This precision-engineered brass thumb screw, model 5.5x14 M3x12, is designed for tool-less fastening in demanding lighting assembly applications. Crafted from high-quality brass, it offers excellent corrosion resistance and electrical conductivity, ensuring both the longevity and safety of your lighting fixtures. The knurled head allows for easy hand-tightening and adjustment, streamlining installation and maintenance processes.
Material: High-Grade Brass (Excellent corrosion resistance)
Head Type: Knurled Thumb Head (For tool-less operation)
Thread: M3 x 0.5mm Pitch
Shank Dimensions: 5.5mm Diameter x 14mm Length
Finish: Natural Brass (Ideal for plating or natural patina)
Lighting Fixture Assembly: Securing glass shades, diffusers, and structural components.
Access Panel Fastening: For easy access to internal electrical components in luminaires.
Adjustable Mounting Systems: Ideal for positioning track lighting heads or adjustable arms.
Decorative Hardware: Provides a functional and aesthetically pleasing fastening solution.
| Specification | Value |
|---|---|
| Product Type | Thumb Screw / Knurled Head Screw |
| Material | Brass |
| Thread Size | M3 x 0.5mm |
| Total Length | 12 mm |
| Shank Diameter | 5.5 mm |
| Shank Length | 14 mm |
| Drive Type | Hand / Thumb |
Superior Corrosion Resistance: Brass naturally resists tarnishing and corrosion from environmental exposure, crucial for long-lasting lighting fixture integrity.
Enhanced Safety & Conductivity: Provides reliable electrical grounding within the fixture, a critical safety factor in metal lighting assemblies.
Streamlined Maintenance: Enables quick, tool-free disassembly for servicing internal components like drivers and LEDs, reducing downtime.
Robust Mechanical Strength: The specified dimensions and brass material ensure high tensile strength, preventing failure under vibration or thermal stress common in lighting.
Customer Service
With over 20 years of dedication to the lighting and hardware industry, we provide a professional and reliable supply of lighting fixture parts.Our commitment to quality and excellence is validated by international certifications, ensuring that our products meet the highest global standards for performance and safety.




Q1. Can I have a sample order for the product?
A: Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.
Q2. What about the lead time?
A: 3-5 days for Sample preparing ,8-10 working days for mass production.
Q3. How do you ship the goods and how long does it take to arrive?
A: Ship by DHL, UPS, FedEx or TNT. It takes 3-5 days to arrive. Airline and sea shipping also optional.