Changing the blade on your mitre saw is a basic but essential skill every DIYer and tradesperson should know. Whether your blade is dull, damaged, or you need a different type for a specific material, learning how to change a mitre saw blade safely will improve both performance and safety.
In this UK-focused guide, you’ll learn the exact steps, tools required, and expert tips to replace your mitre saw blade correctly.
Contents
Why You Might Need to Change a Mitre Saw Blade
You should replace or change your blade when:
- Cuts become rough or splintered
- The blade is dull or worn
- You switch materials (e.g. wood → laminate → metal)
- You notice burning marks on wood
👉 A sharp, correct blade = cleaner cuts + safer operation
Tools You’ll Need
Before starting, prepare:
- Spanner or Allen key (usually included with the saw)
- New mitre saw blade (correct size, e.g. 216mm or 255mm)
- Gloves (for handling the blade)
- Clean cloth
Safety First (Very Important)
Before changing the blade:
- 🔌 Unplug the mitre saw (never skip this)
- Wait for the blade to fully stop
- Wear gloves to avoid cuts
- Work in a well-lit area
Step-by-Step: How to Change a Mitre Saw Blade
Step 1: Disconnect Power
Unplug the saw from the mains supply.
👉 This is non-negotiable for safety.
Step 2: Raise the Blade Guard
- Lift or retract the blade guard
- Some models require pressing a release lever
Step 3: Lock the Spindle
- Press the spindle lock button
- Rotate the blade manually until it locks
👉 This prevents the blade from spinning while loosening the bolt.
Step 4: Loosen the Blade Bolt
⚠️ Important:
- Many mitre saws use a reverse thread (left-hand thread)
👉 That means:
- Turn clockwise to loosen (opposite of normal)
Use the supplied spanner to remove the bolt.
Step 5: Remove the Old Blade
- Carefully take off the outer washer
- Remove the blade gently
👉 Avoid touching sharp edges directly.
Step 6: Install the New Blade
- Place the new blade onto the arbor
- Ensure the arrow direction matches the saw rotation
- Reattach washer and bolt
Step 7: Tighten the Bolt
- Hold the spindle lock again
- Tighten the bolt securely (do not overtighten)
Step 8: Lower Guard & Test
- Return the blade guard to position
- Plug in the saw
- Run it briefly (no load) to check alignment
Choosing the Right Blade (UK Guide)
For Wood:
- 24–40 teeth → rough cuts
- 60–80 teeth → fine finish
For Laminate:
- 60–80+ teeth (fine-tooth blade)
For Metal (if supported):
- Special metal-cutting blade
👉 Always match blade size (e.g. 216mm, 255mm) to your saw.
Common Mistakes to Avoid
❌ Not Unplugging the Saw
This is extremely dangerous.
❌ Installing Blade Backwards
Always follow the direction arrow.
❌ Using Wrong Blade Size
Can damage the saw or cause accidents.
❌ Overtightening the Bolt
May damage threads or make removal difficult later.
Pro Tips for UK Users
- Keep a spare blade for different materials
- Clean the blade regularly to extend lifespan
- Upgrade to premium blades for better finishes
- Store blades in a dry place to prevent rust
How Often Should You Change a Mitre Saw Blade?
- DIY users: every few months (depending on use)
- Professionals: more frequently
- Replace immediately if damaged
❓ FAQs: Changing a Mitre Saw Blade
Do mitre saw blades have reverse threads?
Yes, many mitre saws use a left-hand (reverse) thread, meaning you turn clockwise to loosen the bolt.
How do I know which blade to buy in the UK?
Check your saw’s manual for blade size (e.g. 216mm or 255mm) and arbor size. Always choose compatible blades.
Can I change a mitre saw blade without tools?
No, you usually need a spanner or Allen key to safely remove and install the blade.
How tight should a mitre saw blade be?
Tight enough to secure the blade firmly, but not overtightened. Excess force can damage the threads.
Is it safe to change a mitre saw blade yourself?
Yes, as long as the saw is unplugged and you follow proper safety steps.
Why is my new blade wobbling?
Possible causes include incorrect installation, loose bolt, or damaged washers. Stop using the saw and check immediately.
Final Thoughts
Learning how to change a mitre saw blade is a simple but critical skill that improves both safety and cutting performance. With the right steps and precautions, you can replace your blade quickly and confidently.
👉 Key takeaway:
- Always prioritise safety
- Use the correct blade
- Check installation before use
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