Whether you’re a professional lumberjack, an arborist, or a DIY homeowner, keeping your chainsaw in peak performance is crucial. One key factor is using the correct chain size for your saw. Measuring a chainsaw chain isn’t always intuitive, as it involves more than simply checking the length. This comprehensive guide details the precise steps, tools, and tips for measuring chainsaw chains, ensuring safety, efficiency, and the longevity of your equipment.
Critical Chainsaw Chain Measurements At A Glance
| Measurement Type | Description | How It’s Measured |
|---|---|---|
| Pitch | Distance between any three consecutive rivets, divided by two | With ruler/caliper, in inches (in), e.g., 3/8” |
| Gauge | Thickness of drive links, fits in guide bar groove | With caliper/ruler, in inches (in), e.g., 0.050” |
| Drive Link Count | Total number of drive links on the chain | Count each link |
| Chain Length | Determined by the bar length and above factors | Not measured end-to-end; calculated with bar info |
Why Proper Chainsaw Chain Measurement Matters
Using the correct chainsaw chain size is fundamental for safe and efficient operation. Incorrect sizing can lead to poor cutting performance, increased wear on the saw, and elevated safety risks, including kickback or chain derailment. By accurately measuring your chain, you optimize your equipment’s lifespan, ensure precise cuts, and maintain compliance with safety regulations.
Key Chainsaw Chain Sizing Terms Explained
Pitch
The pitch refers to the average distance between two rivets on the chain. This measurement determines how the chain links fit into the saw’s drive sprocket. Common pitches include 1/4”, 0.325”, 3/8”, and 0.404”. Always check your chainsaw manual or the original chain itself for manufacturer-recommended pitch sizes.
Gauge
Chain gauge is the thickness of each drive link, which must match the groove in the guide bar. Common gauges are 0.043”, 0.050”, 0.058”, and 0.063”. Using the wrong gauge can wear out your bar or cause the chain to slip off.
Drive Link Count
The drive links are the lower parts of the chain that slot into the guide bar groove. Chain length is typically described by its number of drive links. Proper count ensures the chain fits snugly around the bar and drive sprocket.
Overall Chain Length
Although the overall length is important, it is technically the resultant measurement from the correct pitch, gauge, and drive link count working together. Chains are generally matched to the advertised bar length (e.g., a “16-inch bar” usually takes a specific chain size).
How To Correctly Measure A Chainsaw Chain: Step-By-Step
Accurately determining your chainsaw’s chain size involves three primary measurements. Here’s a breakdown with actionable steps for each aspect:
Step 1: Measure The Pitch
- Lay The Chain Flat: Place the chain on a flat surface with the drive links visible.
- Locate The Rivets: Identify three consecutive rivets (the round pegs that hold the chain together).
- Measure Distance: With a ruler or caliper, measure from the center of the first rivet to the center of the third rivet.
- Divide By Two: Divide this measurement by two. For example, if the distance is 0.75”, the pitch is 0.375” or 3/8”.
Step 2: Measure The Gauge
- Clean The Chain: Wipe any debris or oil from a drive link for an accurate reading.
- Use A Caliper Or Chain Gauge Tool: Measure the thickness of a drive link.
- Compare To Standards: Refer to standard gauge sizes: 0.043”, 0.050”, 0.058”, or 0.063”.
Step 3: Count The Drive Links
- Count Each Link: Count all the drive links surrounding the chain (the sections of metal that fit in the groove).
- Accuracy Is Essential: Even one link off can prevent proper chain fitment.
Alternative Methods For Chain Sizing
Using Manufacturer Information
If you have the chainsaw’s owner’s manual or old chain packaging, it usually specifies the correct pitch, gauge, and drive link count for your model. Chainsaw manufacturers often use standardized codes or part numbers to reference chain sizes.
Consulting The Guide Bar
Many chainsaw bars have sizing information stamped on the side. Look for numbers indicating pitch, gauge, and drive link count (e.g., “3/8″ – .050″ – 56DL”). This can confirm your manual measurements and reduce error.
Bring The Old Chain To A Store
If in doubt, bring your old chain to a hardware store or specialized dealer. Store professionals can quickly identify the chain size using tools and reference charts, ensuring you leave with the correct replacement.
Common Chainsaw Chain Sizes For American Users
There is a wide spectrum of chain sizes across brands and models, but certain sizes are especially common in the US market for popular applications:
| Bar Length (inches) | Standard Pitch | Common Gauge | Drive Link Range |
|---|---|---|---|
| 12” | 3/8” Low Profile | 0.043”, 0.050” | 44–45 |
| 14” | 3/8” Low Profile | 0.050” | 50–52 |
| 16” | 3/8” | 0.050” | 55–57 |
| 18” | 0.325” or 3/8” | 0.050”, 0.058” | 62–72 |
| 20” | 0.325”, 3/8”, 0.404” | 0.050”, 0.063” | 70–81 |
Essential Tools For Measuring A Chainsaw Chain
Proper tools make measuring simple and accurate:
- Ruler Or Tape Measure: For pitch measurement, make sure markings are clear and precise.
- Caliper: Digital or manual calipers provide accurate gauge readings.
- Chain Gauge Tool: Some hardware shops provide plastic gauge cards for checking drive link thickness.
- Reference Charts: Printable or online charts help translate your measurements to chain part numbers.
Investing in these minor tools can save time and ensure the correct chain is always selected.
Visual Guide: Identifying The Right Chain On Your Bar
Some guide bars are etched/stamped with a series of numbers. Here’s how to interpret them:
- Pitch: Look for numbers like “3/8” or “.325”.
- Gauge: Indicated with decimals, “.050” or “.058”.
- Drive Links: “56DL” means 56 drive links.
If any number is missing or unclear, perform the manual measurements described above for best results.
Troubleshooting: Common Chainsaw Chain Sizing Mistakes
Choosing the wrong chain size can cause:
- Chain Too Short: Can’t wrap around bar/drive sprocket.
- Chain Too Long: Chain sags, may slip off during use.
- Incorrect Gauge: Chain wobbles, binds, or doesn’t move freely.
- Wrong Pitch: Won’t mesh with drive sprocket; won’t operate safely.
Avoid these problems by double-checking all three measurements and ensuring your bar and chain specifications match.
How To Match A New Chain To Your Chainsaw Bar
Matching Chain To Bar Description
Bar packaging typically details compatible chain specifications, including pitch, gauge, and recommended drive link count. Always cross-reference these numbers before buying a replacement chain.
Checking With Major Brands
- Stihl, Husqvarna, Echo, Poulan, Oregon, Craftsman, and others have online lookup tools on their official websites to confirm chain-bar compatibility via model numbers.
- Barcode stickers or QR codes on new bars and chains often provide easy access to digital resources or instructional videos.
Special Cases: Measuring Chainsaw Chain For Older And Vintage Models
Vintage chainsaws may not have accessible manuals or labeling. Manual measurement remains the gold standard here, as bar wear and changes in sprockets can alter recommended chain specs over time.
- Carefully remove the old chain and thoroughly clean it.
- Follow the 3-step process detailed earlier (Pitch, Gauge, Drive Link Count).
- Bring results to a specialty dealer, as home improvement stores may not stock these uncommon sizes.
Answers To Frequently Asked Chainsaw Chain Sizing Questions
What If I Only Know My Guide Bar Length?
While bar length provides a starting point (e.g., a “16-inch” bar), two chainsaws with 16” bars may use different pitch or drive link count. Never purchase solely by bar length—always confirm all three critical measurements.
Can I Swap A Chain With A Different Pitch Or Gauge?
No. Pitch and gauge must always match the guide bar and drive sprocket, or the chain will not operate properly, risking extreme damage and safety hazards.
How Often Should I Replace My Chainsaw Chain?
When cutters become too worn to sharpen, drive links show damage, or stretching causes poor tensioning, replace immediately. Using a worn or mismatched chain can destroy your saw’s bar or worse, cause injury.
Is It Safe To Size A Chain Without Professional Help?
Yes, if you follow detailed measurements and cross-check with manufacturer references. If unsure, bring the chain and/or bar to a professional retailer or service center for confirmation.
Tips For Maintaining Chain Life And Proper Fit
- Regularly Clean Bar And Chain: Prevents debris buildup and ensures correct fit.
- Lubricate Properly: Reduces friction and premature wear.
- Inspect Sprocket Wear: Out-of-spec sprockets may require chain compatibility checks.
- Sharpen Or Replace As Needed: Dull or stretched chains compromise safety and efficiency.
Where To Buy Replacement Chainsaw Chains In The US
- Local Hardware Stores: Most carry a range of sizes for common brands.
- Chainsaw Dealers And Service Centers: Personalized assistance and access to specialty sizes.
- Online Retailers: Amazon, Home Depot, Tractor Supply, and manufacturer websites offer wide selection and size reference tools.
Always double-check specifications against your measurements for proper fit.
Chain Numbering And Marking System Quick Reference
| Marking | Means | Significance |
|---|---|---|
| 91 | Oregon Low Profile 3/8” Pitch | Common on homeowner saws |
| 72 | Oregon 3/8” Pitch | Professional saws, 0.050” gauge |
| H78 | Husqvarna 0.058” Gauge Chain | Varies by bar/drive link count |
Quick Safety Tips When Changing Chainsaw Chains
- Disconnect Power Source: Remove battery or unplug electric saws before starting work. For gas saws, engage chain brake and remove the spark plug.
- Wear Gloves: Even dull chains are sharp enough to cut skin.
- Double-Check Chain Direction Upon Installation: Cutters should face forward on the top side of the bar.
- Test Tension: The correct chain will lift slightly from the bar and snap back easily; it should not sag or bind.
Summary: Why Precise Chainsaw Chain Measurement Is Essential
Measuring a chainsaw chain properly involves three critical elements: pitch, gauge, and drive link count. Using precise tools, consulting manufacturer data, and cross-referencing with bar information ensures a perfect fit—improving safety, operational efficiency, and extending equipment life. American chainsaw users can maximize reliability by following these clear, practical steps every time a chain replacement is needed.