Stainless steel external hexagonal nuts - CNC precision machining by numerical control

Electronics / 3C / Telecommunications Industry

Application Scenarios

Core Production Characteristics

• Miniaturized Production Technology

   

  Mainly small-sized screws from M0.8 to M3, with some products only 2–5 mm in length. Miniaturized machining is required to solve difficulties such as positioning challenges and unstable machining accuracy for small-sized products.

   

  Micro cold heading machines and precision CNC lathes are used with dedicated micro-cutting tools, and machining parameters are optimized to ensure clear threads and accurate dimensions. Verticality and coaxiality are strictly controlled to avoid affecting the assembly accuracy of electronic devices.
   
• Lightweight and Functional Material Selection

   

  Lightweight materials including aluminum alloy, copper alloy, and titanium alloy are used to reduce the overall weight of equipment while meeting conductivity and heat conduction requirements based on application scenarios:
   
  • Copper alloy is used for PCB screws to improve conductivity.
  • Aluminum alloy is used for heat dissipation component screws to enhance thermal conductivity.
     
    Machinability of materials is optimized to prevent embrittlement and deformation, ensuring product strength meets assembly requirements.
   
• Structure Design for Assembly Compatibility

   

  Structures such as countersunk head, torx drive, cross recess, security drive, and ultra-thin head are widely adopted.
   
  • Countersunk and ultra-thin heads avoid protrusion and preserve appearance and hand feel.
  • Torx and security drives prevent disassembly by non-professionals and improve equipment safety.
     
    Slot dimensions are precisely machined for perfect screwdriver matching. Thread structures are optimized to improve assembly efficiency and avoid thread slipping.
   
• Optimized Surface Treatment Technology

   

  Different surface treatments are applied according to functional requirements:
   
  • Anodizing: Improves wear resistance and appearance of aluminum alloy screws.
  • Nickel plating: Enhances rust resistance and conductivity.
  • Gold plating: Improves conductivity and corrosion resistance for high-frequency telecommunications equipment.
     
    Coating thickness and uniformity are controlled to prevent peeling and oxidation. All surface treatments comply with environmental standards for electronic devices, such as RoHS.
   

General Core Characteristics of CNC Machined Screws

• Ultra-high precision: Normal tolerance ±0.01 mm, precision version up to ±0.001 mm, with precise, gap-free thread matching.
• High consistency: Program-controlled, with high uniformity in 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 shafts, and special drive 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, supporting single-piece and multi-variety fast switching.

Comparison: CNC Machined Screws vs. Traditional Screws (Thread Rolling / Cold Heading)