What Size File Should I Use For My Chainsaw? A Handy File Size Chart
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 do not cut as well and can make your chainsaw eat up fuel a lot faster. But what size file should you use to sharpen it? It can be quite tricky to know, as there are so many different types of chains.
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. The larger the pitch, the higher the cutting teeth rise and the larger the file you will need.
See below for a diagram of the chainsaw chain, which illustrates the pitch and various parts:
So, to decide what type of file to use, you first need to determine what length of pitch you have. Chain sharpening with an incorrect file size can result in ineffective sharpening and damage to the cutters, so it is crucial you get it right. There are various pitch sizes with accordant file sizes.
See below for our handy chainsaw file size chart, which includes the most common pitch sizes:
| Chainsaw Pitch Measurement | File Size Guide |
| 6.35 mm or 1/4″ | 4.0 mm or 0.157” |
| 8.25 mm or .325” | 4.8 mm or 0.188” |
| 9.525 mm or 3/8″ | 5.2 mm or 0.204” |
| 10.26 mm or 404” | 5.5 mm or 0.216” |
The specific shape of the file you need will depend on the cutter of your chainsaw chain, but it will either be flat or round. Round file sizes are much harder to measure than flat ones, so always check the size on the handle. There are three main cutters that each need a different type of file.
The different cutter, or tooth, types and their most suitable file shapes, include the following:
- Round tooth (or chipper), which will require a round file
- Square tooth, round grind (or semi-chisel), which will need a round file used with a file guide
- Square tooth, square grind (or chisel), which will need a flat-shaped file
You may have a chainsaw chain with a slightly different pitch or cutter type, which means you may have to adjust the file size and shape. Just remember that the pitch is the most important thing in determining the right size and adjusting the file accordingly.
There are a few types of chainsaw files available, which include the following:
- Brass
- Carbide
- Diamond
- Steel
As there is a lot of room for variation, you can buy a file kit for easier and more versatile chainsaw maintenance. This will give you the flexibility you need to adapt to your saw and can more easily let you adjust the file size according to the pitch measurement of the chain you are sharpening.
In most cases, you can find the file size you need by looking at your chainsaw’s manual too. A good way to avoid the headache of chainsaw sharpening is to take your chainsaw for regular servicing with your supplier.
All quality suppliers should have hassle-free servicing plans to keep your chainsaw chain sharp.
How to Sharpen a Chainsaw Chain
When you want to sharpen your chainsaw by yourself, keep the following useful tips in mind:
- Measure the pitch
- Select the right file size and shape for the pitch, use a file guide if the cutters require it
- Protect your hands and fingers with gloves
- Always ensure the chain brake is on, take it off and put it back on as you move down
- Hold the guide bar firmly in place, ideally using a plate vice or a portable workbench
- If you are using a file guide, keep the arrows on the guide facing the front of the chain
- File gently and evenly with short strokes, do not be too rough!
You should always be careful when sharpening chainsaws as even a dull chain can cause injury.
A Chainsaw File Size Guide from Garden Machinery Experts
As leading suppliers of STIHL, Snapper, Husqvarna and Mountfield chainsaws, as well as many other brands, we are familiar with the chain pitches, cutters, appropriate file sizes and general maintenance needs of your chainsaw. We hope you have found the file chart useful! Browse our wonderful selection of chainsaws online today and you can buy with fast UK delivery options.
The best way to keep your chainsaw in top condition is to use our superb servicing plans, which are available with or without a purchase and come with convenient collection or delivery. Using our tool-sharpening service will ensure your chainsaw is sharpened correctly by professionals. Please feel free to get in touch with us if you have any questions about our products or services.
