I remember a cold Saturday morning on the back lot. I had my Echo CS-590 Timber Wolf and a few oak logs to cut. The saw ran great at first. It ripped through the wood.
But after an hour, the cutting slowed down. I saw dust instead of chips. The chain was dull. I walked to my truck and looked at my tools. I saw a handful of loose round files.
I paused. I had small files and big files. I was not sure which one fit the Timber Wolf. If you are stuck like I was, let me help you.
The Correct Size is 7/32 Inch
Here is the answer. You need a 7/32″ (5.5 mm) round file.
The Echo CS-590 is a strong saw. It comes with a big chain. This chain has a 3/8″ pitch. This is standard for pro saws. It needs a thick file to get a good edge.
I almost grabbed a small file that day. That would have been bad. The 7/32″ file is the only one that fits right. It sits high on the tooth. This gives you a sharp, strong edge.
Why Size Matters (My Mistake)
I learned this the hard way years ago. I tried to sharpen a big chain with a small file. I used a 3/16″ file because it was all I had.
It felt like it worked. But the angle was wrong. The small file cut too deep. It made a hook shape on the tooth.
When I tried to cut, the saw grabbed the wood. It jerked in my hands. It was jumpy and unsafe.
On the CS-590, use the 7/32″ file. The chain will cut smooth. It feeds into the wood with ease. You won’t have to push down on the bar.
How to Check Your Chain
You might have bought your saw used. Or maybe the bar was changed. It is smart to check.
Wipe the grease off the chain. Look at the drive link. That is the bottom part that rides in the bar groove. You will see a number stamped there.
- Look for “72” or “73”: These are codes for 3/8″ chain. You need the 7/32″ file.
- Check the Box: If you have the box, it will say “3/8 Pitch.”
Quick File Guide
I keep this list in my head now. It helps to see it clearly.
| Chain Pitch | File Size You Need | Notes |
| 3/8″ (Standard) | 7/32″ (5.5 mm) | Correct for CS-590 |
| .325″ | 3/16″ (4.8 mm) | Too small for this saw |
| 3/8″ Low Profile | 5/32″ (4.0 mm) | Way too small |
The Feel of a Sharp Chain
I love hand-filing my saw in the woods. I clamp the saw between my knees.
Listen to the sound. A dull chain scrapes. But the right file makes a crisp zing sound. You can feel the steel bite.
I give each tooth three firm strokes. The edge shines like a mirror. That is when I know I can get back to work.
Final Tips
Don’t guess. If you run a stock Echo CS-590, buy a pack of 7/32″ files. Keep one in your pocket.
There is nothing worse than a dull chain far from home. A sharp chain makes the work easy. It saves your back and keeps the saw running cool.
FAQs – File Size for My Echo CS-590
What is the correct file size for an Echo CS-590?
You need a 7/32 inch round file for the Echo CS-590. This size fits the standard 3/8 pitch chain perfectly. Using the right tool helps your saw cut wood fast and smooth.
Can I use a 3/16 inch file on my Echo CS-590?
No, a 3/16 inch file is too small for this saw. It creates a deep hook on the tooth that grabs the wood. Stick to the 7/32 inch size for a safe cut on your Echo CS-590.
How do I find the pitch on my Echo CS-590 chain?
Look at the drive link for a stamped number. If you see 72 or 73, you have a 3/8 pitch chain. This pitch needs a large 7/32 file to stay sharp and ready for work.
What is the best filing angle for an Echo CS-590?
File the chain at a 30-degree angle for the best edge. Hold the file flat as you push it. This angle gives the Echo CS-590 a strong edge that cuts hard wood well.
How often should I sharpen my Echo CS-590 chain?
Sharpen it when the saw makes dust, not wood chips. A quick touch-up every tank of gas helps too. Regular care keeps your Echo CS-590 running fast and safe all day.