Chicago Screw Black Oxide

冷間圧造加工は、切削の少ない、あるいは切削を必要としない新しい圧造加工のひとつである。
金属。の作用による金属の塑性変形を利用した加工法である。
外力を受け、金型の助けを借りて、金属の体積を再分配し、移動させる。
必要な部品やブランクを製造します。冷間圧造工程は、標準的な
ボルト、ネジ、ナット、リベット、ピンなどの留め具。

Definition & Composition:
シカゴ・スクリュー 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. シカゴ・スクリュー

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

• 自動車: Interior trim, dashboard assemblies

• Electronics: Server racks, AV equipment

• Medical: Diagnostic equipment housings

• インダストリアル: 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.