Chicago Screw Black Oxide

Key Features & Benefits
  • Resistencia a la corrosión – Black oxide provides moderate rust protection, ideal for indoor and mild outdoor use.
  • Aesthetic Appeal – Matte black finish offers a sleek, professional look for visible applications.
  • Reduced Glare – Non-reflective surface is preferred in optical, military, and automotive applications.
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El proceso de estampado en frío es uno de los nuevos procesos de mecanizado a presión de menor o ningún corte
metal. Es un método de transformación que utiliza la deformación plástica del metal bajo la acción de
fuerzas externas y, con ayuda de moldes, redistribuye y transfiere el volumen de metal para formar
las piezas o formatos necesarios. El proceso de estampación en frío es el más adecuado para producir piezas estándar.
elementos de fijación como pernos, tornillos, tuercas, remaches, pasadores, etc.

Definition & Composition:
Tornillo de Chicago Black Oxide are specialized two-piece fasteners consisting of:

  1. Male Screw Component – Featuring a flat countersunk head with black oxide coating

  2. Female Barrel Component – Threaded receiver with matching black oxide treatment

Manufacturing Process:
The black oxide coating is applied through a controlled chemical conversion process that:

  1. Cleans and prepares the steel surface

  2. Converts the top layer to magnetite (Fe₃O₄)

  3. Tornillo de Chicago

  4. Seals with oil or wax for enhanced protection

Performance Advantages:

  1. Enhanced Durability:

    • 30% better wear resistance vs. untreated steel

    • Reduced galling during assembly

    • Maintains dimensional accuracy (coating adds negligible thickness)

  2. Functional Benefits:

    • Reduced light reflection (85% less glare than bare metal)

    • Improved lubricity (coefficient of friction reduced by 15-20%)

    • Compatible with most thread locking compounds

Industry Applications:

  • Defense/Military: Weapon systems, night vision equipment

  • Automoción: Interior trim, dashboard assemblies

  • Electronics: Server racks, AV equipment

  • Médico: Diagnostic equipment housings

  • Industrial: Machinery guards, inspection panels

Installation Best Practices:

  1. Use torque values 10-15% lower than dry steel fasteners

  2. Apply thread lubricant for assemblies exceeding 1/4″ diameter

  3. Store in low-humidity environments when not in use

  4. Avoid mixing with dissimilar metals in corrosive environments

This comprehensive finishing solution combines functional performance with aesthetic appeal, making  Chicago screw Black Oxide ideal for applications where both technical performance and visual presentation are important considerations. The coating provides superior value compared to paint or powder coating for precision fastener applications.

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