How to Accurately Measure Your Chainsaw Chain: A Comprehensive Guide

A chainsaw is a powerful and indispensable tool for many homeowners and professionals alike. From pruning trees and clearing brush to cutting firewood, it tackles tough jobs with efficiency. However, like any mechanical tool, its performance relies heavily on maintenance, and one of the most crucial aspects of chainsaw upkeep is understanding and replacing the chain when necessary. Knowing how to accurately measure your chainsaw chain is paramount for ordering the correct replacement, ensuring optimal performance, and preventing potential damage to your saw. Using the wrong chain can lead to poor cutting performance, increased wear and tear, and even safety hazards. This comprehensive guide will walk you through the process step-by-step, ensuring you can confidently measure your chain and choose the right replacement.

Why Accurate Chainsaw Chain Measurement Matters

Before we delve into the how-to, let’s quickly touch on why this is so important. Chainsaw chains are designed to work precisely with the specific bar they’re paired with. Using the wrong chain can lead to several issues:

• Poor Cutting Performance: An ill-fitting chain might not engage correctly with the wood, resulting in slow, inefficient, and frustrating cutting.
• Increased Wear and Tear: A chain that is too tight or too loose can strain the bar, sprocket, and the chain itself, leading to premature wear and damage to your equipment.
• Safety Risks: An improperly fitting chain can potentially jump off the bar during operation, causing serious injury.
• Damage to the Chainsaw: Improper fitment of the chainsaw can affect the bar and the clutch as well.

Therefore, correctly measuring your chainsaw chain is not just about convenience; it’s crucial for safety, performance, and the longevity of your equipment.

Understanding the Key Measurements

A chainsaw chain isn’t just a loop of metal; it has specific characteristics that determine its compatibility with your chainsaw. Here are the key measurements you need to understand:

1. Pitch: The pitch is the distance between any three consecutive rivets divided by two. It’s a crucial measurement that defines the size of the chain’s drive links and how they interact with the sprocket. Common pitches include 1/4″, .325″, 3/8″, and .404″.
2. Gauge: The gauge refers to the thickness of the drive links where they fit into the bar groove. This measurement is vital for ensuring the chain sits correctly within the bar. Common gauges include .043″, .050″, .058″, and .063″.
3. Drive Link Count: The drive link count is the total number of drive links on the chain, also sometimes referred to as ‘chain count’. These are the links that engage with the chainsaw’s sprocket and guide the chain around the bar.

Methods for Measuring a Chainsaw Chain

There are two primary methods for measuring your chainsaw chain: measuring your existing chain or measuring based on the bar and manufacturer information.

Method 1: Measuring Your Existing Chain

This is the most reliable method if you have an old chain that is still in relatively good condition. It allows you to measure the existing pitch, gauge, and count of the chain. Here are the detailed steps:

Step 1: Gather Your Tools

You’ll need the following:

• The existing chainsaw chain
• A ruler or measuring tape (preferably metric for better accuracy)
• A magnifying glass (optional, but helpful for seeing small measurements)
• A notebook and pen or a camera to record the findings.

Step 2: Measure the Pitch

As mentioned before, the pitch is the distance between any three consecutive rivets divided by two. Follow these steps:

1. Locate three consecutive rivets: Identify three rivets in a row on the chain. These are the small, round pins that hold the chain links together.
2. Measure the distance: Using your ruler or measuring tape, measure the distance from the center of the first rivet to the center of the third rivet. Do this in millimeters for the greatest accuracy.
3. Divide by two: Divide the measurement you just took by two. This resulting number is your chain pitch. For example, if the measured distance between the three rivets is 16mm, the pitch will be 8mm. This translates to 0.325” if converting to inches.
4. Note the Measurement: Once you have the pitch, write down this crucial measurement.

Note: The pitch may be embossed onto the bar of the chainsaw; however, it is important to physically measure it to confirm this value.

Step 3: Measure the Gauge

The gauge is the thickness of the drive links. Here’s how to measure it:

1. Locate the drive link: Find one of the drive links on the chain. These are the small metal tabs that fit into the groove of the guide bar.
2. Measure the thickness: Using your ruler or measuring tape, carefully measure the thickness of the drive link where it fits into the guide bar groove. This is a small measurement, so be as precise as possible. Use a ruler with mm measurements for more accuracy, or a Vernier Caliper for high precision.
3. Note the measurement: Record the thickness of the drive link. The result will likely be in the range of .043”, .050”, .058”, or .063”.

Step 4: Count the Drive Links

The last crucial measurement is the total number of drive links:

1. Start counting: Choose a drive link and begin counting. It’s best to start with a link near the joining rivet to avoid losing your place.
2. Count accurately: Count each drive link all the way around the chain, making sure you don’t miss any or count any twice. Pay close attention to where you start to avoid double counting.
3. Record the total: Write down the total number of drive links you counted.

Step 5: Confirm all Three Measurements

After all the measurements have been taken and recorded, double-check them against each other for errors and confirm the values. This will ensure you have an accurate representation of the chainsaw chain to use for ordering a new one.

Method 2: Measuring Based on Bar and Manufacturer Information

If you don’t have an old chain or if it’s severely damaged, you can still get the necessary measurements using the bar and manufacturer information. However, this method is less reliable than measuring an existing chain, and should be carefully verified with a second method. Here’s how to do it:

Step 1: Identify your Chainsaw Model

The first step is to identify the model number of your chainsaw. This is usually found on a label on the chainsaw body, near the engine or the handle, on the packaging materials or in the owner’s manual. Look for a plate or sticker with this information and write it down.

Step 2: Locate the Bar Information

The chainsaw bar itself often contains crucial information. Check the bar for any markings, stickers, or engravings. Look for:

• Bar Length: This is often printed in inches (e.g., 16″, 18″, 20″). While this doesn’t directly tell you the chain size, it is a necessary factor.
• Gauge: The gauge is sometimes stamped on the bar itself. Look for a number like .043, .050, .058, or .063 (sometimes expressed in thousandths of an inch, i.e., 43, 50, 58, or 63).
• Pitch: The pitch can be present on some bars, usually expressed as fractions of an inch or as a decimal, e.g., 1/4”, .325”, 3/8”, or .404”.
• Chain Drive Link Count: Some bars provide the required drive link count based on the pitch and gauge, usually presented as a number.

If this information is available, carefully note it down. It’s important to make sure you note the units, as some manufacturers may use decimal places and others may use fractions or whole numbers.

Step 3: Consult the Chainsaw Manual

The owner’s manual for your chainsaw is an invaluable resource. Consult it for the specific chain requirements for your saw model. Look for sections related to:

• Chain Specifications: The manual will usually list the recommended pitch, gauge, and drive link count for the chainsaw model.
• Replacement Parts: Some manuals may even list specific part numbers for compatible chains.

Step 4: Check Manufacturer Websites

If you don’t have the manual or the information isn’t clear, try checking the manufacturer’s website. Most manufacturers have comprehensive parts lists and specifications for their products. Navigate to your chainsaw’s model page and look for chain specifications or part recommendations.

Step 5: Contact an Authorized Retailer

If all else fails, reach out to an authorized retailer. They will have access to databases and tools to identify the correct chain based on your chainsaw’s model number.

Step 6: Verify Information if Possible

Once you’ve gathered the necessary information from either the bar, the manual, the manufacturer’s website or a retailer, it’s important to try to verify this information by cross-referencing it if possible. Measuring an old chain or by getting a second opinion from a different retailer are good ways to verify the information.

Common Chain Sizes and Their Uses

Understanding the most common chainsaw chain sizes can also help you to choose the correct replacement:

• 1/4″ Pitch: Often found on small, light-duty chainsaws used for pruning and smaller trimming. This pitch is not designed for heavy duty cutting.
• .325″ Pitch: A common pitch for mid-sized chainsaws used for a variety of tasks, including felling small trees and bucking firewood. The .325” pitch chain offers more torque than smaller 1/4” pitch chains.
• 3/8″ Pitch: A very popular and widely used pitch, common on mid-sized and large chainsaws used for more demanding tasks. The 3/8” pitch chain is used by homeowners and professional loggers alike.
• .404″ Pitch: The largest pitch, typically found on very large and powerful chainsaws used for professional logging and heavy-duty work. The .404” chains offer maximum torque but the cut can be slower than other pitches.
• .043″ Gauge: A smaller gauge used on light-duty chainsaws. It is important not to use this size on a larger gauge bar.
• .050″ Gauge: A very common gauge, used on mid-sized and large chainsaws.
• .058″ Gauge: Another gauge often found on mid-sized and large chainsaws.
• .063″ Gauge: A wider gauge, often used on powerful and professional chainsaws.

Tips for Ordering the Correct Replacement Chain

Now that you know how to measure, here are some tips for ordering the correct replacement chain:

• Double-Check All Measurements: Ensure you’ve double-checked the pitch, gauge, and drive link count.
• Use Manufacturer Part Numbers: If available, use the manufacturer’s part number to ensure a precise match.
• Consider Brand Compatibility: While some chains are universal, others are designed to work best with specific saw models.
• Read Customer Reviews: Check customer reviews for the chains before ordering to ensure they perform well on your type of saw.
• Check Return Policies: When ordering online, make sure that there is a returns policy if the chain doesn’t fit the saw.

Safety First: Chain Installation and Maintenance

Once you’ve received your new chain, always follow these safety precautions when installing and using it:

• Wear Protective Gear: Wear gloves and safety glasses.
• Refer to the Manual: Always follow the manufacturer’s instructions for installing the new chain.
• Adjust Chain Tension: Correctly tension the chain following the directions in the manual.
• Regularly Inspect the Chain: Regularly check for wear and damage and replace the chain before it becomes hazardous.
• Sharpen the Chain Regularly: Sharpen your chain to ensure optimal cutting performance and to reduce stress on the saw.

Conclusion

Accurately measuring your chainsaw chain is a critical skill for any chainsaw owner. Whether you are a homeowner doing yard work or a professional logger, knowing how to identify the correct replacement chain ensures the safety, efficiency, and longevity of your tool. By understanding the concepts of pitch, gauge, and drive link count and by following the detailed steps outlined in this guide, you can confidently measure your chain, order the right replacement, and keep your chainsaw working optimally.

Remember, proper chain measurement and maintenance are not just about convenience; they are vital components of chainsaw safety and performance. Take the time to measure your chain correctly and keep your equipment well-maintained so that you can perform all chainsaw tasks safely and efficiently. Happy cutting!