2. Product Features
High-precision thread transmission: Using advanced CNC turning and grinding technology, the thread accuracy reaches ISO 4H level, and the pitch error is controlled within ±0.005mm, ensuring smooth transmission and no risk of slipping when matching with the nut, and realizing precise operation of medical equipment such as syringe piston adjustment and testing instrument parameter fine-tuning.
Excellent corrosion resistance: 316L stainless steel contains molybdenum. After passivation treatment, a dense oxide film is formed on the surface, which can effectively resist the erosion of common sodium hypochlorite disinfectants, iodine tinctures, human body fluids and other substances in the medical environment, avoid rust and jamming of the thread, and extend the service life of the parts.
High strength and stability: Through special forging and heat treatment processes, the tensile strength of the parts reaches more than 750MPa, and the yield strength exceeds 600MPa. In frequent tightening and adjustment operations, the structure can still be kept stable to prevent deformation from affecting the performance of the equipment.

Biosafe and reliable: Strictly following the ISO 10993 biosafety standard, the material is non-toxic, non-allergenic, and safe for contact with the human body. It can be safely used in medical devices that directly act on patients, such as adjustment screws for rehabilitation training equipment and fastening connectors for surgical instruments.

Test items	Testing standards	Significance of detection
Thread accuracy	ISO 4H grade	Ensure accurate and stable transmission
Pitch error	±0.005mm	Avoid transmission deviation
Tensile strength	≥750MPa	Guarantee high-intensity use requirements
Surface corrosion resistance	Passed 72-hour salt spray test	Adapt to complex medical environments
Biocompatibility	Complies with ISO 10993 standards	Ensure human contact safety

3. Product Details
Material and process: 316L medical grade stainless steel is selected, and the purity is improved by vacuum melting. During the production process, hot forging is first performed to optimize the internal structure, and then the thread is turned by a high-precision CNC lathe, and fine grinding is performed by a thread grinder. The surface treatment adopts electrolytic polishing and passivation process to reduce the surface roughness to Ra≤0.4μm, enhance the finish and corrosion resistance.
Specifications and customization: A variety of specifications are provided, with a thread diameter range of M2-M16 and a shaft length of 20mm-300mm to meet the needs of different medical equipment. Customized services are supported, and the thread type (such as metric thread, trapezoidal thread), accuracy level, shaft shape, surface treatment method, etc. can be adjusted according to customer requirements to meet the design and manufacturing of personalized medical equipment.
Application scenarios: In the field of surgical instruments, as the adjustment screw of surgical forceps and needle holders, precise clamping force control is achieved; in medical testing equipment, it is used for the fastening shaft of the centrifuge rotor and the sample rack adjustment shaft of the biochemical analyzer to ensure stable operation of the equipment. On rehabilitation training equipment, it serves as a joint angle adjustment screw and training equipment height adjustment shaft to assist patients in personalized rehabilitation training.
Service system: Equipped with a professional technical team, it provides one-stop services from product selection, technical consultation to installation and commissioning, and after-sales maintenance. Strictly follow the medical device production quality management specifications, and conduct multiple quality inspection processes such as thread gauge testing, hardness testing, and flaw detection for each batch of products. Establish a rapid response mechanism to promptly solve problems encountered by customers during use, and provide solid guarantees for the stable operation of medical equipment.