Chicago Screw Black Oxide

冷镦加工是一种少切削或无切削的压力加工新工艺
金屬。它是一種利用金屬在下列因素作用下產生塑性變形的加工方法
外力作用下，在模具的幫助下，重新分配和轉移金屬的體積，以形成
所需的零件或坯料。冷镦工艺最适合生产标准的
螺栓、螺絲、螺帽、鉚釘和銷等緊固件

Definition & Composition:
芝加哥螺絲 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. 芝加哥螺絲

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

• 汽車: Interior trim, dashboard assemblies

• Electronics: Server racks, AV equipment

• 醫療: Diagnostic equipment housings

• 工業級: 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.