The file size you choose for sharpening your chainsaw blade might seem like a small thing, but it can mean the difference between dangerously dull and razor-sharp teeth. This guide breaks down what you need to know to keep your chainsaw running efficiently through everything—from the thinnest branches to the thickest trunks.
GET TO THE POINT
Chainsaw files are essential for sharpening the cutting edges of a chainsaw chain, which will enhance the performance and extend the life cycle of your equipment. Dull blades don’t cut as well and can make your chainsaw eat up fuel a lot faster. There are major benefits to sharpening your chainsaw blade:
-
Proper tooth shape.
- The correct file size ensures the ideal angle and shape are created on the cutting teeth, which is crucial for efficient sawing.
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Better gullet clearance.
- The correct file size helps to create proper clearance in the gullet, which is the area between the cutting teeth where wood chips are removed.
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Enhanced performance.
- Using the wrong file size can lead to dull chains, reduced cutting speed, and even damage to the chain or chainsaw.
There are two ways to determine the correct file size for your chainsaw:
1. Check your chainsaw's manual. Your owner’s manual will specify the pitch of your chain and the corresponding file size.
2. Measure the chain. You can measure the pitch by measuring the distance between three consecutive rivets and dividing by two. Read on to learn more about this step.
PITCH MAKES PERFECT
Chain sharpening with an incorrect file size can result in poor sharpening and damage to the cutters, so it’s crucial to get it right! The main thing to remember is that the pitch of your chain will be the biggest determinant of what size of a file to use.
The pitch is the distance between any three drive links, divided by two.
Drive links on a chainsaw are the teeth on the bottom of the chain that engage with the bar's groove and the sprocket, transferring power and driving the chain. The larger the pitch, the higher the cutting teeth rise and the larger the file you will need.
This handy chainsaw file size chart includes the most common pitch sizes:
Chainsaw Pitch Measurement |
File Size Guide |
6.35 mm or 1/4 in. |
4.0 mm or 0.157 in. |
8.25 mm or .325 in. |
4.8 mm or 0.188 in. |
9.525 mm or 3/8 in. |
5.2 mm or 0.204 in. |
10.26 mm or 404 in. |
5.5 mm or 0.216 in. |
SIZE MATTERS, BUT SO DOES SHAPE
Round or flat? That is the question! The specific shape of the file you need will depend on the cutter of your chainsaw chain. Round file sizes are much harder to measure than flat ones, so always check the size by looking at identifying markings stamped on your chainsaw or consulting your owner’s manual.
WANT HELP CHOOSING A CHAINSAW?
Greenworks has low-maintenance options available! Find the best electric chainsaw for your needs with this buying guide.
And if you’re not sure whether a gas or electric chainsaw is more suited to your needs, read our blog post about Electric vs. Gas Chainsaws.
FINAL THOUGHTS
Choosing the correct file size for chainsaw maintenance doesn’t have to be confusing. With the right tool and a little know-how, you’ll be ready to tackle just about any outdoor job like a pro!
Written by The Green Team, a creative arm within Greenworks Tools.
Our team of writers, designers and content creators bring a breadth of experience and a touch of fun to all things tools. With an assist from the Greenworks product teams and technology experts, we’re here to provide helpful and engaging content to make your yard (and life!) beautiful.
