Stihl 015 Chain Size (Fitment Guide)
A Stihl 015 does not have one chain size that fits every saw. Match the replacement chain to the guide bar’s stamped pitch and gauge, then match its drive-link count to the bar specification or old chain. Confirm the clutch sprocket uses the same pitch. Some listings show 3/8-inch low-profile chains, but verify your exact setup before buying.
A chain can look sturdy and still be the wrong fit. One common myth is that an older, well-built saw can tolerate a chain that is “close enough.” It cannot. A mismatch may bind, run poorly, or damage the sprocket. Durability does not replace correct fitment.
I start by checking the bar and sprocket, not by guessing from the saw’s model name. Vintage 015 saws may have different bars, and replacement bars can change the required chain. The useful answer is on the parts fitted to your saw.
Identify the 015 Variant, Bar, and Chain Fitment
The right replacement chain is the one that matches three measurements: pitch, gauge, and drive-link count. The chain pitch must also match the clutch sprocket. The model name and bar length alone cannot confirm those details, so check the actual parts before ordering.
Find the pitch, gauge, and drive-link count
Pitch describes the spacing of the chain’s drive links and cutters. Read it from the guide-bar stamp or the bar maker’s specification. Then confirm that the clutch sprocket has the same pitch. A 3/8-inch standard chain and a 3/8-inch low-profile chain are different types; do not treat them as interchangeable.
Gauge is the thickness of the drive links that sit inside the bar groove. Common examples include .043 inch and .050 inch, but those are examples, not a claim about every 015. Match the gauge stamped on the bar or listed for its exact part number. A chain that is too thick will not fit the groove; one that is too thin may not be properly supported.
Drive links are the small tabs under the chain that travel inside the bar groove. Match their count to the bar specification, or count the links on the existing chain if you know it is the correct chain for that bar. Bar length does not tell you the count by itself.
I have seen owners bring in an old chain and ask for “the same size.” That works only when the old chain was correct. If its fit is uncertain, use the bar markings and part number, and verify the sprocket pitch as well.
| What to check | Where to find it | What must match |
|---|---|---|
| Pitch | Bar stamp or bar maker’s specification; sprocket specification | Chain pitch and clutch sprocket pitch |
| Gauge | Bar stamp or exact bar specification | Chain drive-link thickness and bar groove |
| Drive-link count | Bar specification or a verified chain count | The chain’s total number of drive links |
| Bar length | Bar marking or measurement | The bar approved for that saw; not a substitute for link count |
If markings are worn or missing, identify the bar by its part number or ask a qualified dealer to confirm its specification. Do not order by “Stihl 015,” bar length, or a listing title alone.
Check the sprocket before fitting the chain
A chain can appear to sit in the bar while its pitch does not match the clutch sprocket. That is not a safe fit. If the chain binds, climbs, or runs abnormally, stop the saw and check both interfaces. Do not try to solve a pitch mismatch by adjusting tension.
Before ordering, write down the saw variant if known, bar part number, stamped pitch and gauge, and drive-link count. If a seller lists only a chain pitch or a bar length, ask for the other required details.
Prepare the Saw and Worksite for Field Cutting
Correct fitment is only one part of readiness. Before starting, inspect the saw, bar, chain, and safety parts, then prepare the work area. Use the operator’s manual for the exact 015 version and follow safe chainsaw practices, including ANSI Z133 guidance where applicable.
Fit and tension the chain
- Switch off the saw and let it cool if it has been running. Wear suitable protective equipment when handling the chain.
- Confirm that the chain matches the bar’s pitch, gauge, and drive-link count, and that its pitch matches the clutch sprocket.
- Check the cutter direction against the manual or bar markings. The cutting edges on the top of the bar must face forward, toward the bar nose.
- Release the chain brake as directed by the manual before checking chain movement. Fit the chain into the bar groove and around the sprocket. Do not force it.
- Adjust tension according to the manual. Drive links should remain engaged in the groove while the chain can still be moved by hand with gloves.
- Tighten the bar nuts as specified for the saw. Recheck the tension after tightening and again after the first cutting period, since a new or cold chain can settle.
A chain that is too loose can come off; one that is too tight can add strain to the cutting system. If it will not move by hand with gloves, binds, or lifts away from the bar in a way the manual does not allow, stop and correct the fit or tension before starting.
Inspect the saw and work area
Check the bar rails, groove, oil outlet, chain, and sprocket for damage or heavy wear. Also inspect the chain brake, throttle lockout, handles, and chain catcher. If a safety part is damaged or does not work as intended, do not use the saw until it is repaired.
Before starting, assess the worksite for nearby people, obstacles, and other hazards. Plan a clear escape path where needed. Start the saw on stable ground using the manual’s cold- or warm-start procedure. Never drop-start it.
Once running, confirm that the chain brake works and that bar oil reaches the chain, following the manual’s check procedure. Maintain two-hand control. Avoid the upper quadrant at the bar nose, and do not cut above shoulder height. In logging work covered by OSHA 29 CFR 1910.266, follow those applicable requirements as well.
Maintain, Sharpen, and Tune the 015
Maintenance depends on the exact saw, bar, chain, and oil. Use the manual for model-specific settings rather than applying a generic RPM, oil-flow figure, or fuel ratio. Keep the chain sharp and properly lubricated, and stop if its fit or operation changes.
Sharpen to the chain specification
A file that is too large or too small can damage the cutter profile. Do not choose a file size from the 015 model name. Identify the chain manufacturer and chain type, then use that chain’s sharpening instructions for file size, filing angle, and depth-gauge setting. If the chain type cannot be identified, do not guess.
Keep cutters even and inspect for damage as you sharpen. A chain that cuts crooked, produces fine dust instead of normal chips, or needs unusual force may be dull or damaged. Stop and inspect it rather than pushing harder. A chain with cracked, badly worn, or otherwise unsafe parts should be replaced, not sharpened back into service.
Clean the bar groove and oil outlet as part of routine care. Check the bar rails and turn the bar if the bar maker’s instructions call for it. Confirm oil delivery before cutting; never assume a full oil tank means oil is reaching the chain.
Use the correct fuel and operating settings
The 015 is a two-stroke saw, so do not run straight gasoline. Use the fuel ratio specified in the operator’s manual for the exact 015 version and the oil being used. Do not assume 50:1 applies to every vintage 015 or every oil type. If the correct manual is missing, confirm the ratio with a reliable model-specific source before mixing fuel.
Use the manual’s idle and maximum-speed specifications. A generic RPM figure may not suit your saw, and improper adjustment can create unsafe operation or damage. If the saw will not idle, accelerates unexpectedly, or runs poorly, stop and get model-specific service guidance rather than changing settings by guesswork.
| Symptom | Check first | Safe next step |
|---|---|---|
| Chain binds or climbs | Pitch at bar and sprocket; gauge and link fit | Stop; correct mismatched parts before running |
| Chain is hard to move | Tension, chain brake position, damage | Follow the manual; do not force it |
| Chain cuts poorly | Sharpness, cutter condition, lubrication | Sharpen to chain specifications or replace |
| Bar and chain seem dry | Oil level, oil outlet, delivery check | Clean and verify oil delivery before cutting |
| Saw runs poorly | Correct fuel mix and manual settings | Stop and check the exact model’s instructions |
Store the Saw and Manage Seasonal Fuel
Safe storage protects the chain and helps prevent mix-ups when the saw comes back out. Shut the saw off, let it cool, and follow the manual’s storage directions for fuel. Store the saw, chain, and fuel securely, away from children and ignition sources.
After cutting, clean the bar groove and oil outlet, then inspect the chain, bar, and tension. Refuel only with the engine stopped and cool. For longer storage, follow the manual’s fuel guidance; do not assume every fuel blend or storage period is handled the same way.
Before the next job, repeat the fitment check if you changed the bar or chain. A replacement bar can change the pitch, gauge, or required drive-link count. Keep a note of the verified bar part number and chain specifications with the saw. That small record is more reliable than memory when ordering parts later.
The key point is simple: buy for the bar and sprocket fitted to your 015, not just for the saw name. Confirm pitch, gauge, and drive links, then follow the manual for installation and operation.
Frequently Asked Questions
These short answers cover the most common chain-fit questions for the Stihl 015. Since 015 saws and replacement bars can differ, use them as checks, not substitutes for the markings and specifications on your own equipment.
What chain size does a Stihl 015 use?
There is no single chain size for every Stihl 015. Match the chain pitch, gauge, and drive-link count to the fitted guide bar, and confirm the pitch also matches the clutch sprocket.
Is the 015 chain always 3/8-inch low profile?
No. Some fitment listings show 3/8-inch low-profile chains, but listings do not establish what is fitted to every 015. Check the bar and sprocket before buying.
Can I use a standard 3/8-inch chain instead of 3/8-inch low profile?
Do not assume they interchange. They are different chain types. Confirm the chain pitch and type required by the guide bar and clutch sprocket.
How do I find the drive-link count?
Use the exact bar specification or count the drive links on a chain known to fit that bar. Do not estimate the count from bar length alone.
Does bar length tell me which chain to order?
No. Bar length does not establish pitch, gauge, or drive-link count. Check the bar markings or part number for the complete specification.
Can I copy the size printed on my old chain?
Only if you know the old chain is correct for the current bar and sprocket. If you are unsure, verify the bar and sprocket specifications instead.
What happens if chain pitch does not match the sprocket?
The chain may run abnormally, bind, or climb, and the mismatch can damage parts. Stop the saw and verify compatibility before further use.
What file size and angle should I use?
They depend on the exact chain type, not just the saw model. Follow the chain maker’s sharpening instructions for file size, filing angle, and depth gauges.
Is 50:1 the correct fuel mix for every Stihl 015?
Do not assume so. Use the ratio in the manual for the exact 015 version and oil. Never run straight gasoline in the two-stroke engine.
What should I do if the chain feels too tight after fitting?
Stop and check the chain brake position, tension, and whether the chain matches the bar and sprocket. Follow the manual’s tension procedure; do not force a binding chain.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
