Husqvarna 257 Bar Sizes (Fitment Guide)
The Husqvarna 257 is a 56.5 cc saw, often paired with bars from 15 to 20 inches, but there is no one-size-fits-all chain setup. Check your saw’s manual and match the bar mount, chain pitch, gauge, and drive-link count before buying. For general cutting, 16 to 18 inches is a practical starting range when approved for your saw.
A bar listing that says “fits Husqvarna” does not prove it fits your 257. The mount may be wrong, or the chain may not match the sprocket and bar. That mismatch can stop a bar from fitting or make a chain unsafe to run.
I treat the saw, bar, chain, and drive sprocket as one system. Below, I’ll show you what to check, how to choose a useful bar length, and how to confirm fit before you order. Exact details can vary by saw version and installed parts, so use the markings on your equipment and the manual for your specific model.
Confirm your Husqvarna 257’s fitment
The 257 has a displacement of 56.5 cc, often rounded to 57 cc. That tells you the engine size, but it does not identify every compatible bar or chain. Before shopping, confirm the saw’s bar mount, sprocket pitch, chain gauge, and the manual’s approved bar range.
Husqvarna 257 bar lengths are commonly listed from 13 to 20 inches, with 15 to 20 inches frequently used. Listings can differ, and a saw may have had its sprocket or bar changed during its working life. The manual for your exact version is the best starting point. If you cannot confirm the setup, compare the markings on the installed bar and chain with the sprocket marking.
Check pitch, gauge, and drive links
Pitch is the spacing between chain rivets, measured across three rivets and divided by two. Gauge is the thickness of the chain’s drive links, which fit into the bar groove. Drive-link count is the number of links that sit in that groove and travel around the bar.
Many 257 setups use a 3/8-inch pitch and .058-inch gauge. Do not treat those numbers as universal for every 257. Read the sprocket marking and the bar or chain markings, then ensure the replacement chain matches all three components.
| Fitment detail | What to verify | Why it matters |
|---|---|---|
| Bar mount | Match the bar’s mount pattern to the saw | A wrong mount may not fit or line up with the oil holes |
| Chain pitch | Match the chain to the drive sprocket and bar | A pitch mismatch will not run correctly |
| Chain gauge | Match the chain drive-link thickness to the bar groove | A mismatch can bind or derail |
| Drive-link count | Match the chain to the specific bar and sprocket | Count varies with bar length and setup |
| Bar length | Confirm the manual’s approved range | A longer bar is not automatically suitable |
Do not order from bar length alone. A 16-inch bar, for example, does not tell you its mount pattern, pitch, or gauge. The correct replacement chain also depends on the bar and sprocket, so confirm all parts as a set.
Choose a bar length for the work
Bar length is the usable cutting length from the saw body to the bar tip. A longer bar can reach farther into a cut, but it does not add engine power. Wood diameter, wood hardness, chain sharpness, and operator skill all affect how well the saw cuts.
For many general-purpose jobs, 16 to 18 inches is a practical range if your manual allows it. A shorter bar can be easier to handle for frequent limbing. Consider a longer bar only when the wood and cutting plan call for it and the saw’s setup is approved.
| Bar length | Situations to consider it | Check before choosing |
|---|---|---|
| 13 to 15 in | Smaller cuts or frequent limbing | Confirm the exact bar is approved and available for your mount |
| 16 to 18 in | General-purpose cutting | Confirm pitch, gauge, mount, and chain link count |
| 19 to 20 in | Larger cuts where added reach is useful | Confirm the manual permits it and the saw is in sound condition |
This is a selection guide, not a promise of cutting speed or capacity. A dull or poorly matched chain can make any bar feel wrong. Do not exceed the approved bar length for your specific saw configuration.
Match the bar to the task
Think about the cuts you make most often, rather than choosing the longest bar the saw can accept. If most work involves smaller limbs and shorter cuts, a long bar adds reach you may not need. If you regularly cut larger wood, a longer approved bar may be useful, but the chain must stay sharp and correctly tensioned.
I use one simple check when comparing two lengths: will the longer bar solve a real cutting need, or will it mostly add reach and handling demands? If the answer is unclear, compare the manual’s approved range and choose the shorter length that suits your regular work.
Verify fit before you install
A fitment check compares the replacement bar and chain with the saw’s actual parts before cutting. It can catch common buying errors, such as a mismatched mount or a chain with the wrong drive-link count. Do this check with the saw off and cool, following the manual’s instructions.
- Identify the saw and parts. Confirm the model and version from the saw’s identification information. Read the bar and chain markings. Check the drive-sprocket marking; do not rely only on an old online listing.
- Confirm the bar mount. Compare the replacement bar’s mount pattern with the saw. The bar must also align with the adjuster and oiling points as designed.
- Match pitch and gauge. The chain pitch must match the drive sprocket and bar tip sprocket. The chain gauge must match the bar groove.
- Confirm drive-link count. Use the count specified for the exact bar and sprocket setup. Do not assume all 16-inch or all 18-inch chains use the same count.
- Install and tension as directed. Follow the manual’s steps. With the chain brake released as directed, check that the chain moves freely by hand while wearing suitable gloves. Set tension to the manual’s specification.
Fitment scenarios, not universal recipes
These examples show how to make the decision; they are not fixed parts lists. A used 257 with an 18-inch bar may have a different sprocket or chain setup from another saw of the same model. Check the actual markings before ordering either replacement.
- Replacing a worn 16-inch bar: Keep the same length only if the mount matches and the new bar’s pitch and gauge suit the sprocket and chain. Confirm the required drive-link count for that bar.
- Moving from 16 to 18 inches: First check whether the manual approves the longer bar for your version. Then confirm bar mount, pitch, gauge, and the new chain’s drive-link count.
- Buying a used saw with unknown parts: Do not assume the installed setup is original. Identify the sprocket, bar, and chain separately, and replace mismatched or damaged parts before use.
If the markings are missing or hard to read, pause rather than guess. A Husqvarna dealer or a qualified saw shop can help identify the bar mount and chain setup from the saw and its installed parts.
Keep the matched setup safe and serviceable
Correct fitment is only the start. A matching bar and chain still need sound parts, correct tension, and working safety controls. Inspect the saw before each use, and follow the manual for fuel, chain oil, starting, and maintenance instructions.
Check the chain brake, throttle interlock, stop switch, chain catcher, bar, sprocket, and fasteners. Wear a helmet, eye and hearing protection, chainsaw leg protection, gloves, and boots. Check the work area, escape route, overhead hazards, and wood tension before cutting.
Start on stable ground with the chain brake engaged, as directed by the manual. Verify oil delivery using the manual’s check procedure, and make sure the chain stops at idle. Keep two hands on the saw, avoid pinching the bar, and keep the bar tip clear of wood. Contact with the upper quadrant near the tip can cause rapid kickback. Never cut above shoulder height.
Use the fuel mix specified in the manual. Husqvarna two-stroke oil is commonly specified at 50:1, but confirm the correct ratio for your saw and oil. Never use straight gasoline in this two-stroke engine or guess the ratio. Use suitable bar oil for the temperature, and confirm that oil reaches the chain.
Keep cutters evenly sharpened and set depth gauges to the chain maker’s specification. Clean the bar groove and oil holes, inspect the rails, and check the drive sprocket. Avoid fitting a new chain to a badly worn sprocket. After cutting, stop the saw, let it cool, and inspect chain tension and parts before the next job.
Frequently asked questions
What bar sizes fit a Husqvarna 257?
Bars are commonly listed from 13 to 20 inches, and 15 to 20 inches are frequently used. Confirm the approved range for your saw’s exact version in its manual.
What is a good general-purpose bar length?
A 16- to 18-inch bar is a practical general-purpose range when the manual approves it. Choose based on your usual wood and cutting tasks, not engine size alone.
Does every Husqvarna 257 use a 3/8-inch chain?
No. Many setups use 3/8-inch pitch, but you should confirm the drive-sprocket and chain markings. Match the chain to the sprocket and bar.
Is .058-inch chain gauge correct for the 257?
Many 257 setups use .058-inch gauge, but this is not guaranteed for every saw. Check the bar or chain marking and make sure the chain gauge matches the bar groove.
Can I use a 20-inch bar?
Only if the manual approves that length for your saw’s configuration and the mount, chain, and sprocket all match. Do not choose a 20-inch bar based on engine size alone.
How do I find the correct drive-link count?
Check the chain specification for the exact bar and sprocket setup, or count the drive links on a known-correct chain. Bar length alone does not give a reliable count.
Can I reuse my old chain with a new bar?
Only if its pitch, gauge, and drive-link count match the new bar and sprocket, and the chain is in serviceable condition. A worn or damaged chain should be replaced.
What if the markings on my bar are unreadable?
Do not guess. Check the chain and sprocket markings, consult the manual, or ask a qualified saw shop to identify the setup before buying parts.
Is a longer bar always better for larger wood?
No. A longer bar may provide useful reach, but wood type, chain condition, saw setup, and operator skill matter. Use only a length approved for your saw.
What should I check before cutting after a bar change?
Confirm the bar mount, chain pitch, gauge, and drive-link count. Set chain tension as the manual directs, check oil delivery, and inspect the safety controls before starting.
For the safest purchase, treat the model name as the start of the check, not the final answer. Confirm the approved bar length, then match the mount, pitch, gauge, and drive-link count to your saw’s actual parts. If one detail is unknown, verify it before ordering or cutting.
(This article was written by one of our staff writers, Marcus Thorne. Visit our Meet the Team page.)
