.325 Chainsaw Chain Pitch (Sizing Guide)
A .325-inch chain has a pitch of 0.325 inches (8.255 mm), measured across three rivet centers and divided by two. That measurement alone does not tell you which chain fits. Match the saw’s drive sprocket, bar pitch and gauge, and the chain’s drive-link count. Check the saw and bar markings or the maker’s parts chart before buying or fitting a chain.
A chain pitch is like one piece of a key: it must line up with the other parts to work. I’ve seen owners bring in a chain marked “.325” that still would not fit their saw. The cause was often a gauge or drive-link mismatch, not the pitch. Use this guide to check each size before you install a chain or head out to cut.
.325 Chain Fitment: Bar, Sprocket, Gauge, and Drive Links
This section explains how to match a .325-inch chain to the parts that guide and drive it. Pitch, gauge, and drive-link count each describe a different part of the fit. Confirm all three, along with the saw and bar model, rather than relying on a single number or the bar’s length.
What .325-inch pitch measures
Pitch is the distance between the centers of any three consecutive chain rivets, divided by two. On a .325-inch chain, that result is .325 inch, or 8.255 mm. The drive sprocket, guide bar, and chain must be specified for the same pitch.
The rivets are the round pins that join the chain links. Measuring a single gap between two rivets is not the standard method. In practice, the easiest check is to read the pitch marked on the bar or chain package and confirm it in the saw maker’s parts information. Do not choose a chain from a visual estimate.
Gauge and drive-link count
Gauge is the thickness of each chain drive link where it sits in the guide-bar groove. Common gauges for .325-inch chains include .050, .058, and .063 inch. These are different sizes, not alternatives that can be swapped at will. A chain that is too thick will not fit the groove; one that is too thin may not be supported correctly.
Drive-link count is the number of links that run inside the bar groove and engage the sprocket. It must match the specific bar and saw combination. Bar length alone does not determine the count, because bar designs and saw models vary. Check the bar marking, the chain package, or the manufacturer’s parts chart.
| Check | What to match | Where to verify |
|---|---|---|
| Pitch | .325 in on chain, bar, and drive sprocket | Saw or bar marking; maker’s parts chart |
| Gauge | Chain drive-link thickness and bar groove | Bar marking; chain specifications |
| Drive-link count | Exact count for the bar and saw combination | Bar marking or parts chart |
| Bar mount and oiling | Bar fit and oil passage alignment | Saw manual and bar specifications |
| Chain type | Approved chain design for the saw | Saw maker’s manual or approved parts list |
The bar mount and oiling ports matter too. A bar that fits the saw’s studs may still have an oil passage that does not align as intended. Likewise, the saw’s drive sprocket must support the chain pitch. Use combinations approved for your model, including the bar length and chain type. There is no universal rule that engine size alone tells you which bar will fit.
Shop scenarios: two common sizing mistakes
These are illustrative fitment scenarios, not a claim about a particular saw model. In the first, an owner brings a .325 chain with the correct pitch but a different gauge from the bar. The chain does not fit the groove correctly. The fix is to identify the bar’s specified gauge and obtain the matching chain, rather than forcing the links into place.
In the second, the pitch and gauge match, but the replacement chain has the wrong number of drive links. It cannot be tensioned properly on that bar. I check the bar marking and parts chart before opening a package; it takes less time than trying to make an incorrect chain work. Takeaway: confirm pitch, gauge, and drive-link count as a set.
Equipment Setup and Site Safety Before Cutting
Correct sizing is only the start. Before fitting or running a chain, inspect the saw, bar, sprocket, safety controls, and lubrication system. Work with the engine stopped and cool, follow the model’s manual, and use the protective equipment and site checks required for the task.
Fit the chain and set tension
- Stop the engine, let the saw cool, and engage the chain brake as directed by the manual. Wear gloves when handling the chain.
- Confirm the chain’s pitch, gauge, and drive-link count against the bar and saw. Check that the bar mount and oiling ports suit the saw.
- Fit the chain in the bar groove with the cutters facing the correct direction. On the top run of the bar, the cutting edges should face toward the bar nose. If unsure, compare with the manual’s diagram.
- Refit the cover and set tension according to the saw maker’s instructions. Do not use a generic tension measurement in place of model guidance.
- With the engine off and gloves on, check that the chain moves by hand as directed in the manual and sits correctly in the groove. Tighten the bar nuts to the specified torque if the manual provides one.
Inspect the bar rails, chain links, sprocket, chain brake, throttle lockout, and chain catcher. Stop if parts are damaged, badly worn, or not working as intended. Fill the fuel tank with the engine maker’s specified premix and fill the oil tank with suitable bar-and-chain oil. Fuel ratios, oil recommendations, and fastener torque values depend on the model, so check the manual rather than guessing.
Before starting, put on a helmet with face and eye protection, hearing protection, chainsaw-resistant leg protection, gloves, and boots. Check the work area for bystanders, overhead hazards, and a clear escape route. Follow applicable workplace rules and ANSI Z133 requirements where they apply. Takeaway: do not start until fitment, controls, protection, and the cutting area have all been checked.
Field Cutting, Sharpening, and Chain Tuning
A correctly sized chain still needs to be sharp, lubricated, and used within the saw maker’s limits. Sharpening angles, file diameter, depth-gauge settings, and engine tuning vary by chain and saw. Use the chain maker’s instructions for filing and the saw maker’s manual for fuel, operating limits, and service settings.
Sharpen to the chain’s specifications
Use the file diameter, filing angle, and cutter-length guidance listed for the exact chain. A .325-inch pitch does not, by itself, specify the correct file size or sharpening angle. Similar-looking chains may have different cutter designs. Check the chain package, chain maker’s chart, or saw manual before filing.
Keep the file positioned to the specified angle and height, and use even strokes across cutters on both sides. If cutters are badly damaged or uneven, follow the chain maker’s limits or have the chain assessed by a qualified service shop. Do not compensate for a dull chain by pushing harder; stop and sharpen or replace it as needed.
Depth gauges, also called rakers, control how much wood each cutter can take. Set them using the chain maker’s specified clearance and a matching depth-gauge tool. A clearance of .025 inch (0.635 mm) is common on some chains, but it is not a universal setting. Too much or too little can affect cutting behavior, so do not apply that number without checking the chain specification.
Confirm lubrication and operating condition
Before cutting, follow the manual’s start procedure on stable ground, with the chain brake engaged as directed. Once the saw is running, check that it idles steadily and that the chain receives oil using the maker’s recommended check. If oil delivery is absent or uncertain, stop and diagnose the oil supply before cutting.
Use two hands and a firm stance. Keep the bar nose clear of objects, and do not cut above shoulder height. Contact with the upper quadrant of the guide-bar nose can trigger rotational kickback and cause severe injury. A chain brake is an important safety device, but it does not replace safe technique, a secure grip, and control of the bar nose.
Use only a bar length and chain type approved for the saw, and do not exceed its stated limits. Fuel mix, idle speed, and maximum engine speed are model-specific. Do not adjust carburetor settings from generic figures; use the maker’s service information or a qualified technician. Takeaway: match sharpening and tuning settings to the exact chain and saw, not just the .325 pitch.
Shutdown, Cleaning, and Seasonal Storage
After cutting, stop the saw and let it cool before cleaning or inspection. Chips, dirt, and wear can hide fitment or lubrication problems, so check the chain and bar before the next use. Follow the manual for tension checks, fuel handling, and storage; those steps can vary among saw models and fuel systems.
Engage the chain brake, shut off the engine, and allow hot parts to cool. Clean chips from the bar area and inspect the cutters, drive links, bar groove, and oil delivery. Check chain tension and adjust it only as the manual directs. If the chain has damage, unusual wear, or does not move and seat correctly, do not return the saw to service until the cause is addressed.
For storage, guard the chain and handle fuel as instructed in the saw manual. Clean and protect the bar and chain as the maker recommends. At the next setup, recheck the chain’s pitch, gauge, drive-link count, and tension rather than assuming the previous fit remains correct.
The quick sizing rule is simple: match .325-inch pitch across the chain, bar, and drive sprocket, then confirm gauge and drive-link count for the exact saw-and-bar combination. Those checks prevent a pitch-only purchase from becoming an unsafe or unusable fit.
Frequently asked questions
Does .325 mean the chain will fit any .325 saw?
No. The pitch must match, but the gauge, drive-link count, bar mount, oiling ports, and approved saw setup must also match.
How do I measure .325-inch chain pitch?
Measure from the center of one rivet to the center of the third consecutive rivet, then divide that distance by two. The resulting pitch is .325 inch, or 8.255 mm.
Is .325 pitch the same as .325 gauge?
No. Pitch describes spacing based on rivets. Gauge is the thickness of the drive links that fit in the bar groove.
Which gauges are used with .325 chains?
Common options include .050, .058, and .063 inch. They are not interchangeable; use the gauge specified for your bar and chain.
Can I work out drive-link count from bar length?
Not reliably. The count depends on the specific bar and saw combination. Read the bar marking or check the manufacturer’s parts chart.
Does every .325 chain use the same file size and angle?
No. File diameter and sharpening angles depend on the chain design. Check the chain maker’s filing instructions for the exact chain.
Should I set every .325 chain’s depth gauges to .025 inch?
No. That setting is common on some chains, but the correct clearance is chain-specific. Use the specified depth-gauge tool and instructions.
Can I use a different bar length if the chain pitch matches?
Only if the saw maker approves that bar length and combination. Pitch alone does not establish that a bar is suitable for the saw.
What fuel ratio should I use with a .325 chain?
Chain pitch does not determine the fuel ratio. Use the engine maker’s specified mix; 50:1 is common, but it is not universal.
What should I do if the chain fits the pitch but will not tension?
Stop and check the drive-link count, gauge, bar, and saw combination against the bar marking and parts chart. Do not force or modify the chain to make it fit.
(This article was written by one of our staff writers, David Hensley. Visit our Meet the Team page.)
