat treatment process, the tensile strength of the parts reaches more than 700MPa, and the yield strength exceeds 500MPa. In high-frequency and long-term use, it can still maintain good structural strength and fatigue resistance, reducing equipment maintenance costs.

Biosafety: Strictly following ISO 10993 biosafety standards, the material is non-toxic and harmless, and has no adverse reactions when in contact with human tissue. It can be safely used in medical devices that directly contact patients, such as syringe plungers, rotating shafts of rehabilitation equipment, etc.

Test items	Testing standards	Significance of testing
Material composition	Meet 316L medical stainless steel standards	Ensure biological safety and corrosion resistance
Tensile strength	≥700MPa	Guarantee high-intensity use requirements
Straightness	Within 0.01mm/m	Ensure transmission stability
Surface roughness	Ra≤0.2μm	Reduce the risk of bacterial attachment

3. Product Details
Material and process: The core material is 316L medical stainless steel, and the purity of the material is improved by vacuum melting. During production, it is first hot forged to optimize the internal grain structure of the metal and enhance the mechanical properties; then fine grinding is performed using a high-precision CNC grinder to ensure the accuracy of the shaft size; finally, the electrolytic polishing process is used to make the surface as smooth as a mirror, and passivation treatment is performed to further enhance the corrosion resistance.
Specifications and customization: A variety of specifications are provided with diameters of 2mm - 30mm and lengths of 50mm - 1000mm to meet the requirements of different medical devices for shaft length and diameter. Customized services are supported, and the shape of the two ends of the shaft, dimensional accuracy, surface treatment method, etc. can be adjusted according to the special installation requirements and transmission parameters of the customer's equipment to adapt to personalized medical equipment design.
Application scenarios: In the field of surgical instruments, it serves as the drive shaft of electric scalpels and ultrasonic scalpels to achieve precise power transmission and assist doctors in fine operations; in medical imaging equipment, it is used for the mechanical arm rotation axis and examination bed movement axis of CT and MRI equipment to ensure precise operation and positioning of the equipment; in rehabilitation training equipment, it serves as the joint activity axis and training equipment drive shaft to assist patients in safe and effective rehabilitation training.