Slotted Chicago Screws

عملية الرأس على البارد هي واحدة من العمليات الجديدة للتشغيل الآلي بالضغط ذات القطع الأقل أو بدون قطع
المعدن. وهي طريقة معالجة تستخدم التشوه البلاستيكي للمعدن تحت تأثير
قوى خارجية، وبمساعدة القوالب، تقوم بإعادة توزيع ونقل حجم المعدن لتشكيل
الأجزاء أو الفراغات المطلوبة. عملية الخراطة على البارد هي الأكثر ملاءمة لإنتاج الأجزاء القياسية
أدوات التثبيت مثل البراغي والبراغي والصواميل والمسامير والمسامير والدبابيس وغيرها

1. Fundamental Definition

Slotted Chicago screws (commonly called sex bolts أو 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

• مقاومة الاهتزازات: 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

• صناعي: 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.