Stainless steel internal and external threaded connector with precision CNC screws

Medical Device Industry

Application Scenarios

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)