---
title: Choosing the Right Drill Bit for 0.8 mm Vias: A Practical Guide for Hobbyist PCB Makers
siteUrl: https://logzly.com/circuitdrillbits
author: circuitdrillbits (Precision Drilling Hub)
date: 2026-06-15T12:00:19.176984
tags: [pcb, drillbits, diy]
url: https://logzly.com/circuitdrillbits/choosing-the-right-drill-bit-for-0-8-mm-vias-a-practical-guide-for-hobbyist-pcb-makers
---


If you’re struggling with ragged holes or broken tips when **drilling 0.8 mm vias**, this guide shows you exactly which **drill bit for 0.8 mm vias** to buy, how to set your machine, and the maintenance tricks that keep every hole clean and round. Follow the step‑by‑step method below and start producing professional‑grade boards on your bench‑top drill press today.

## Why 0.8 mm Vias Matter

Most hobbyist designs settle on a **0.8 mm via** because it offers a sweet spot between current capacity and board density. The hole is small enough to keep the board thin, yet large enough to carry the current needed for Arduino‑level projects. Oversized holes waste copper and misalign pads, while undersized or out‑of‑round holes cause plating gaps and intermittent connections.

## The Anatomy of a Micro Drill Bit

### Material: Carbide vs. High‑Speed Steel

- **Carbide** bits stay sharp longer, resist heat, and produce the cleanest cut for sub‑millimeter drilling.  
- **High‑speed steel (HSS)** is cheaper but dulls quickly at the high speeds required for 0.8 mm holes.  

**Rule of thumb:** If you plan to drill more than ten boards a month, invest in carbide.

### Point Angle

The tip angle determines how the bit penetrates the material.  
- **118°** is common—it gives a sharp point without being overly fragile.  
- **135°** adds rigidity but can cause the bit to wander on thin copper.

### Flute Length and Pitch

Flutes carry chips away from the hole. For PCB material:  

- **Short flute (~1 mm)** works best because the chips are tiny.  
- **Fine pitch** (typically two flutes) is sufficient for a 0.8 mm bit.

### Shank Size

Match the shank to your drill chuck:  

- **2 mm shank** on a bench‑top PCB drill press provides a stable grip and reduces wobble.  
- **1 mm shank** works with rotary tools and collets, though you may notice a bit more chatter.

## Setting Up Your Drill

### Speed (RPM)

Higher speeds lower the cutting force, protecting the bit from breakage.  
- Aim for **30 000 – 35 000 RPM** with a 0.8 mm carbide bit.  
- If your drill can hit 38 000 RPM, dial back a notch to avoid overheating.

### Feed Rate

Feed rate is the speed at which you push the bit into the board.  
- **~0.1 mm per second** provides a slow, steady feed that keeps heat and chip buildup low.  

### Lubrication

A drop of cutting oil or water keeps the bit cool and flushes chips.  
- **Light mineral oil** is ideal—it evaporates quickly and leaves no residue on copper.

For a full walkthrough of tool selection and alignment, see our [DIY precision drilling setup](/circuitdrillbits/stepbystep-diy-precision-drilling-setup-from-tool-selection-to-perfectly-aligned-holes).

## My Personal Drill‑Down Story

The first time I tried a 0.8 mm via on a home‑brew board, I used a cheap HSS bit from a hardware store. The tip snapped after three holes, leaving the board looking like Swiss cheese. I spent an afternoon cleaning the mess and had to re‑drill the entire batch. That failure taught me two things: never skimp on bit material, and always check **runout** (wobble) before you start. Switching to a reputable set of 0.8 mm carbide bits transformed the results—holes were clean, round, and required no touch‑up.

## Choosing the Right Bit for Your Project

If you need even finer holes for high‑density micro‑vias, consult our guide on selecting the [perfect 0.2 mm PCB drill bit](/circuitdrillbits/how-to-choose-the-perfect-0-2-mm-pcb-drill-bit-for-reliable-microvia-fabrication).

Below is a quick decision matrix I keep on my workbench:

| Use Case | Recommended Bit | Shank | Why |
|----------|----------------|-------|-----|
| **Low volume, occasional** | 0.8 mm HSS | 1 mm | Cheap for single prototypes; expect frequent replacement |
| **Medium volume, hobbyist batches** | 0.8 mm carbide | 2 mm | Best balance of cost and durability |
| **High precision, tight tolerances** | 0.7 mm carbide **or** 0.9 mm bit | 2 mm | 0.7 mm gives tighter holes; 0.9 mm adds clearance for hand‑soldered vias |

**Tip:** Match the bit size to your copper thickness and the plating process you plan to use. When sending boards out for professional plating, ask the fab for their preferred drill size.

## Maintenance Tips to Extend Bit Life

1. **Inspect before each session** – Remove chips from the flutes with a soft brush.  
2. **Check runout** – Spin the bit at low speed; any wobble means the tip is bent and should be replaced.  
3. **Store properly** – Keep bits in a metal case with a soft liner. Moisture rusts HSS bits, and loose carbide can pick up grit.

## Final Thoughts

Drilling 0.8 mm vias isn’t rocket science, but it does demand respect for the tiny tools you’re using. By selecting the right **material**, matching the **shank** to your drill, and dialing in **speed** and **feed**, you’ll achieve clean, professional‑grade holes every time. At Precision Drilling Hub we’ve tested every cheap bit on the market—the verdict is clear: invest in a good carbide set and treat the bits like delicate brushes, not chisels. Your future self will thank you when the next batch of boards comes out perfect on the first try.