As demand for high-precision PCB drilling continues to grow, Zhuzhou Century Tool is expanding its ready-stock PCB micro drill range to provide customers with faster delivery and more flexible purchasing options. We currently maintain regular stock of 0.20–0.50 mm PCB micro drills, covering seven commonly used diameters.

Sep 19th,2026 97 Views

As demand for high-precision PCB drilling continues to grow, Zhuzhou Century Tool is expanding its ready-stock PCB micro drill range to provide customers with faster delivery and more flexible purchasing options.

We currently maintain regular stock of 0.20–0.50 mm PCB micro drills, covering seven commonly used diameters.

Ready-Stock PCB Micro Drill Sizes

Drill Diameter	Cutting Length	Shank Diameter	Overall Length
0.20 mm	4 mm	3.175 mm	38 mm
0.25 mm	5 mm	3.175 mm	38 mm
0.30 mm	6 mm	3.175 mm	38 mm
0.35 mm	6.5 mm	3.175 mm	38 mm
0.40 mm	7 mm	3.175 mm	38 mm
0.45 mm	7 mm	3.175 mm	38 mm
0.50 mm	8 mm	3.175 mm	38 mm

All listed standard sizes feature a 3.175 mm shank and 38 mm overall length, making them suitable for customers looking for readily available standard PCB drilling tools.

YU06A Fine-Grain Tungsten Carbide

The stocked PCB micro drills are manufactured using YU06A fine-grain tungsten carbide.

According to the carbide material specification, YU06A has a 0.4 μm grain size, 6% cobalt content, HRA 94.6 hardness and 3,800 N/mm² transverse rupture strength (TRS).

This combination of fine grain structure, hardness and strength provides a suitable carbide substrate for precision cutting tools where wear resistance and dimensional stability are important.

YU06A Carbide Properties

Property	YU06A
ISO Classification	K05–K10
Grain Size	0.4 μm
Cobalt Content	6.0 wt%
Density	14.70 g/cm³
Hardness	HRA 94.6
Hardness	HV30 2100
TRS	3,800 N/mm²
Fracture Toughness	8.31 MPa·m½

Why Stock Small-Diameter PCB Drills?

For PCB manufacturers, tooling availability can directly affect production scheduling. Small-diameter drills are particularly important in applications involving fine holes, high-density PCB structures and precision electronic components.

By keeping commonly requested sizes in stock, Zhuzhou Century Tool can help customers:

Reduce waiting time for standard sizes
Quickly obtain samples for testing
Replenish tools for production
Support small-batch and urgent orders
Test different drill diameters before placing larger orders

Applications

Our PCB micro drills can be used for precision drilling applications involving various PCB and composite materials, depending on the specific tool geometry and machining parameters.

Typical applications include:

PCB micro drilling
HDI PCB production
Precision circuit board drilling
Electronic component manufacturing
PCB prototyping
High-volume PCB production

For different PCB materials and drilling conditions, drill geometry, carbide grade, spindle speed, feed rate and hole depth should be considered together when selecting the appropriate tool.

From 0.20 mm Stock Sizes to OEM PCB Drills

Our current ready-stock range covers 0.20–0.50 mm standard PCB micro drills.

For customers requiring other diameters, special geometries or customized specifications, Zhuzhou Century Tool also provides OEM and customized PCB drilling solutions.

If you are looking for 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm PCB micro drills, contact us to check current stock availability and discuss your application.

Zhuzhou Century Tool — Carbide PCB Micro Drills for Precision PCB Manufacturing.

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