What is a micro drill bit?

A micro drill bit is a specialized precision cutting tool made of cemented carbide. We use this miniature tool to drill tiny, precise holes in various materials.

It is specifically designed for high-precision drilling and is suitable for industries requiring fine workmanship, such as electronics, jewelry making, and mold/model manufacturing.

Generally, micro drill bits are categorized into three size grades:

Ultra-micro: 0.18mm – 0.3mm

Medium: 0.3mm – 1mm

Large micro: 1mm – 1.5mm

Smaller drill bit sizes present greater machining challenges, demanding higher precision and stability from processing equipment.

What is a micro drill bit?

Unlike standard drill bits, micro drill bits exhibit several key distinctions:

Material: Compared to standard drills, they demand stricter material quality standards. Crafted from high-grade cemented carbide.

Different chip groove designs: Features specialized geometry optimized for chip removal in small holes.

Shank diameter exceeds cutting diameter: Typically larger than the cutting diameter to enhance stability and facilitate secure clamping.

Additionally, micro drills are brittle and require careful handling to prevent impact damage. They also necessitate higher rotational speeds during operation.

  • micro reamer

In which scenarios are micro drill bits used?

Micro drill bits are extensively employed in machining scenarios requiring precision drilling, where even the slightest error in these intricate processes can lead to product damage.

PCB through-holes

Watch components

Medical device manufacturing

Scientific instrument parts

Appropriate micro drill bits help maintain strict tolerances and ensure smooth machining, while clean, precise holes contribute to enhanced product quality.

Challenges in Industrial Applications

Electronics Manufacturing
Printed circuit boards (PCBs) primarily consist of fiberglass and copper, requiring the drilling of numerous micro-via holes to establish connections with electronic components. We typically employ carbide micro-drills for this task, as their hardness and wear resistance enable them to maintain sharpness for extended periods.

Medical Device Production
Implantable medical devices also feature numerous micro-holes for fluid channels, wire passages, and assembly. Since these components come into direct contact with the human body, titanium alloys are the primary material. We must drill multiple holes smaller than 0.5mm in diameter in titanium alloys—a task only achievable with carbide micro-drills.

Automotive Industry
Micro-holes are also in high demand in automotive manufacturing processes. They are commonly used in sensor mounts, fuel injectors, and similar applications, typically ranging in size from 0.1mm to 1.5mm. These holes must be drilled through challenging materials such as hardened steel, aluminum alloys, and engineering plastics.

Need a custom solution?

ZLY manufactures micro drills as small as 0.18mm. We utilize Swiss precision grinding equipment and maintain a constant 26°C environment to ensure processing accuracy and stability. Even the coolant is temperature-controlled via dedicated cooling systems, eliminating machine fluctuations caused by thermal variations.

Our years of expertise in cutting tool manufacturing deliver stable, precise, and reliable micro products, including but not limited to micro drills, micro flat-bottom drills, micro center drills, micro milling cutters, and other precision cutting tools.

You can view our Quick Customization page to custom you tools.

Or you can contact us now.

Or contact our customer support team at email: info@zlycuttingtools.com and our sales staff: liam@zlycuttingtools.com or click here to the WhatsApp, both of which will help you get in touch with our sales and support teams to resolve your issue.

If you need a detailed guide, please click here to view it.

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