24-Inch .404 Chainsaw Chain (Sizing Guide)
A 24-inch bar does not identify one universal .404 chain. Confirm that your saw allows a 24-inch bar, then match the chain’s .404-inch pitch to the drive sprocket, its gauge to the bar groove, and its drive-link count to the exact bar fitment chart. Check the chain type and manufacturer’s settings before buying, installing, or sharpening it.
Bar markings, stamped chain codes, and online fitment charts make it easier to identify parts than relying on memory. But those tools only help when you match the exact saw, bar, and chain. I use the same order every time: confirm the saw’s approved setup, read the bar, then verify the chain. That simple check can prevent a costly mismatch.
What a 24-inch .404 chain must match
A .404 chain is a loop of cutters and drive links made to run on a .404-inch-pitch drive sprocket. For a 24-inch bar, you must also match chain gauge and drive-link count. These three measurements identify fit; bar length alone does not.
Pitch is the distance between the centers of three neighboring chain rivets, divided by two. A .404-inch chain must run on a .404-inch sprocket. It will not fit correctly on a 3/8-inch or 3/8-inch low-profile sprocket.
Gauge is the thickness of the chain’s drive links, which sit inside the bar groove. Some .404 combinations use .063-inch gauge, but other gauges exist. Read the bar marking or its manual. Do not assume the gauge based on pitch or length.
Drive-link count is the number of links that project down into the bar groove. There is no universal count for every 24-inch bar. Bar design and mounting details affect the required loop length, so use the exact bar’s fitment chart or count the links on a correctly fitted chain.
| What to match | Where to verify | What must agree |
|---|---|---|
| Bar length | Bar marking or manual | 24 inches, if approved for the saw |
| Chain pitch | Chain package and sprocket marking | .404 inch at both chain and sprocket |
| Chain gauge | Bar marking or manual | Exact match to bar groove |
| Drive links | Bar maker’s fitment chart or installed chain | Exact count for that bar |
| Chain type | Saw and chain manuals | Approved cutter and safety design |
A bar marked “24 in” may not provide 24 inches of usable cutting length. The nose and setup affect the working reach. Buy by the part number and fitment information, not by measuring the bar and guessing the chain length.
Equipment Setup and Safety Preparation
Before fitting the chain, confirm that the saw maker approves the 24-inch bar and .404 chain combination. A 24-inch bar creates a high-load setup, often used with saws in the 70–90 cc range, but engine size is only a screening clue. It is not proof that a saw can safely run that equipment.
Start with the saw’s manual and parts information. Check the approved bar range, chain pitch, sprocket, and oiling system. A powerful engine does not override the maker’s limits. Wood type, bar design, chain type, oil delivery, and the saw’s condition also affect performance.
Before installation, wear chainsaw-rated leg protection, a helmet with visor and hearing protection, gloves, and protective footwear. Inspect the chain brake, throttle interlock, throttle return, bar rails, sprocket, chain, and oiling system. Clear the work area, control bystanders, and assess the tree or log for lean, bind, overhead hazards, and a safe escape route.
How to verify the bar and chain markings
Read the bar’s stamped or printed information. It may show length, pitch, gauge, and a part number. Use that part number in the bar maker’s fitment chart to confirm the drive-link count. If the markings are worn or missing, identify the bar by its full model information before ordering.
Check the chain package or maker’s chart for pitch, gauge, drive-link count, and chain type. All must match the saw and bar. If the saw has a replaceable sprocket, inspect its marking or verify the part number in the saw’s parts list. Do not install a .404 chain on a 3/8-inch sprocket.
A careful installation sequence
Set the saw on a stable surface, switch it off, allow hot parts to cool, and prevent accidental starting as directed in the manual. Engage the chain brake before handling the chain. Loosen the bar nuts and release chain tension using the saw maker’s procedure.
Fit the chain so the drive links enter the bar groove and the cutters face in the correct direction on the top run. Seat the bar and chain on the sprocket, then adjust tension as the manual specifies. The chain should sit in the groove and move by hand with appropriate resistance; follow the maker’s exact tension check rather than relying on a generic gap.
Tighten the bar nuts to the specified method and torque, if given. There is no universal torque value for every saw. Recheck tension after tightening and again after the first short period of use, following the manual. A chain that is too loose can derail; one that is overtightened can cause excess wear.
Field Cutting and Landscaping Operation
A correctly sized chain still depends on a sound saw and a controlled work area. Start the saw using its cold- or warm-start procedure, on stable ground, with the brake engaged and the bar clear. Check that the chain stays still at idle, the brake works, the throttle returns, and oil reaches the chain.
If the chain moves at idle, the oil supply is absent, or a control fails, stop and correct the problem before cutting. Use a two-handed grip and secure stance. Keep the upper quadrant of the bar nose clear of unintended contact: contact there can cause rotational kickback, which drives the bar up and back toward the operator. A longer bar does not remove that risk.
Large-diameter wood, hardwood, and long cutting sessions increase load. Do not force a dull chain through a cut. It can cut poorly and strain the saw. Stop if the chain binds or the workpiece shifts; reassess the cut and support before continuing. Felling and other high-consequence work require suitable training, site assessment, and compliance with ANSI Z133 and applicable OSHA 29 CFR 1910.266 requirements.
Fitment examples: what to check before buying
These are fitment scenarios, not claims about a particular saw model. In each case, the manufacturer’s exact chart decides whether the setup is allowed.
| Scenario | Check first | Decision |
|---|---|---|
| Bar marking shows 24 in, .404, and a gauge | Confirm the saw permits that bar and find the exact drive-link count | Buy only a chain matching all listed values |
| Chain is .404 pitch, but the saw’s sprocket is marked 3/8 | Verify the sprocket part number and approved options | Do not install the chain on that sprocket |
| A replacement chain matches pitch but not bar gauge | Read the bar groove specification | Reject it; pitch does not compensate for wrong gauge |
| Existing chain fits, but its markings are unreadable | Count its drive links and identify the bar model | Confirm the count against the bar chart before ordering |
| Saw accepts 24 in, but oiling is weak or bar rails are damaged | Inspect and service the oiling system and bar | Repair first; approved length does not mean the saw is ready |
The most common ordering mistake is matching only “24 inch” and “.404.” I treat those as two checks, not a complete specification. Gauge and drive-link count still decide whether the loop fits and runs in the bar.
Maintenance, Sharpening, and Tuning
Sharpening settings depend on the exact chain design, not just its .404 pitch. Use the chain maker’s specified file diameter, filing angle, cutter length guidance, and depth-gauge setting. A common depth-gauge value such as .025 inch is not universal and should not be copied to every .404 chain.
A file that is too large or too small can change the cutter shape. Find the chain’s model or identification code on its packaging or in the maker’s chart. If the code is gone, compare the chain with the maker’s diagrams or ask a qualified parts supplier to identify it before sharpening.
Keep cutters even in length and angle, and set depth gauges only to the chain maker’s instructions. Incorrect depth-gauge clearance can lead to poor cutting or aggressive grabbing. If cutters are damaged, uneven, or beyond the maker’s limits, replace or have the chain serviced rather than removing more metal by guesswork.
Clean the bar groove, oil holes, and sprocket area during service. Inspect rails for damage and check that the chain receives bar oil. Use suitable chainsaw bar-and-chain lubricant; do not substitute a generic oil setting for the saw maker’s instructions. Fuel mix, idle speed, maximum RPM, fastener torque, and oil flow are all model-specific. Use the specified two-cycle oil ratio and never run a two-stroke saw on straight gasoline.
Storage and Seasonal Care
For storage, clean the chain, bar groove, oil holes, and air intake, then inspect parts for wear or damage. Follow the saw maker’s instructions for fuel, chain tension, and storage protection. Keeping the chain clean and the bar serviceable makes the next fitment check easier, but storage does not replace inspection before use.
Before the next job, verify chain pitch, gauge, drive-link count, and tension again. Check the brake, throttle controls, and oil delivery, then start and test the saw as directed. Do not use a chain that is cracked, badly damaged, or a poor fit, even if it worked previously.
Frequently asked questions
These short answers cover the checks most likely to resolve a fitment question. The saw, bar, and chain makers’ current instructions take priority where a model-specific value is needed. Use the exact part information rather than assuming every 24-inch .404 setup shares the same chain length or service settings.
What chain fits a 24-inch .404 bar?
The chain must have .404-inch pitch, the exact gauge listed for the bar, and the drive-link count in that bar’s fitment chart.
Is every 24-inch .404 chain the same length?
No. Drive-link count varies by bar model. Check the bar’s part number or count a correctly fitted chain and verify it with the maker’s chart.
Can I use a .404 chain on a 3/8-inch sprocket?
No. Chain pitch must match sprocket pitch. Do not fit a .404 chain to a 3/8-inch or 3/8-inch low-profile sprocket.
Is .063-inch gauge always correct for .404 chain?
No. Some .404 combinations use .063-inch gauge, but other gauges exist. Match the chain gauge to the bar groove marking or manual.
Can my saw run a 24-inch bar because it has a large engine?
Engine size alone does not establish approval. Check the saw maker’s approved bar range and requirements for chain, sprocket, and oil delivery.
What file size and sharpening angle should I use?
Use the chain maker’s specification for the exact chain type. Pitch alone does not identify the correct file size or filing angle.
Is .025 inch the right depth-gauge setting?
Not for every chain. Set depth gauges to the chain maker’s specification; .025 inch is common on some chains, not a universal setting.
Can I use a generic fuel ratio?
No. Use the fuel-and-oil ratio specified for your saw model and the two-cycle oil it requires. Never use straight gasoline in a two-stroke saw.
How can I tell whether the chain is getting oil?
Follow the saw manual’s oil-delivery check. If oil is not reaching the chain, stop and service the system before cutting.
What should I confirm before the first cut?
Check fitment and tension, brake and throttle function, chain movement at idle, and oil delivery. Stop if a control is defective or the chain moves at idle.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
