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Stainless steel internal and external threaded connector with precision CNC screws
Medical Device Industry
Application Scenarios
Mainly used in Class III medical devices, including connecting screws for surgical instruments (such as laparoscopes and orthopedic surgical instruments), fasteners for orthopedic implants (e.g., artificial joints, fracture fixation plates) and dental implants (e.g., dental implant abutments), as well as fixing screws for precision components in medical equipment enclosures (e.g., MRI machines, hematology analyzers), endoscopes, etc.
These fasteners are in direct contact with the human body or used in core medical equipment, requiring extremely high biocompatibility, precision, and cleanliness.
Core Production Characteristics
Biocompatible Material Selection
Priority is given to materials with excellent biocompatibility, such as medical-grade titanium alloy (e.g., Ti-6Al-4V) and 316L stainless steel. These materials are non-toxic, non-sensitizing, well-tolerated by human tissue, and have outstanding corrosion resistance (withstanding human body fluids and disinfectants).
Strict purity testing of raw materials is required during production to eliminate harmful impurities. Surface polishing, passivation, and other processes are applied to further enhance biocompatibility.
Micron-level Precision and Surface Quality Control
Dimensional tolerances reach the micron level; some micro screws have tolerances controlled at ±0.001~±0.003 mm. Surface finish must meet Ra ≤ 0.8 μm, free of burrs and scratches to avoid damaging human tissue or harboring bacteria.
High-precision micro-machining equipment and ultra-precision measuring instruments (e.g., laser measuring devices) are used. Processing techniques are optimized to reduce surface defects and ensure compliance with precision and surface quality standards.
Miniaturization and Structural Optimization
Extensive use of micro screws below M1, as well as headless, semi-countersunk, hexagon socket, and other designs to fit narrow installation spaces in medical devices. Anti-loosening structures (e.g., anti-slip threads, locking grooves) are designed to prevent loosening during surgery or equipment operation.
Implantable fasteners feature an edge-free design for easy insertion and removal, with optimized thread geometry to improve fixation stability.
Compliance and Cleanliness Control
Strictly follow the ISO 13485 medical device quality management system. Production environments must meet cleanroom standards (e.g., Class 10,000, Class 100,000) to avoid product contamination.
Production processes include deburring, ultrasonic cleaning, and sterile packaging to ensure products are impurity-free and sterilizable (withstanding autoclaving, UV sterilization, etc.). A complete quality inspection system is established, with each batch undergoing biocompatibility testing, precision testing, and sterility testing.
General Core Characteristics of CNC Machined Screws
Ultra-high precision: Standard tolerance ±0.01 mm, precision versions up to ±0.001 mm, with precise, gap-free thread matching.
High consistency: Program-controlled, ensuring uniform dimensions, geometric form, and surface quality in mass production.
Flexible customization: No mold required, enabling fast switching for non-standard pitches, special heads, multi-step profiles, and unique slot types.
Wide material compatibility: Capable of machining stainless steel, titanium alloy, aluminum alloy, copper alloy, high-temperature alloy, etc.
Flexible efficiency & batch size: Suitable for small-batch prototyping and medium-batch customization, with fast switching between single parts and multi-variety production.
CNC Machined Screws vs. Traditional Screws (Thread Rolling / Cold Heading)
Comparison Item
CNC Machined Screws
Traditional Thread Rolling / Cold Heading Screws
Precision
Ultra-high (±0.001~±0.01 mm)
General (±0.05~±0.1 mm)
Customization
Extremely strong (non-standard / special / complex structures)
We have introduced advanced equipment and technology from Japan and Germany (CNC 5-axis and 6-axis machines) to better serve our customers' needs.
Our maximum processing outer diameter is 60, and the minimum control tolerance is 0.001. We have Japanese CNC Tsugami, CNC Citizen, multi-station cold extrusion forming machines, 500T press machines, casting equipment, and various process equipment, which can effectively provide customers with the best technical solutions.
Our company has a total of 300 employees, including 20 technicians, 10 engineers, and 15 quality control personnel. We have over 300 pieces of equipment.
Our company implements 8S management and has passed ISO9001 and TS16949 automotive certifications.
Our customers include , bo-sch, Foxconn, Motors, Husqvarna, Shimano, NVIDIA, DJI Drones, Siegenia, and Cater-pillar.