What Size File for STIHL Pole Saw Chain? 3.2 mm or 4.0 mm

Quick answer: What size file for STIHL pole saw chain depends on the chain pitch. STIHL’s 1/4 inch P (PICCO) chain, used on pole pruners like the HT 56 C-E, takes a 3.2 mm (1/8 inch) round file. Its 3/8 inch P chain, like the 61 PMM3 on the HT 135, takes a 4.0 mm (5/32 inch) file. The pitch is the number that decides it.

So the real job is finding your chain’s pitch. Get that right and the file size follows. When I checked STIHL’s own product pages, the two pole pruners that list their chain use different pitches, which is exactly why I wouldn’t guess.

Get it wrong and the cutters won’t take the shape they were designed for. The chain then cuts slowly, and you end up filing more often to make up for it.

STIHL Pole Saw Chain File Sizes

Here’s the short version, by chain pitch. Honestly, this table is the whole answer for most owners:

Chain pitch	Example STIHL chain	Round file size
1/4” P (PICCO)	PICCO Micro 3 (PM3), 1/4” .043”, sold as 71 PM3	3.2 mm (1/8 inch)
3/8” P (PICCO, low profile)	PICCO Micro Mini 3 (PMM3), 3/8” .043”, sold as 61 PMM3	4.0 mm (5/32 inch)

STIHL’s Australian store lists its replacement round file for 1/4” P chain at 3.2 mm diameter and 200 mm long. For 3/8 inch low-profile chain, Oregon’s 5/32 inch (4.0 mm) round files are labeled for 3/8 inch low profile and 1/4 inch pitch chain. STIHL’s 3/8” P PICCO chain is a low-profile 3/8 inch chain, so that 4.0 mm size is the one to use.

What Size File for STIHL Pole Saw Chain, by Model

These are the two current gas pole pruners where STIHL USA states the chain on the product page:

STIHL model	Chain pitch (STIHL USA)	Guide bar	File size
HT 56 C-E	1/4” P	10 in	3.2 mm (1/8 inch)
HT 135	3/8” P, PICCO Micro Mini (61 PMM3)	14 in	4.0 mm (5/32 inch)

STIHL sells a lot of other pole pruners, including the HT 105, HT 134, HT 250 and the battery HTA 30, HTA 50, HTA 66, HTA 86, HTA 135, HTA 140, HTA 150 and HTA 160. I couldn’t confirm the chain on each of those from STIHL’s product pages. My advice: check the pitch on your bar or in the instruction manual rather than guessing from the model number.

STIHL describes its 1/4” PM3 chain as “saw chain for pole pruner and compact chainsaws,” so a lot of smaller pole saws use it. Don’t assume, though. The HT 135 shows that bigger pole pruners can run 3/8” P.

How to Find Your Chain Pitch

Here’s the order I’d check, quickest first:

1. Look at the chain box or receipt. STIHL part numbers starting 3670 are its 71 PM3 (1/4” P) chain, according to STIHL USA’s product listing.
2. Read the guide bar markings. Check the bar itself and its part number for pitch and gauge.
3. Check the instruction manual. STIHL’s manuals list the approved bar and chain combinations for each pole pruner.
4. Ask a STIHL dealer. Bring the chain or the model number and they’ll match it.

Don’t Confuse 1/4” P with Standard 1/4” Pitch

This catches people. Oregon labels its 5/32 inch (4.0 mm) file for standard 1/4 inch pitch chain, while STIHL lists a 3.2 mm file for its 1/4” P chain. Different chains, different files.

The “P” matters. If the box or bar says “1/4 P” or “PICCO,” go with 3.2 mm.

What Changes the Answer

The file diameter stays tied to the pitch, but a few things affect how well the sharpening goes:

• A file holder or guide. It holds the file at the correct height on the cutter, and the angle marks keep you consistent. STIHL’s 2-in-1 file holder, for example, is listed for 1/4” PICCO, 3/8” PICCO, .325”, 3/8” and .404” chains.
• Wear on the file. A worn file cuts slowly and drags. Swap it when it starts sliding instead of cutting.
• Depth gauges. After a few sharpenings, the depth gauges in front of each cutter may need lowering with a flat file and gauge. The manual gives the setting for your chain.
• Damage. If a cutter is cracked or ground way back, or you hit a nail, a new chain is the safer call.

Don’t skip the safety part. Shut the engine off, or remove the battery on an HTA model, before you touch the chain. In practice, I’d also wear gloves, because a freshly sharpened PICCO chain is sharp enough to cut you through a careless swipe.

Pole Saw Sharpening Tips That Save Time

A few habits make filing a pole saw chain easier:

• Clamp the bar. A pole saw is long and awkward, so support the head in a vise or on a stable bench, keeping the pole supported along its length.
• File every cutter the same. I’d use the same number of strokes on each cutter so the cutters stay even.
• Mark your starting cutter. A dab of paint or marker shows where you began, so you don’t lose count on a long loop.

My take: a sharp chain is also a safer chain, because you push less and the saw is easier to control overhead. If you’re still deciding between a pole pruner and a regular saw, see pole saw vs chainsaw. For hedge work, there’s hedge trimmer vs chainsaw, and our saws and trimmers section covers the rest.

Frequently Asked Questions

What size file for STIHL 1/4 P chain?

A 3.2 mm (1/8 inch) round file. STIHL lists its replacement round file for 1/4” P saw chain at 3.2 mm diameter.

What size file for STIHL 3/8 P chain?

A 4.0 mm (5/32 inch) round file. That’s the size for 3/8 inch low-profile chain like STIHL’s 61 PMM3.

What size file does a STIHL HT 135 use?

STIHL USA lists the HT 135 with 3/8” PICCO Micro Mini (61 PMM3) chain, which takes a 4.0 mm (5/32 inch) file. Confirm the chain on your saw, since replacements can differ.

What size file for a STIHL HT 56 C-E?

STIHL USA lists 1/4” P chain for the HT 56 C-E, so use a 3.2 mm (1/8 inch) round file.

Can I use a 5/32 file on 1/4 P chain?

It’s the wrong size. A 5/32 inch (4.0 mm) file is too big for STIHL’s 1/4” P chain, which calls for 3.2 mm.

Last updated: November 10, 2026. Sources: STIHL USA HT 135 pole pruner, STIHL USA HT 56 C-E pole pruner, STIHL replacement round file for 1/4” P chain and Oregon 5/32 in. round saw chain files.