Guangzhou Jhome Cnc Tools Co.,Ltd
Carbide PCB micro drill bits
PCB Micro-Diameter Drill
Micro Hole Machining Expert | High Precision · Long Life · No Breakage
Ideal for PCB, FPC, Ceramic Substrates & Composite Materials
Product Overview
Our PCB Micro-Diameter Drills are specifically designed for high‑density micro‑hole drilling in printed circuit boards, packaging substrates, flexible printed circuits, and various thin sheet materials. Manufactured from ultra‑fine grain tungsten carbide with precision grinding, the drill diameter can be as small as 0.05 mm. They meet the demanding requirements of HDI boards, IC substrates, and mobile phone motherboards for hole diameter accuracy, hole wall quality, and breakage resistance.
Key Advantages
1. Ultra‑Fine Diameter, High Precision
- Diameter range: 0.05 mm – 1.0 mm (as small as 0.05 mm)
- Diameter tolerance: ±0.002 mm – consistent hole size
- Tip concentricity ≤ 0.002 mm – excellent positional accuracy
2. Ultra‑Fine Carbide – Wear Resistant & Fracture Resistant
- Grain size ≤ 0.2 μm, hardness > HRA 92.5
- Transverse rupture strength ≥ 4000 MPa – significantly reduces breakage risk
- Tool life 30–50% longer than standard carbide micro drills
3. Optimized Flute Design for Smooth Chip Evacuation
- Special parabolic flute or double margin design for low chip clogging
- Suitable for high‑speed spindles (60,000 – 300,000 rpm)
- Hole wall roughness Ra ≤ 0.8 μm – minimizes deburring
4. Coating Options for Different Board Materials
- Uncoated – for standard FR‑4 glass fiber boards
- DLC coating – reduces friction, ideal for aluminum‑backed or copper‑backed boards
- TiSiN / Nano‑composite coating – for high‑frequency, high‑Tg, or ceramic‑filled materials
Typical Applications
| Application | Typical Materials | Common Hole Diameters |
|---|---|---|
| HDI boards / IC substrates | FR‑4 high Tg, BT resin | 0.10 – 0.25 mm |
| Flexible PCBs (FPC) | Polyimide (PI) | 0.05 – 0.15 mm |
| Multilayer back drilling | FR‑4 + copper foil | 0.20 – 0.50 mm |
| Ceramic substrates | Alumina, aluminum nitride | 0.10 – 0.30 mm |
| Composite materials | Carbon fiber, aluminum‑backed boards | 0.15 – 0.50 mm |
Quick Application Guide
Spindle – Use high‑precision air‑bearing or electric spindle; runout ≤ 0.005 mm
Speed – Select according to diameter:
Ø 0.10 mm: 80,000 – 120,000 rpm
Ø 0.30 mm: 50,000 – 80,000 rpm
Ø 0.50 mm: 30,000 – 50,000 rpm
Feed rate – 5 – 20 mm/s (adjust based on material hardness and drill diameter)
Drilling depth – Single pass depth ≤ 8× diameter (use pecking if deeper)
Entry/backup materials – Recommend aluminum entry sheet or phenolic backup board to reduce burrs
Hit count management – Recommended hits per drill: 800 – 3,000 (depending on board material)
Why Choose Our PCB Micro Drills?
✅ Ground on Swiss / Japanese 5‑axis CNC grinders – diameter accuracy ±0.002 mm
✅ 100% microscopic inspection – no chipping, no eccentricity
✅ Fracture strength test report available – fully traceable per batch
✅ Customization supported – flute length, overall length, shank diameter (3.175 mm or custom)
✅ Fast sampling – new designs delivered within 7 working days
✅ Free drilling parameter recommendations to help you optimize your process
