Shear bolts black oxide

O processo de encabeçamento a frio é um dos novos processos para a maquinagem sob pressão com menos ou nenhum corte
metal. É um método de processamento que utiliza a deformação plástica do metal sob a ação de
forças externas e, com a ajuda de moldes, redistribui e transfere o volume de metal para formar
as peças ou os espaços em branco necessários. O processo de encabeçamento a frio é o mais adequado para a produção de
elementos de fixação, tais como cavilhas, parafusos, porcas, rebites, cavilhas, etc.

A Shear Bolt with Black Oxide coating is a specialized fastener designed to fail under excessive torque or load, thereby protecting more critical components in a mechanical system. Here’s a detailed description:

1. Material & Construction

• Typically made from medium-carbon steel or alloy steel for strength.

• Heat-treated to achieve a precise shear strength.

2. Black Oxide Coating

• Process: The bolt undergoes a chemical conversion coating (black oxide) that creates a magnetite (Fe₃O₄) layer on the surface.

• Aparência: Matte black finish.

• Benefits:

  • Resistência à corrosão: Improved rust protection compared to bare steel (though not as robust as zinc plating).

  • Reduced Friction: Smoother surface aids in torque consistency.

  • Aesthetic & Low Reflectivity: Useful in applications where glare or visibility must be minimized.

3. Shear Bolt Design Features

• Precision Shear Point: Engineered to break at a specific torque threshold.

• Estilos de cabeça: Hex, socket, or specialty heads (depending on application).

• Threads: May be fully or partially threaded, with tight tolerances.

4. Aplicações comuns

• Máquinas agrícolas (e.g., tractor PTO shafts).

• Snowblowers & Rotary Cutters (protects drivelines).

• Industrial Gearboxes & Conveyors.

• Aerospace & Automotive Safety Systems.

5. Advantages of Black Oxide Shear Bolts

• Controlled Failure: Sacrificial protection for expensive equipment.

• Rentável: Black oxide is cheaper than many other coatings.

• Dimensional Stability: Coating adds minimal thickness, ensuring fit in tight tolerances.

6. Limitations

• Moderate Corrosion Resistance: Not ideal for highly corrosive environments (e.g., marine applications) unless supplemented with oil or wax.

• Shear Strength Variability: Proper torque calibration is critical.

Alternatives

• Shear Pins (unthreaded, easier to replace).

• Zinc-Plated or Stainless Steel Shear Bolts (for harsher environments).