Husqvarna 445 Bar and Chain (Fitment Guide)
For a Husqvarna 445, match the chain to the exact saw generation, bar mount, drive-sprocket pitch, bar groove gauge, and required drive-link count. Many North American setups use .325-inch pitch and .050-inch gauge, but those are not universal. Check the markings and your operator’s manual before buying; an 18-inch setup may use 72 drive links, but verify the bar.
Bar and chain choices can change as the 445 model is updated or sold in different markets. The reliable method has not changed: identify the saw and its current components, then match every fitment measurement. That small check can prevent a chain that will not fit, tension correctly, or run safely.
Equipment Setup and Safety Preparation
Fitment means that the chain matches the saw’s drive sprocket and the guide bar’s groove, length, and required link count. Before replacing parts, identify your exact 445 version and confirm its approved bar range in the operator’s manual. Treat the saw’s markings and manual as the final authority, not a listing that says only “fits 445.”
Identify the saw and its current setup
Look for the model and product information on the saw, then check the manual for that exact version and market. “445” alone is not enough to confirm fitment. If you have the manual, note the approved bar lengths and chain specifications before ordering.
Next, check the drive sprocket and the markings on the guide bar. The chain’s pitch must match the sprocket and bar nose; its gauge must match the bar groove. The bar’s required drive-link count must also match the chain. Pitch is the spacing measurement used to describe chain size; gauge is the thickness of the chain’s drive links where they sit in the bar groove.
| Fitment detail | What to confirm | Common reference, not a guarantee |
|---|---|---|
| Pitch | Sprocket, bar, and chain all match | .325 inch is common on North American 445 setups |
| Gauge | Chain drive links fit the bar groove | .050 inch (1.3 mm) is common |
| Bar length | Listed for your exact saw | 445 versions commonly allow about 13–20 inches; confirm the manual |
| Drive links | Exact count specified for your bar | Some 18-inch, .325-inch/.050-inch setups use 72 |
| Bar mount | Bar fits the saw’s mounting pattern and oiling layout | Confirm the part listing or manual |
A chain that matches only the bar length is not necessarily compatible. A pitch mismatch can prevent proper engagement; a gauge or link-count mismatch can stop the chain from fitting or tensioning correctly. Do not force it into place.
Check the bar and chain before purchase
Inspect the bar for its size and chain specifications, often stamped near the mounting end. If the stamp is worn or unclear, use the bar’s part number and confirm it with a dealer or parts catalog for your exact saw. Do not guess the link count from bar length alone; bar and chain designs can differ.
I often see a familiar shed-side mix-up: someone replaces a worn chain using only “18-inch” as the search term. The new chain looks close, but its link count or gauge differs from the bar. The fix is simple: read the bar marking, confirm the sprocket pitch, and check the chain’s drive-link count before buying.
Prepare the saw safely
Before removing or fitting parts, switch the engine off and let it cool. Wear gloves when handling the chain, and follow the manual’s instructions for the chain brake and side cover. Inspect the chain, bar rails, sprocket, chain catcher, brake, and fasteners. Replace damaged parts rather than trying to make them work.
For operation, use a helmet, eye and hearing protection, chainsaw-rated leg protection, gloves, and suitable boots. Check your footing, the work area, overhead hazards, and your escape route. Keep bystanders clear. Felling and complex cuts call for proper training and qualified help.
Next step: Write down the exact pitch, gauge, bar length, and drive-link count before ordering.
Field Cutting and Landscaping Operation
Once the replacement parts match, correct installation and tension are the next fitment checks. The chain should sit in the bar groove and engage the sprocket as designed. Follow the 445 manual for mounting and adjustment; a correctly sized chain can still be unsafe if it is damaged, fitted backward, or too loose.
Fit and tension the chain
With the engine off, release the chain brake as directed by the manual before adjusting the chain. Remove the side cover and fit the bar and chain according to the saw’s instructions. Confirm that the drive links sit fully in the bar groove and engage the sprocket. Check the chain’s cutting direction before closing the cover.
Adjust tension using the saw’s tensioning mechanism. The chain should sit snugly against the underside of the bar but remain movable by hand while wearing gloves. Use the manual’s method to check tension; do not rely on a quick tug alone. Tighten the bar fasteners as instructed, then recheck tension because tightening can change it.
If the chain will not move smoothly by hand, do not start the saw. Check that the brake is released for the inspection, the chain is correctly seated, and the tension is not excessive. If it hangs loose under the bar or can pull away from the rails, retension it before use.
Fill oil and fuel correctly
The chain needs bar-and-chain oil in its separate oil tank. Use oil intended for chainsaws, and check the oil level before cutting. Bar oil is not engine fuel, and four-cycle engine oil is not a substitute for two-stroke mix.
For gasoline mixed with suitable Husqvarna-branded or equivalent-quality air-cooled two-stroke oil, the specified ratio is 50:1 unless the manual for your exact saw says otherwise. That is 50 parts gasoline to 1 part two-stroke oil. Do not run straight gasoline. Measure the oil accurately and use fresh fuel prepared in a clean, approved container.
| Fuel amount | Two-stroke oil for 50:1 |
|---|---|
| 1 L gasoline | 20 mL oil |
| 1 US gallon gasoline | 2.6 US fluid ounces oil |
| 5 L gasoline | 100 mL oil |
Use the fuel type and handling instructions stated in your manual. Refuel outdoors or in a well-ventilated area, away from ignition sources. Let the saw cool before refueling.
Start and cut with the matched setup
Start the saw on firm ground, with the chain brake engaged, following the cold- or warm-start steps in the manual. Release the brake only when you are ready to cut. Hold the saw with two hands and keep the bar tip clear of wood, the ground, and nearby objects.
Contact with the upper quadrant near the bar tip can cause rapid rotational kickback, throwing the saw toward the operator. Do not cut with the tip unless you are trained and the task requires it. Never use a saw with a damaged or bypassed chain brake. Engage the brake when moving between cuts.
Next step: If tension changes quickly, the chain derails, or the bar does not receive oil, stop and inspect before continuing.
Maintenance, Sharpening, and Tuning
A correctly fitted chain still needs regular sharpening and inspection. File size and sharpening angles depend on the chain model, so identify the chain rather than assuming every .325-inch chain uses the same instructions. Use the chain maker’s chart for cutter angles and depth-gauge limits, and keep the bar groove and oil ports clear.
Find the right file and angle
The chain’s identity may be stamped on the drive links or shown on its packaging. Use that model information to find the maker’s sharpening instructions. Many .325-inch chains use a 3/16-inch (4.8 mm) round file, but this is not universal; do not select a file from pitch alone.
The top-plate angle is the angle across the cutter’s top edge. Other filing angles may also be specified. Follow the chain maker’s diagram and use a guide to keep the file consistent. A commonly seen depth-gauge setting is .025 inch (0.65 mm), but it is not a universal target. Set depth gauges to the specification for your chain, not by guesswork.
A sharp chain should cut with steady feed and produce chips appropriate to the wood and chain condition. If it makes fine dust, pulls to one side, or needs heavy pressure, stop and inspect the cutters, depth gauges, chain tension, and bar. Forcing a dull chain through wood strains the operator and equipment; it does not restore the edge.
Inspect the bar, sprocket, and operating speed
Clean the bar groove and oil holes when the chain is off. Check the rails for damage or uneven wear, and inspect the sprocket for wear according to the manual. Rotate or replace the bar only as its maker allows. Replace a chain or component that is cracked, damaged, or beyond its service limits.
Some 445 manuals list about 2,700 rpm at idle and 9,000 rpm at maximum power speed. Specifications can vary by version. Confirm the figures in the exact manual, and use a tachometer for engine tuning; do not adjust the carburetor by sound alone. If the saw idles with the chain moving or runs poorly after fitment, stop and have the issue checked.
| Symptom after fitting | Check first |
|---|---|
| Chain will not seat or tension | Pitch, gauge, drive-link count, chain direction |
| Chain loosens repeatedly | Seating, tension procedure, bar and sprocket condition |
| Chain runs dry | Oil level, oil ports, bar groove, oiler function |
| Saw cuts slowly or unevenly | Sharpness, cutter angles, depth gauges, bar condition |
| Chain moves at idle | Idle setting and saw condition; stop use until corrected |
Next step: Keep the chain model and its sharpening chart with the saw so file size and angles are easy to verify.
Storage and Seasonal Care
Storage care helps preserve the fitted bar and chain and makes the next setup check easier. After use, engage the brake, stop the engine, and let the saw cool. Clean away sawdust and oil around the cover, bar groove, and oil ports, then inspect for damage before storing.
After the chain cools, check its tension again. Tension can change during use, so adjust it only as the manual directs. Store the saw with the chain protected, and keep fuel handling and storage in line with the manual and local rules. Before the next outing, confirm the chain still matches the bar and sprocket, check both oil and fuel, and inspect the brake and chain catcher.
Quick fitment examples
These examples show how to verify common configurations; they are not a substitute for the bar stamp or manual.
| Saw-side information | Chain to verify | Decision |
|---|---|---|
| Bar marked .325, .050, 18 in | Same pitch and gauge, exact bar link count | 72 links is common for this setup; confirm the bar marking |
| Bar marked .325, .050, 16 in | Same pitch and gauge, exact bar link count | Do not infer count from the 18-inch example |
| Bar details missing or unreadable | Use bar part number and exact saw manual | Confirm with a qualified dealer before purchase |
| New bar differs from current bar | Match mount, oiling layout, approved length, pitch, gauge, and count | Verify the full combination, not just the saw name |
The lasting rule is straightforward: the 445 badge does not identify every fitment detail. Verify the actual saw version, bar, sprocket, and chain specifications as a set. That check, plus correct tension and sharpness, is the quickest route to a sound setup.
Husqvarna 445 Bar and Chain FAQs
These answers cover the most common fitment questions, but manuals and parts can vary by 445 generation and market. Confirm the specifications on your own saw and bar before ordering or operating. When markings conflict or cannot be read, pause and verify with a parts catalog or qualified Husqvarna dealer.
What chain pitch is common on a Husqvarna 445?
A .325-inch pitch is common on North American 445 setups. Check the drive sprocket and bar marking to confirm yours.
What chain gauge does a 445 use?
A .050-inch (1.3 mm) gauge is common, but the chain gauge must match the groove stamped or specified for your bar.
Can I fit any 18-inch chain to a 445?
No. It must match pitch, gauge, and the bar’s exact drive-link count. Some 18-inch .325-inch/.050-inch combinations use 72 links, but verify your bar.
What bar lengths fit a Husqvarna 445?
445 versions commonly accept bars around 13 to 20 inches. The approved range varies, so use the manual for your exact model and market.
What file size should I use for a 445 chain?
Identify the chain model first. Many .325-inch chains use a 3/16-inch (4.8 mm) round file, but the chain maker’s sharpening chart takes priority.
What sharpening angle should I use?
There is no safe angle to assume from “445” alone. Follow the instructions for the chain model, including its top-plate and other specified filing angles.
What is the correct fuel mix?
Use a 50:1 gasoline-to-quality air-cooled two-stroke-oil mix when specified for your saw. Do not use straight gasoline, bar oil, or four-cycle oil in the mix.
Can I use bar oil in the fuel tank?
No. Bar-and-chain oil goes in the separate chain-oil tank. Use suitable two-stroke oil for the fuel mixture.
How tight should the chain be?
Set it according to the manual: snug to the bar but movable by hand with gloves. Recheck after fitting and after the chain cools.
Why does my new chain not fit?
The pitch, gauge, drive-link count, chain direction, or bar mount may be wrong. Check each item against the bar, sprocket, and exact saw manual before trying again.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
