What Is A Tsumura Chainsaw Bar (Pitch & Gauge Chart)
A Tsumura chainsaw bar is a replacement guide bar that supports and guides the saw chain. To choose one, match four details: chain pitch, chain gauge, bar length, and drive-link count. Also confirm the saw’s bar mount, oil-hole and tensioner positions, and approved bar range. Tsumura specifications vary by model and market, so check the bar marking or catalog.
Could a bar look like it fits, yet still be wrong for your chain or saw? Yes. A length match alone does not prove compatibility, and a chain that fits the bar groove may still mismatch the sprocket.
I explain bar and chain fit as a set of linked measurements. In equipment lessons, I’ve found that checking them in order is clearer than trying to decode a product name all at once. Use the guide below as a selection aid, then confirm the exact combination in your saw’s manual and the Tsumura listing for that bar.
Tsumura Bar Setup: Pitch, Gauge, Length, and Safety Checks
A Tsumura bar is the guide bar between the saw powerhead and the cutting chain. Its job is to guide the chain and support it as it moves around the bar. The right replacement must match the chain, sprockets, and saw, not just the old bar’s visible length.
Tsumura makes replacement bars in different configurations. The brand name alone does not tell you the pitch, gauge, mount, or chain length. Availability also varies by model and market, so treat the bar’s stamp and the manufacturer’s catalog as the final references.
Tsumura chainsaw bar pitch and gauge chart
This chart summarizes common chain specifications. It is a reference to help you read labels, not a list of every Tsumura model or a guarantee that any one bar is available in every size.
| Chain pitch | Common gauge options | What must match |
|---|---|---|
| 1/4 in. | Check the chain and bar listing | Chain pitch, bar nose design, and drive sprocket |
| .325 in. | .043, .050, .058, or .063 in. where offered | Exact chain gauge and compatible bar |
| 3/8 in. low-profile | Commonly .043 or .050 in.; verify the exact chain | Low-profile chain and matching sprockets |
| 3/8 in. | .050, .058, or .063 in. where offered | Standard 3/8-in. chain and matching sprockets |
Pitch is the spacing used to describe the chain’s drive links and cutters. The chain pitch must match the drive sprocket and the bar’s nose sprocket, if the bar has one. Some bars have a solid nose instead. Never infer pitch from bar length.
Gauge is the thickness of the chain’s drive links, which sit inside the bar groove. The gauge must match the groove. Common gauges include .043, .050, .058, and .063 inch, but Tsumura options depend on the bar model. Read the marking or catalog rather than assuming a size is offered.
Usable bar length is the cutting length measured from the front of the saw body to the bar tip when the bar is installed. A printed length does not tell you how many drive links the chain needs. Confirm the exact drive-link count for the saw and bar combination.
How to identify the four fit details
Look for markings on the bar, chain box, or saw manual. A label may show pitch, gauge, and length, but formats differ. If a marking is worn or unclear, use the model numbers to check the relevant manuals or parts listings.
- Pitch: Match the chain to both the drive sprocket and bar nose arrangement.
- Gauge: Match the chain’s drive-link thickness to the bar groove.
- Length: Choose a length the saw maker approves for that model and intended use.
- Drive links: Use the exact count listed for the bar and saw combination.
There is no universal engine-size-to-bar-length rule. The saw maker sets the approved range based on that saw’s design and limits. A longer bar is not automatically a safe or suitable upgrade just because the chain can be found in that length.
Also verify the mount pattern, which is the shape and placement of the bar’s attachment slot and related features. Check that the oil holes line up with the saw’s oil outlet and that the tensioner pin fits the bar’s adjustment hole. A mismatch can prevent proper mounting, tensioning, or lubrication.
Illustrative installation checks
These are examples of how to work through fit, not reports of specific Tsumura models.
Example 1: The replacement has the same printed length. The owner sees the correct length on a Tsumura listing but has not checked the chain. Before buying, they confirm pitch, gauge, drive-link count, mount pattern, oil-hole position, and tensioner compatibility. If any detail differs, the bar is not confirmed as a fit.
Example 2: The chain fits the groove but not the drive sprocket. A chain’s gauge may suit the bar while its pitch does not match the saw’s sprocket. The owner checks the saw manual and chain markings, then matches both sprockets and the bar. This prevents treating one matching measurement as proof of full compatibility.
Key takeaway: Confirm all four chain and bar measurements, plus mount and oiling details, before installation. Use the saw maker’s approved bar range.
Field Cutting: Bar Selection and Controlled Operation
Bar selection affects the saw’s reach and the chain’s fit, but it does not replace safe technique or training. Choose only a combination approved for your saw and task. Before cutting, check the work area, footing, escape routes, and bystanders, then wear the required protective gear.
A bar’s nose deserves special care. Rotational kickback can happen when the upper part of the guide-bar nose touches wood or another object. The bar can rise sharply toward the operator. Keep the nose clear when possible, hold the saw firmly with both hands, and use a working chain brake. The brake is not a substitute for sound technique.
Before starting, wear a helmet with face and eye protection, hearing protection, chainsaw chaps, gloves, and protective footwear. Inspect the saw and chain, and follow its manual for cold or warm starting. Keep cuts within your skill and equipment limits. Felling trees or working at height calls for qualified procedures and training.
After installation, check that oil reaches the chain using the method in the saw manual. Do not guess at oil type, delivery rate, fuel mix, idle speed, maximum engine speed, or fastener torque. These are saw-specific instructions, not general Tsumura bar settings.
Key takeaway: A suitable bar is only one part of a safe cutting setup. Follow the saw manual and stay within your training.
Chain, Bar, and Saw Maintenance
Routine checks help spot poor fit, wear, or blocked oil passages before they cause trouble. Inspect the chain, bar, sprocket area, and controls according to the saw and chain makers’ instructions. The correct service interval and settings can vary by equipment.
With the engine stopped, inspect the bar groove and oil ports for packed debris. Check the rails for damage and look over the chain for wear. Clean the sprocket area as directed by the saw manual, and make sure the chain brake and chain catcher are in good condition.
Set chain tension according to the saw manual. If the chain is sharpened, check its depth gauges, also called rakers. These limit how much wood each cutter takes. A .025-inch setting is a common reference, not a universal target. Use the chain maker’s specification and the correct depth-gauge tool, especially after sharpening.
If lubrication seems weak, stop and check the oil supply and passages using the saw maker’s troubleshooting steps. Do not assume the bar is at fault or adjust flow based on a generic number. Fuel mix, oil type, delivery, engine speeds, and fastener torque all depend on the saw model.
Key takeaway: Clean and inspect the bar and chain, but use the saw and chain manuals for tension, sharpening, lubrication, and service values.
Storage and Seasonal Care
Good storage protects the chain and bar from damage and keeps the saw ready for its next use. Shut the engine off, allow hot parts to cool, and follow the saw manual for cleaning, fuel handling, and storage. Keep the chain covered when the saw is put away.
Before storage, clean the groove, oil ports, and sprocket area as directed. Inspect the bar rails and chain, and address damage before the next job. Retension only as the manual directs; chain tension can change as equipment cools or during use.
Fit a chain guard over the bar, store the saw where it is protected from damage, and handle or store fuel according to the saw maker’s instructions. Do not leave fuel or oil decisions to a generic seasonal rule.
Key takeaway: Store the bar and chain clean, protected, and serviced according to the saw manual.
Frequently Asked Questions
These short answers cover common Tsumura bar fit questions. Exact specifications depend on the bar, chain, and saw models, so verify numbers against their markings or official manuals before ordering or installing parts.
Is a Tsumura bar a chainsaw chain?
No. It is the guide bar that supports and guides the chain. The chain is a separate part.
How do I find the pitch of my Tsumura bar?
Check the bar marking or its catalog listing. Confirm that the chain pitch also matches the saw’s drive sprocket and bar nose.
What does gauge mean on a chainsaw bar?
Gauge refers to the thickness of the chain’s drive links. Those links must fit the bar groove.
Can I choose a chain by pitch alone?
No. You must also match gauge and drive-link count, and check the bar, sprockets, mount, tensioner, and oiling alignment.
Does the bar length determine chain length?
No. Bar length alone does not establish the required drive-link count. Use the count specified for your saw and bar combination.
Does a longer Tsumura bar fit if it mounts to my saw?
Not necessarily. Confirm the saw maker’s approved bar range, as well as chain and mounting compatibility.
Is .025 inch the correct depth-gauge setting for every chain?
No. It is a common reference, not a universal setting. Follow the chain maker’s specification and use a suitable gauge tool.
Are fuel mix and bar-oil settings part of the Tsumura bar specification?
No. Fuel mix, oil type and delivery, engine speeds, and fastener torque depend on the saw model. Follow its manual.
What should I check before using a newly installed bar?
Check chain direction, tension, oil-hole alignment, chain movement with the engine off and brake released, lubrication, brake, catcher, and controls.
Can I use the chain brake to prevent kickback?
A working brake is an important safety feature, but it does not replace a firm two-handed grip, safe technique, or keeping the bar nose clear.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
