Wonder if anyone knows what the score is here with Stihl round files for sharpening a chainsaw chain? I am running a semi-chisel 3/8 pitch chain, this according to Stihl requires a 3/64" / 5.2mm round file. However, when ordering a spare 3/64" file from Stihl, it comes marked as 3/64" / 5.0mm. (0.2mm undersize - with the next size up bein 7/32" / .404 / 5.5mm)

 

I also use the Stihl 2 in 1 sharpener and when I opened it up it has round files marked up as 13/64" and 5.2mm - the correct size!

 

When I measure the files with a micrometer, they are both 5.0mm!

 

This sizing of the files is apparently critical to getting the correct angle and cut to make the cutters sharpened correctly, so which is it to be then? Is 13/64" / 5.0 mm correct or is 13/64" / 5.2 mm correct? 

 

I am confused, but trying to get a response from Stihl is a waste of time, anyone running a 3/8" Chain from Stihl, if so what size round file are you using?

 

Thanks!

Even in Europe it is easy to buy a chain saw but getting the salesperson to admit that there is such a thing as a chainsaw file, and even, if we get really nerdy about it, a correct chainsaw file size is a persistent battle. Then comes technique of filing. If you are using you saw a lot you might want to buy a chain sharpening machine, which you will also have to learn how to use.

Anyway: as far as I remember, the round file should be 1/5 larger than the hole it is filing. You also need to file down the depth guages from time to time. I'm giving you what is basically useless information, most of us learnt it professionally and I find it a scam that saws are sold without instructions as to how to maintain the chain. Don't rely on information from Stihl, the chains are interchangeable, good luck.

On 2/20/2025 at 9:33 PM, Formaleins said:

Wonder if anyone knows what the score is here with Stihl round files for sharpening a chainsaw chain? I am running a semi-chisel 3/8 pitch chain, this according to Stihl requires a 3/64" / 5.2mm round file. However, when ordering a spare 3/64" file from Stihl, it comes marked as 3/64" / 5.0mm. (0.2mm undersize - with the next size up bein 7/32" / .404 / 5.5mm)

 

I also use the Stihl 2 in 1 sharpener and when I opened it up it has round files marked up as 13/64" and 5.2mm - the correct size!

 

When I measure the files with a micrometer, they are both 5.0mm!

 

This sizing of the files is apparently critical to getting the correct angle and cut to make the cutters sharpened correctly, so which is it to be then? Is 13/64" / 5.0 mm correct or is 13/64" / 5.2 mm correct? 

 

I am confused, but trying to get a response from Stihl is a waste of time, anyone running a 3/8" Chain from Stihl, if so what size round file are you using?

 

Thanks!

Not critical IMO. Don't over-intellectualize it. Use the 13/64 that you get, and ditch the micrometer. +/- 0.2 mm is not going to make much difference. I've used 7/32 files on 3/8 pitch chain for going on 5 decades and done a whole lot of safe and efficient tree work that way.  Concentrate instead on smooth and consistent filing  strokes and angle.  Insure good grip and control of the saw, good footing and solid stance. Keep your chain out of the dirt, and off of your leg and face.  Save the beers and weed until after the job is done and the chainsaw is is in the shed. 

 

https://www.arboristsite.com/threads/7-32-vs-13-64-file-size.63238/#:~:text=HUSKYMAN said%3A-,In theory the 13%2F64 should cut faster due to,to do with cutting speed.