Custom Aluminum Connector Plate With Precision CNC & Enamel Printing | QIANXI Case Study

Project Background & Challenge
A European professional audio equipment brand came to QIANXI requiring a high-precision
connector plate for speaker back panels. The plate integrates multiple mounting holes and
connector interfaces, demanding strict dimensional accuracy and long-term durability.
Three key challenges were identified:

High-Density Hole Precision
Multiple holes with strict spacing (70mm symmetrical layout) required exact alignment - even
a slight deviation would cause connector misfit.
Premium Surface & Branding
The client wanted a matte black metal finish with high-contrast, wear-resistant markings that
look as good as they perform.

Industrial Durability
The plate must be scratch-resistant, corrosion-resistant, and maintain its appearance under
heavy professional use for years.
Our Engineering Solution
Phase 1: Material Optimization
We selected 5052/6061 aluminum alloy for its lightweight properties, excellent machinability,
and compatibility with anodizing - the ideal choice for professional audio hardware.
Phase 2: CNC Precision Machining
Using CNC drilling and laser cutting, all holes and contours were processed with ±0.15mm
tolerance. Every mounting point and connector interface was precisely positioned to ensure
perfect fit.
Phase 3: Surface Finishing
Sandblasting + anodizing created a matte black, anti-scratch, anti-fingerprint finish. The result
is a surface that looks and feels premium while standing up to demanding environments.
Phase 4: Enamel Printing
High-adhesion enamel ink was applied and thermally cured for maximum durability. Unlike
standard printing, enamel ink bonds to the anodized surface at a molecular level, ensuring the
markings won't fade, chip, or wear off - even after years of use.
Results & Performance
- ✅ Sample completed in 3 days
- ✅ Mass production finished in 20 days
- ✅ Precision tolerance: ±0.15mm
- ✅ Yield rate: >99.5%
Client Feedback
"The connector plates exceeded our expectations in precision and
finish. All connectors fit perfectly, and the printed details remain
sharp after repeated use."

FAQ
Q: What material is best for connector plates?
A: Aluminum (5052/6061) is ideal for its lightweight and machinability. It also takes anodizing
and enamel printing exceptionally well, making it the top choice for professional audio and
industrial applications.
Q: How do you ensure hole accuracy?
A: Through CNC machining, we maintain tolerance within ±0.15mm. Each hole position is
verified against the engineering drawing before production.
Q: Is enamel printing durable?
A: Absolutely. With thermal curing, enamel printing resists wear, scratching, and fading far
better than standard screen printing or UV printing. It's the preferred choice for products that
demand long-term legibility.
About QIANXI
QIANXI is a professional manufacturer specializing in custom metal nameplates, signs, and
identification products. From precision CNC machining to enamel printing and laser engraving,
we deliver high-quality metal solutions for brands and industries worldwide.
Need custom connector plates or metal panels? [Contact QIANXI today](mailto:info@qianxi.com) to discuss your project.