Can you measure a chainsaw chain with a ruler? Yes, you can measure a chainsaw chain using a ruler, but it’s not the most accurate method. To correctly measure a chainsaw chain, you need to know its pitch, gauge, and the number of drive links. This information is crucial for ensuring you purchase the correct chainsaw chain replacement and other chainsaw parts for your saw. Getting the chainsaw chain size right is vital for optimal performance and safety.
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Determining Your Chainsaw Chain’s Specifications
When it’s time for a chainsaw chain replacement, having the right information is key. You can’t just guess the chainsaw chain size; you need to know the exact measurements. This guide will walk you through how to determine chainsaw chain specifications accurately.
The Three Pillars of Chainsaw Chain Measurement
There are three primary measurements that define a chainsaw chain: pitch, gauge, and length (drive links). Each plays a critical role in how the chain interacts with the guide bar and engine.
1. Chainsaw Chain Pitch: The Distance Between Drive Links
What is chainsaw chain pitch? The pitch of a chainsaw chain is the distance between the rivets that join the chain together, measured from the center of one rivet to the center of the next. It’s a critical measurement because the sprocket on the saw’s clutch must match the chain’s pitch precisely. If the pitch is wrong, the chain won’t seat properly on the sprocket, leading to poor cutting performance, excessive wear, or even catastrophic failure.
Common Pitch Measurements:
- 1/4 inch (.250″): Often found on smaller, lightweight saws used for carving or detail work.
- .325 inch (.325″): Very common on a wide range of consumer and prosumer chainsaws.
- 3/8 inch (.375″): Popular on larger, more powerful chainsaws, offering good cutting speed and durability.
- .404 inch (.404″): Typically seen on professional-grade, heavy-duty chainsaws used for felling large trees.
How to Measure Pitch:
The most accurate way to measure a chain for a chainsaw is by looking for markings on the chain itself or by measuring the distance between drive links.
- Look for Markings: Many manufacturers stamp the pitch directly onto the chain. This is usually found on the drive links (the parts that sit on the guide bar). Look for numbers like “325” or “3/8”. Sometimes, it might be printed as a decimal, like “.325” or “.375”.
- Measure Between Drive Links: If there are no visible markings, you can measure.
- Count three rivets (which are essentially the centers of the links).
- Measure the distance from the center of the first rivet to the center of the third rivet.
- Divide that measurement by two.
- For example, if the distance is 1.5 inches (from rivet center to rivet center for three sections), then 1.5 inches / 2 = 0.75 inches. Convert this to a fraction: 0.75 inches is 3/4 of an inch. So the pitch is 3/8 inch.
Table: Common Chainsaw Chain Pitches
| Pitch (inches) | Pitch (mm) | Common Saw Types |
|---|---|---|
| 1/4 (.250) | 6.35 | Carving, small electric saws |
| .325 | 8.25 | Mid-size gas saws, homeowner saws |
| 3/8 | 9.52 | Larger gas saws, professional saws |
| .404 | 10.26 | Heavy-duty professional saws, felling |
2. Chainsaw Chain Gauge: The Thickness of the Drive Link
What is chainsaw chain gauge? The gauge of a chainsaw chain refers to the thickness of the drive links. These are the parts of the chain that fit into the groove of your guide bar. The gauge is critical because the drive links must fit snugly into the guide bar groove without being too loose or too tight. A proper fit ensures the chain is properly supported and guided as it moves around the bar.
Common Gauge Measurements:
- .043 inch (.043″): Often found on smaller saws with 1/4 inch pitch chains.
- .050 inch (.050″): The most common gauge, used with .325 inch and 3/8 inch pitch chains.
- .058 inch (.058″): Often paired with 3/8 inch pitch chains on more powerful saws.
- .063 inch (.063″): Used with larger pitch chains like .404 inch for heavy-duty professional applications.
How to Measure Gauge:
Measuring the gauge is best done with a ruler or caliper, or by checking chain packaging or markings.
- Check Chain Packaging or Old Chain: The gauge is usually printed on the packaging of a new chain. If you have an old chain, check its label or the chain itself for markings.
- Look for Markings on the Drive Link: Similar to pitch, the gauge is often stamped on the drive link. It might look like “050” for .050 inch or “063” for .063 inch.
- Measure with a Ruler (Less Accurate): If you have no other option, you can try to measure the drive link with a ruler.
- Find a drive link (the part that rides in the guide bar groove).
- Place a ruler against the side of this drive link.
- Measure the thickness. This measurement is small, so a precise ruler or caliper is best.
- Convert the measurement to inches and compare it to common gauges. For example, 1.27 mm is equivalent to 0.050 inches.
Table: Common Chainsaw Chain Gauges
| Gauge (inches) | Gauge (mm) | Common Pitch Ranges |
|---|---|---|
| .043 | 1.1 | 1/4″, .325″ |
| .050 | 1.3 | .325″, 3/8″ |
| .058 | 1.5 | 3/8″ |
| .063 | 1.6 | 3/8″, .404″ |
3. Chainsaw Chain Length: The Number of Drive Links
What is chainsaw chain length? The length of a chainsaw chain is determined by the number of drive links it has. Drive links are the parts of the chain that extend down into the guide bar groove and engage with the drive sprocket. The number of drive links must match the length of your guide bar and the drive sprocket’s capacity.
How to Measure Length (Count Drive Links):
This is the most straightforward measurement. You need to count the number of drive links on your chain.
- Lay the chain flat on a surface.
- Locate the drive links. These are the teeth that sit inside the guide bar groove.
- Count each drive link carefully. A drive link is the piece of the chain that has a downward tab fitting into the guide bar.
- Write down the total number of drive links.
How to Determine the Correct Number of Drive Links for Your Guide Bar:
The number of drive links needed is dictated by the length of your guide bar, but it’s not a direct 1:1 ratio. Manufacturers specify the correct chain length for a given guide bar size.
- Check Your Chainsaw Manual: The owner’s manual for your chainsaw will list the recommended guide bar lengths and the corresponding chain specifications (pitch, gauge, and number of drive links).
- Examine Your Current Chain: As mentioned, count the drive links on your existing chain. If it’s the correct chain for your saw, this number is your target.
- Look for Information on the Guide Bar: Sometimes, the guide bar itself might have a sticker or engraving indicating the compatible chain length or the number of drive links. However, this is less common.
Common Guide Bar Lengths and Corresponding Drive Link Counts (Examples):
- 14-inch guide bar: Often requires a chain with 52 or 53 drive links.
- 16-inch guide bar: Typically uses a chain with 56 to 58 drive links.
- 18-inch guide bar: May require a chain with 62 to 64 drive links.
- 20-inch guide bar: Commonly uses a chain with 66 to 68 drive links.
Important Note: These are just general examples. The exact number of drive links can vary between manufacturers and even between different models from the same manufacturer. Always confirm with your chainsaw’s manual or by counting the drive links on your current, correctly fitting chain.
Chainsaw Chain Identification: Decoding the Numbers
Many chainsaws and their chains have chainsaw chain numbers that can help you identify the correct specifications. These numbers are usually stamped directly onto the drive links or on the top of the cutting teeth.
Where to Find Chainsaw Chain Numbers:
- Drive Links: Look at the bottom part of the chain that sits in the guide bar groove.
- Top of Cutting Teeth: Sometimes, the pitch and gauge are stamped on the cutting teeth themselves.
Decoding Common Chainsaw Chain Numbers:
The chainsaw chain identification system can vary slightly by manufacturer, but there are common patterns.
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Oregon Chains: Oregon is a very popular aftermarket chain manufacturer. Their chains often have numbers that directly correspond to the pitch and gauge.
-
73LGX056E:
73: Represents 3/8 inch pitch.LG: Indicates a specific chain series or grind type (e.g., “LG” for low-vibration chisel, “LP” for low-profile chisel).X: Often denotes a semi-chisel or low-profile cutter.056: Represents 56 drive links.E: May indicate certain features like enhanced durability or specific oiling features.
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91PJXL052G:
91: Represents 3/8 inch Low Profile pitch (a smaller version of 3/8).PJ: Indicates a specific cutter type.XL: Represents a low-profile chain.052: Represents 52 drive links.G: May refer to a specific manufacturing or quality standard.
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Stihl Chains: Stihl often uses its own numbering system, but the pitch and gauge are usually indicated. You’ll often find these numbers stamped on the chain.
- A common Stihl chain might have markings like “3/8” and “.050” on the drive links. The total number of drive links will need to be counted.
General Tips for Identification:
- Match Pitch First: The pitch is the most critical measurement after gauge.
- Match Gauge Second: Ensure the drive link thickness is correct for your guide bar.
- Match Drive Link Count: The number of drive links must match your guide bar’s requirements.
- Consult Your Chainsaw Manual: This is your most reliable source of truth for the correct chainsaw chain size.
Why Accurate Measurement is Crucial
Getting the chainsaw chain size wrong can lead to several problems:
- Poor Cutting Performance: An incorrectly pitched or gauged chain won’t cut efficiently. It might snag, vibrate excessively, or even fail to cut at all.
- Damage to Your Chainsaw: A chain that is too loose can derail, potentially damaging the guide bar, clutch, or even the engine. A chain that is too tight can cause excessive wear on the drive sprocket and the chain itself.
- Safety Hazards: A poorly fitted chain can break apart or derail unexpectedly, posing a serious risk of injury to the operator.
- Reduced Chain and Bar Lifespan: Mismatched specifications accelerate wear on all components, shortening their useful life.
Tools for Measuring Chainsaw Chains
While a ruler can give you a rough idea, specialized tools offer better accuracy when you need to measure chainsaw chain specifications.
- Ruler or Measuring Tape: Useful for rough estimates of pitch if no markings are visible.
- Calipers (Digital or Vernier): Ideal for precisely measuring the thickness of the drive link (gauge) and the distance between rivets for pitch.
- Chainsaw Chain Gauge Tool: Some specialized tools are available that have built-in templates and guides to help you identify pitch and gauge.
- Manufacturer’s Specifications: Your chainsaw’s manual is the ultimate guide.
Practical Steps for Measuring Your Chain
Let’s walk through the process step-by-step to ensure you get it right.
Step 1: Identify Your Chainsaw Model
Before you even look at the chain, know your chainsaw’s make and model number. This information is usually found on a sticker on the saw’s body, often near the handle or the engine housing. With this information, you can usually find the correct chain specifications in your owner’s manual or by searching online on the manufacturer’s website or reputable parts retailers.
Step 2: Inspect the Existing Chain for Markings
Most chains have pitch and gauge information stamped directly onto the drive links or cutting teeth.
- Pitch: Look for numbers like “325” or “3/8” on the drive links.
- Gauge: Look for numbers like “050” or “058” on the drive links.
- Drive Links: You’ll need to count these manually (see Step 3).
Step 3: Count the Drive Links
This is a direct measurement.
- Remove the chain from the saw.
- Lay it flat.
- Carefully count each drive link – the portion that rides inside the guide bar groove.
- Record this number.
Step 4: Measure Pitch (If No Markings Exist)
If the pitch is not clearly marked, you’ll need to measure it.
- Take your ruler or calipers.
- Find three consecutive drive links.
- Measure from the center of the first rivet to the center of the third rivet.
- Divide this measurement by two. Convert the result to inches and identify the closest standard pitch (e.g., .325″, 3/8″).
Step 5: Measure Gauge (If No Markings Exist)
If the gauge is not marked, you can measure the thickness of a drive link.
- Use calipers for the most accurate reading.
- Measure the thickness of one of the drive links.
- Convert this measurement to inches (e.g., 1.3 mm is 0.050 inches).
Step 6: Cross-Reference and Purchase
Once you have your pitch, gauge, and drive link count, you can confidently purchase a new chainsaw chain replacement.
- Check your chainsaw manual: This is your primary reference.
- Use online resources: Many websites that sell chainsaw parts have lookup tools where you can enter your saw model to find compatible chains.
- Bring your old chain: If you’re unsure, take your old chain to a reputable chainsaw parts dealer. They can help you determine chainsaw chain specifications and find the correct replacement.
Common Mistakes to Avoid
- Guessing: Never guess the chainsaw chain size. Always measure or consult your manual.
- Assuming all chains of a certain length are the same: Guide bar length is a primary indicator, but pitch, gauge, and drive link count are specific to the chain itself and the saw’s drive sprocket.
- Ignoring the gauge: The gauge is just as important as the pitch. An incorrect gauge will not fit your guide bar properly.
- Confusing chain pitch with bar length: While related, they are not the same measurement. A 16-inch bar can use chains of different pitches and drive link counts depending on the saw’s design.
Frequently Asked Questions (FAQ)
Q1: How do I know if my chainsaw chain is worn out?
A1: Signs of a worn chain include dull cutters that require more force to cut, excessive vibration, loose chain that requires frequent tightening, and chains that appear stretched or have unevenly worn cutters. If your chain is consistently dulling very quickly after sharpening, it might be worn out.
Q2: Can I use a chain with a different pitch than what my saw requires?
A2: No, you absolutely should not use a chain with a different pitch. The pitch must match the drive sprocket on your chainsaw for safe and efficient operation. An incorrect pitch will cause damage and be a safety hazard.
Q3: What does it mean if my chain is constantly coming loose?
A3: This can indicate that the chain is worn and stretched, or it could mean the chain gauge is incorrect for your guide bar, causing it to not seat properly. It could also point to an issue with your saw’s chain tensioning system.
Q4: Are all chains for a specific guide bar length the same?
A4: No. While guide bar length is a strong indicator, chains for the same length bar can vary in pitch, gauge, and the number of drive links depending on the chainsaw’s model and intended use. Always verify all three specifications (pitch, gauge, drive links).
Q5: Where can I find my chainsaw’s model number?
A5: The model number is typically located on a sticker or plate on the chainsaw body. Look for it near the handle, on the engine housing, or on the side of the saw.
Q6: What are “drive links”?
A6: Drive links are the parts of the chainsaw chain that have a downward tab. These tabs sit in the groove of the guide bar and are engaged by the drive sprocket. The total number of drive links determines the chain’s length.
By following these steps, you can accurately measure a chain for a chainsaw and ensure you select the correct chainsaw chain size for your next chainsaw chain replacement. Proper chainsaw chain identification and measurement are key to maintaining your saw’s performance and your safety.