What Is Full-Comp Chain Cutter Spacing? (Drive Link Spacing)
Full-comp chain has a standard, closely spaced cutter pattern: usually one alternating left- or right-hand cutter every two chain pitches. That spacing describes cutter placement, not the chain’s drive-link count. Pitch measures the distance between rivets, while drive-link count determines chain length. To choose a replacement, match pitch, gauge, drive-link count, and cutter type to your saw and bar.
The useful number is two pitches: that is the usual interval between successive cutters on a full-complement chain. But “spacing” can be confusing because manuals also list pitch and drive-link count. Those are separate measurements. Mixing them up can lead to buying a chain that does not fit, even if its package mentions the same bar length.
What does full-comp chain cutter spacing mean?
Full-comp, short for full-complement, describes a common chain layout with cutters placed close together along the chain. The cutters alternate between left-facing and right-facing teeth, usually with each cutter about two chain pitches from the next. The exact link sequence can vary by chain model, so confirm it with the manufacturer.
A chainsaw chain includes cutting teeth, drive links, and connecting links. The drive links sit in the guide bar’s groove and engage the saw’s drive sprocket. The cutters remove wood; their pattern affects how often a cutter meets the wood as the chain travels around the bar.
Full-comp chains have more closely spaced cutters than skip chains. This usually gives a smoother, more continuous cut, but the greater number of cutters can also increase cutting load. That is why chain pattern must suit the saw and the bar, rather than being chosen by name alone.
“Full-comp” does not mean that every drive link is a cutter. Nor does it state how many drive links the chain has. Think of it as a description of the cutter pattern, not a measure of chain length.
How are cutter spacing, pitch, and drive-link count different?
Pitch is the chain size used to match the drive sprocket and bar nose. Cutter spacing describes how far apart cutters sit in the chain’s repeating pattern. Drive-link count is the total number of links that travel in the bar groove. These are related parts of chain selection, but none can replace another.
Pitch: Measure the distance between the centers of three consecutive chain rivets, then divide by two. Common examples include .325-inch and 3/8-inch low-profile pitch. The pitch must match the saw’s drive sprocket and the guide bar’s nose sprocket.
Cutter interval: On many full-comp chains, successive cutters sit about two pitches apart. For example, with .325-inch pitch, two pitch intervals equal .650 inch. This is a way to describe the usual pattern, not a substitute for the chain maker’s specification.
Drive-link count: Count the drive links that fit into the bar groove. This count determines the chain’s required length for that bar and saw setup. Do not calculate it from the bar’s stated length alone. Bars of the same length can require different drive-link counts.
| Specification | What it describes | Example or check |
|---|---|---|
| Pitch | Chain size at the rivets | .325 in. or 3/8 in. low profile |
| Cutter interval | Pattern between cutting teeth | Usually about two pitches on full-comp |
| Gauge | Thickness of each drive link | Common sizes: .043, .050, .058, .063 in. |
| Drive-link count | Chain length around the bar | Count links; verify the bar or saw specification |
| Cutter type | Tooth design and pattern | Match the chain model approved for the saw |
Gauge is the thickness of a drive link. It must fit the guide bar groove. A chain with the right pitch but the wrong gauge can still be incompatible. Likewise, the right pitch and gauge do not guarantee the right drive-link count.
How do I check the chain specifications?
Start with the saw’s manual, then check the guide bar markings and the chain packaging or manufacturer’s chain chart. Confirm pitch, gauge, drive-link count, and the approved cutter type. These details should agree with the exact saw and bar combination. Bar length alone is not enough to identify a replacement chain.
I explain the distinction this way when someone brings in a chain with a partly worn label: pitch and gauge describe fit, drive-link count describes length, and full-comp describes cutter layout. If one number is missing, it is safer to identify the bar and saw model or ask a dealer than to guess.
Before fitting a chain, inspect the bar rails and groove, sprocket, chain brake, throttle lockout, chain catcher, and lubrication system. Look for damaged cutters, worn drive links, burrs, or other signs of damage. Use the maker’s wear limits to decide whether a part needs replacement.
Depth gauges, also called rakers, control how deeply a cutter can bite. Set them to the chain maker’s specification and use the specified gauge tool. A .025-inch setting is common on some chains, but it is not a universal setting. Do not lower the rakers by guesswork; an incorrect setting can make a chain dangerously aggressive.
How do I match and install a full-comp chain?
Match the chain’s pitch to the drive sprocket and bar nose, its gauge to the bar groove, and its drive-link count to the bar specification. Also confirm the chain type is approved for the saw. Do not mix parts just because they appear close in size or are listed for the same bar length.
For a clear check, write down the saw model and the markings on the guide bar. Compare these with the chain maker’s compatibility information. If the markings are unreadable or the parts do not agree, pause and ask a qualified dealer to identify them.
When installing, follow the saw maker’s steps and orient the cutters in the specified direction. With the saw off and cool, adjust chain tension as directed. The drive links should remain engaged in the bar groove, and the chain should be movable by hand while wearing gloves. Do not use excessive tension to compensate for a worn or mismatched bar or chain.
| Situation | What to verify | Next step |
|---|---|---|
| Replacement chain has the right pitch | Gauge and drive-link count too | Do not install until all specifications match |
| Bar label gives a length only | Exact chain length remains unknown | Find the bar model or approved link count |
| Chain sits loose or binds | Tension, fit, and wear | Stop and recheck the maker’s instructions |
| Cutter spacing looks different | Chain model and cutter sequence | Compare with the chain manufacturer’s diagram |
These checks are more reliable than estimating spacing by eye. If a replacement chain’s cutter sequence differs from the old one, that alone does not prove it is wrong; chain models can use different link sequences. Verify the exact model and compatibility details.
How does full-comp compare with skip chain?
Full-comp chain usually places cutters closer together than skip chain. Skip chain has cutters farther apart in its pattern. The closer cutter pattern can provide a smoother, more continuous cut, while more cutters can increase the load on the saw. Use only a chain and bar combination approved for your powerhead.
| Chain pattern | Typical cutter layout | General point |
|---|---|---|
| Full-comp | Usually cutters about two pitches apart | Closely spaced cutters; often a smoother, more continuous cut |
| Skip | Cutters spaced farther apart | Fewer cutters along a given chain length |
| Exact sequence | Depends on chain model | Check the manufacturer’s diagram or specification |
This comparison does not mean one pattern is always better. The correct choice depends on the saw, bar, chain design, and intended use. Do not choose a pattern based on wood species alone, or assume a pattern is safe because it fits physically.
What should I check before cutting?
Full-comp spacing matters for identifying the chain, but safe cutting also depends on a sound saw, correct tension, sharp cutters, and working safety features. Before starting, check that the chain is properly installed and lubricated, the brake operates as intended, and the work area has a clear path for you to move away.
Wear a helmet with face and eye protection, hearing protection, chainsaw-rated leg protection, gloves, and suitable boots. Establish a clear work zone and an escape path appropriate to the task. Start the saw using the manufacturer’s approved procedure on stable ground.
Keep both hands on the saw and maintain secure footing. Keep the bar nose clear of people, objects, and unintended contact. Contact with the upper quadrant near the guide-bar nose can cause rotational kickback, which can propel the saw toward the operator. Avoid nose contact and do not cut above shoulder height.
Verify that oil reaches the chain as described in the saw manual. A chain that runs dry can be damaged. Do not force a dull or binding chain through a cut; stop and find the cause.
How do I maintain and store the chain?
A full-comp chain needs the same basic care as other chain patterns: regular checks for tension, sharpness, lubrication, and wear. Stop the engine, engage the chain brake, and let the chain cool before inspecting or adjusting it. Follow the saw and chain makers’ instructions for timing and methods.
After initial running, recheck tension as directed. Chain tension can change as it heats and cools, so check it during use according to the manual. Sharpen cutters evenly to the manufacturer’s specified angle and length. Check rakers at the specified interval and adjust them only with the correct gauge.
Clean the bar groove and oil passages. Inspect the rails, cutters, drive links, and chain for wear or damage. Replace parts that exceed manufacturer limits. Do not keep using a damaged chain, or try to correct a worn bar by overtightening the chain.
For storage, shut down the saw, engage the brake, and let the equipment cool. Clean the saw, bar, and chain, then store the chain protected and lightly oiled. Follow the powerhead maker’s instructions for fuel and seasonal storage.
Frequently asked questions
Does full-comp mean one cutter on every drive link?
No. Full-comp usually means cutters alternate sides at about two-pitch intervals. The exact link sequence depends on the chain model.
Is cutter spacing the same as chain pitch?
No. Pitch is based on the distance between rivets. Cutter spacing describes the interval between cutting teeth in the chain pattern.
Does drive-link count tell me the cutter spacing?
No. Drive-link count tells you the chain length. Check the chain model or maker’s specification for its cutter pattern.
Can I choose a chain by bar length alone?
No. Match pitch, gauge, and drive-link count to the saw and bar. Confirm that the chain type is approved for the setup.
Does a full-comp chain always cut faster?
No single pattern is best for every saw and task. Full-comp has more closely spaced cutters, but it can increase cutting load. Use the approved combination for your saw.
Is .025 inch the correct raker setting for every chain?
No. It is common on some chains, but raker settings vary. Follow the chain maker’s specification and use the correct gauge tool.
Can I use a chain with the correct pitch but a different gauge?
No. Pitch and gauge both need to match. Gauge must also fit the bar groove.
How can I tell if the chain is too loose?
Use the saw maker’s tension check. Drive links should stay engaged in the groove, and the chain should move by hand with gloves. Do not operate it if it is loose or binding.
What should I do if the bar markings are missing?
Identify the bar and saw model through the manufacturer or a qualified dealer. Do not guess at drive-link count from bar length.
Does a different-looking cutter sequence mean the chain is wrong?
Not by itself. Chain models can use different sequences. Verify the exact chain model and its compatibility with the saw and bar before use.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
