2. Product Features
Ultra-high precision matching: Using CNC grinding technology, the inner and outer diameters of the bushings are controlled at ±0.003mm, the cylindrical error is ≤0.002mm, and the surface roughness is Ra≤0.2μm. It can achieve micron-level precision matching with the shaft and hole components of medical equipment to ensure smooth and shaking movement of the equipment.
Excellent corrosion resistance: 316L stainless steel contains molybdenum alloy components, combined with passivation treatment technology, when facing sodium hypochlorite disinfectant, iodine tincture and human body fluids commonly seen in medical environments, it can form a dense oxide film, pass the 120-hour salt spray test, effectively avoid bushing corrosion and rust, and extend service life.
Self-lubrication and low friction: Some bushing surfaces are treated with special coatings (such as PTFE plating), and the friction coefficient is reduced to 0.05, which reduces the wear between the shaft and the bushing, reduces the noise of equipment operation, and reduces the maintenance frequency. It is suitable for high-frequency use scenarios of medical equipment.

Biosafe and reliable: Strictly following the ISO 10993 biosafety standard, the material is non-toxic and non-cytotoxic, safe in contact with human tissue, and can be safely used in medical devices that directly contact patients, such as joint bushings for rehabilitation equipment and transmission bushings for surgical instruments.

Test items	Testing standards	Significance of testing
Dimensional accuracy	Inner diameter / outer diameter ±0.003mm	Ensure precise matching with components
Cylindricity	≤0.002mm	Ensure the stability of equipment movement
Surface roughness	Ra≤0.2μm	Reduce the risk of friction and bacterial adhesion
Corrosion resistance	Passed 120-hour salt spray test	Adapt to complex medical environments
Biocompatibility	Complies with ISO 10993 standards	Ensure safety of human contact

3. Product Details
Material and process: 316L medical grade stainless steel is selected and vacuum smelted to improve purity. During production, it is first rough-formed by CNC lathe, and then fine-ground by high-precision internal and external cylindrical grinder to ensure accurate size. The surface treatment adopts electrolytic polishing process to improve the finish, and passivation treatment is performed to enhance corrosion resistance; for special needs, PTFE plating, nitriding and other surface treatments can be provided to optimize friction performance.
Specifications and customization: Provide standard specification products, inner diameter range 1mm - 50mm, outer diameter range 3mm - 52mm, length 5mm - 200mm. At the same time, it supports customized services, and can adjust the inner diameter, outer diameter, and length dimensions according to the special needs of customers' medical equipment, and customize special surface treatment processes and tolerance grades to meet personalized design and manufacturing requirements.
Application scenarios: In the field of surgical instruments, as joint bushings for surgical forceps and needle holders, they ensure that the opening and closing of instruments are flexible and the positioning is accurate; in medical imaging equipment, they are used for the rotating joints of the mechanical arms of CT and MRI equipment and the sliding parts of the examination bed to ensure that the equipment runs smoothly without deviation. In rehabilitation training equipment, as bushings for the movable parts of the joints, they reduce friction and assist patients in safe and comfortable rehabilitation training.
Service system: Equipped with a professional technical team, we provide one-stop services from product selection, technical consultation to installation and commissioning, and after-sales maintenance. Strictly follow the quality management specifications for medical device production, and conduct multiple quality inspection processes such as three-coordinate measuring instrument testing, hardness testing, and metallographic analysis on each batch of products. Establish a rapid response mechanism to respond to customer needs within 24 hours, promptly solve problems during use, and escort the stable operation of medical equipment.