Slotted Chicago Screws

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.

1. Fundamental Definition

Slotted Chicago screws (commonly called sex bolts ou binding barrels) are specialized two-piece fasteners designed for secure, flush-mounted assemblies. These mechanical fasteners consist of two interlocking components:

• Male screw: Features a slotted drive head and external machine threads

• Female barrel: Contains internal threads and an external flange for load distribution

2. Key Characteristics

• Reversible Assembly: Allows repeated disassembly without material damage

• Flush Mount Capability: Countersunk heads sit nearly flush with surfaces

• Resistência à vibração: Threaded connection resists self-loosening

• Material-Friendly: Eliminates compression damage common with rivets

4. Mechanical Properties

• Tensile Strength: 45,000-70,000 psi (carbon steel)

• Shear Strength: ~60% of tensile strength

• Torque Capacity: 4-25 in-lbs depending on size

• Temperature Range: -20°F to +250°F (untreated steel)

5. Functional Advantages

• Precision Tension Control: Adjustable tightness

• Clean Aesthetics: Low-profile installation

• Material Versatility: Compatible with leather, wood, plastics, composites

• Serviceability: Facilitates maintenance access

6. Industry Applications

• Leathercraft: Holsters, belts, saddles

• Woodworking: Furniture, cabinets, displays

• Industrial: Equipment panels, signage

• Commercial: Retail displays, sample cases

8. Quality Indicators

• Threads: Smooth engagement without cross-threading

• Flange: Flat bearing surface without burrs

• Slot: Centered, properly machined for driver engagement

10. Maintenance Considerations

• Inspection: Annual check in high-vibration use

• Replacement: When threads show >30% wear

• Corrosion Prevention: Use plated/stainless versions in humid environments

12. Historical Context

First patented in the late 19th century for bookbinding applications, Slotted Chicago Screws have evolved into essential fasteners across multiple industries. Their simple yet effective design has remained largely unchanged for over 100 years, demonstrating exceptional functional longevity.