Determining the correct chain size for your chainsaw is crucial for optimal performance and safety. An improperly sized chain can lead to premature wear, reduced cutting efficiency, and potential hazards. Fortunately, measuring a chain for a chainsaw is a relatively straightforward process that can be accomplished with a few simple steps. In this guide, we will provide detailed instructions on how to accurately measure your chainsaw chain, ensuring that you have the right fit for your specific model.
The first step in measuring a chainsaw chain is to count the number of drive links. Drive links are the individual links that engage with the sprocket on the chainsaw’s powerhead. To count the drive links, place the chain on a flat surface and carefully separate the links. Start counting from one end of the chain and continue until you reach the other end. The total number of drive links you count will determine the correct replacement chain size for your chainsaw.
Once you have counted the number of drive links, you can use the following formula to calculate the chain’s pitch: Pitch = Number of Drive Links / 2. The pitch is a measurement that represents the distance between any three consecutive rivets on the chain. Chainsaws typically have a pitch of either 3/8″, .325″, or 1/4″. By determining the pitch, you can ensure that the replacement chain you purchase has the correct spacing to fit properly on your chainsaw’s sprocket. Additionally, you should also check the gauge of the chain, which refers to the thickness of the drive links. The gauge is typically measured in inches and should match the gauge of the original chain to ensure proper fit.
Identifying the Proper Chain Length
Determining the correct chain length for your chainsaw is crucial for ensuring optimal performance and safety. Several factors influence the chain’s length, including the chainsaw’s bar length, the number of drive links, and the pitch. To accurately measure the chain, follow these steps:
1. **Measure the Bar Length:** Use a measuring tape or ruler to determine the length of the chainsaw bar from the tip of the nose to the end of the groove where the chain fits. Record this measurement in inches or centimeters.
2. **Count the Drive Links:** Remove the chain from the chainsaw and lay it out on a flat surface. The drive links are the protruding, tooth-shaped links that engage with the sprocket on the bar’s nose. Count the number of drive links on the chain.
3. **Calculate the Chain Length:** Use the following formula to determine the proper chain length:
| Bar Length (inches) |
Drive Link Count |
| 12 |
50-52 |
| 14 |
54-56 |
| 16 |
58-60 |
| 18 |
62-64 |
| 20 |
66-68 |
| 22 |
68-70 |
| 24 |
70-72 |
| 26 |
72-74 |
Locating the Guide Bar’s Drive Link Count
To accurately measure the chain for your chainsaw, you need to determine the number of drive links on your guide bar. Follow these steps:
- Inspect the guide bar: Look for a series of numbers stamped or etched onto the narrow side of the guide bar, near the nose.
| Example Guide Bar Markings |
| 16″ 325-72 |
In this example, “325” represents the pitch, “72” is the number of drive links, and “16” is the length of the bar.
- Visual count: If the guide bar does not have markings, you can count the number of drive links manually. Hold the bar horizontally with the teeth facing up and count the number of connecting links between the two rivet heads. Drive links typically have an oblong hole for securing the chain to the bar.
- Use a worksheet: Some chainsaw manufacturers provide a worksheet or chart that indicates the number of drive links based on the model number or length of the guide bar. Refer to your chainsaw’s user manual or consult the manufacturer’s website for this information.
Determining the Pitch and Gauge
Before measuring the length of a chainsaw chain, you need to determine its pitch and gauge. These measurements are required to ensure you purchase the correct replacement chain.
Pitch
The pitch of a chainsaw chain refers to the distance between adjacent drive links. It is measured in inches, and common pitches include 0.325", 0.375", and 0.404".
To measure the pitch, count the number of drive links within a 6" segment of the chain. Divide the number of drive links by 2 to get the pitch in inches.
For example, if you count 16 drive links within a 6" segment, the pitch would be 16 รท 2 = 0.325".
Gauge
The gauge of a chainsaw chain refers to the thickness of the drive links. It is typically measured in millimeters, with common gauges being 0.043", 0.050", and 0.058".
To measure the gauge, use a caliper or a gauge tool to measure the width of a drive link at its thickest point.
| Gauge (mm) |
Approximate Inch Measurement |
| 0.043 |
0.017" |
| 0.050 |
0.020" |
| 0.058 |
0.023" |
Measuring the Length Using a Tape Measure
Finding the Exact Chain Length
To determine the precise chain length required for your chainsaw, you must:
-
Remove the Chain: Detach the chain from the chainsaw by following the manufacturer’s instructions.
-
Straighten the Chain: Uncoil and straighten the chain on a flat surface to ensure accuracy.
-
Measure Total Drive Links: Using a tape measure, count and measure the length of all the drive links, which are the longer rectangular links. Record this measurement (A).
-
Calculate Chain Length: To determine the chain length, follow these steps:
- Determine the pitch value of your chainsaw (e.g., 0.325 inches).
- Multiply the pitch value by the number of drive links counted in step 3 (e.g., 0.325 inches x 70 links = 22.75 inches).
- Add 1-2 inches for the connecting link(s) (e.g., 22.75 inches + 1.5 inches = 24.25 inches).
-
Round to Nearest Inch: The calculated length may not be an exact inch measurement. Round it up or down to the nearest whole inch for accuracy.
| Pitch Value |
Example Calculation |
Example Length |
| 0.325 inches |
0.325 inches x 70 links + 1.5 inches |
24.25 inches |
| 0.375 inches |
0.375 inches x 68 links + 1.5 inches |
26.25 inches |
Adding Extra Length for Overlap
To ensure a secure and reliable fit, it is essential to add extra length to the chain for overlap. This overlap allows the chain to properly engage with the bar and drive sprocket, reducing the risk of jumping or derailment.
The amount of overlap required varies depending on the type of chain and bar combination. However, as a general rule of thumb, it is recommended to add approximately 1 to 1.5 inches (2.5 to 3.8 cm) of extra length to the chain.
To calculate the total length of chain needed, including the overlap, follow these steps:
- Measure the length of the bar from the tip to the base.
- Add 1 to 1.5 inches (2.5 to 3.8 cm) to the bar length.
- Divide the total length by the pitch of the chain to determine the number of drive links required.
Remember that it is always better to err on the side of caution by adding slightly more overlap than necessary. Excess overlap can easily be adjusted and removed after installation.
| Bar Length |
Recommended Overlap |
Total Chain Length |
| 16 inches |
1.25 inches |
17.25 inches |
| 18 inches |
1.5 inches |
19.5 inches |
| 20 inches |
1.75 inches |
21.75 inches |
Calculating the Specific Link Count
To determine the precise link count for your chainsaw chain, follow these steps:
1. Gather Materials: You will need a ruler or measuring tape, a hook tool, and safety gloves.
2. Prepare the Chain: Remove the chain from the chainsaw and ensure it is clean and free of debris.
3. Find the Starting Link: Locate the link that has a “drive link” and an “idler link” connected. The drive link will have two teeth, while the idler link has one.
4. Mark the Starting Point: Use a felt-tip marker or other visible indicator to mark the starting link.
5. Measure the Pitch: Measure the distance between the centers of three consecutive rivets. Divide this value by 2 to obtain the pitch of the chain (in inches).
6. Count the Links: Starting from the marked starting link, count every third rivet. Each set of three rivets represents one link (inclusive of the starting link).
7. Multiply by the Pitch: Multiply the link count by the pitch to calculate the overall length of the chain in inches:
| Length (in) |
= (Link Count) x (Pitch) |
Considering the Nose Sprocket
The nose sprocket is a small, gear-like component located at the tip of the chainsaw’s bar. Its primary function is to guide the chain around the tip of the bar and ensure that it remains in place during operation. The nose sprocket is typically made of hardened steel for durability, and its size and shape vary depending on the chainsaw model and intended use.
When measuring a chain for a chainsaw, it’s crucial to consider the nose sprocket. The correct chain length ensures proper fit and performance, preventing damage to the sprocket or the chain itself.
The nose sprocket has a specific number of teeth, which corresponds to the number of drive links in the chain. Drive links are the links that engage with the sprocket and pull the chain around the bar. The number of drive links in a chain is typically indicated in the chain’s description or on the packaging. To determine the appropriate chain length, you need to match the number of drive links in the chain to the number of teeth on the nose sprocket.
For example, if the nose sprocket has 7 teeth, you would need a chain with 7 drive links. To ensure accuracy, it’s recommended to consult your chainsaw’s operator’s manual or refer to the manufacturer’s specifications for the specific chain length required for your particular chainsaw model and nose sprocket configuration.
Chain Length and Number of Teeth
| Teeth on Nose Sprocket |
Chain Length (Drive Links) |
| 6 |
6 |
| 7 |
7 |
| 8 |
8 |
| 9 |
9 |
| 10 |
10 |
Determining the Correct Length
To ensure optimal performance, it’s crucial to measure the chainsaw chain accurately. Place the new chain on the guide bar, aligning the first cutter with the drive sprocket. Pull the remainder of the chain over the bar and guide it around the nose sprocket. If the chain fits snugly without any excess slack, it’s likely the correct length.
Troubleshooting Short or Long Chains
Encountering a chain that is either too short or too long can lead to operational issues. Here’s how to address these problems:
Chain Too Short
Symptoms:
- Chain won’t wrap around the nose sprocket fully
- Chain may bind or jump off the bar
Solution:
- Add a new link to the chain
- Replace the entire chain with a longer one
Chain Too Long
Symptoms:
- Chain hangs loose and sags
- Chain may bind or jump off the bar
- Increased risk of kickback
Solution:
- Remove a link from the chain
- Replace the entire chain with a shorter one
Determining the Ideal Chain Length for Various Guide Bar Sizes
The following table provides a general guideline for selecting the appropriate chain length for different guide bar sizes:
| Guide Bar Size (inches) |
Chain Length (drive links) |
| 12-14 |
50-52 |
| 16-18 |
56-58 |
| 20-22 |
62-64 |
| 24-26 |
68-70 |
It’s important to note that these values are approximate and may vary slightly depending on the specific chainsaw model and bar.
Measuring with a Measuring Stick
1. Determine the length of the bar.
Measure the length of the chainsaw bar from the tip of the nose to the end of the tail.
2. Add 2 to 4 inches to the bar length.
This will give you the approximate length of chain you need.
3. Wrap the measuring stick around the chain.
Start at the end of the chain and wrap the measuring stick around the chain, overlapping the end by about 1 inch.
4. Mark the measuring stick.
Use a pencil or marker to mark the measuring stick at the point where the end of the chain overlaps.
5. Measure the length of the marked section.
Use a ruler or tape measure to measure the length of the marked section on the measuring stick.
6. Add 2 to 4 inches to the measured length.
This will give you the approximate length of chain you need.
7. Cut the chain to the desired length.
Use a chain saw chain cutter to cut the chain to the desired length.
8. File the chain to sharpen it.
Use a chain saw file to sharpen the chain.
9. Install the chain on the chainsaw.
Follow the manufacturer’s instructions for installing the chain on the chainsaw.
10. Adjust the chain tension.
Follow the manufacturer’s instructions for adjusting the chain tension. The chain should be tight enough to prevent it from slipping off the bar, but not so tight that it binds.
| Chain Length |
Bar Length |
| 20 inches |
18 inches |
| 24 inches |
22 inches |
| 28 inches |
26 inches |
How To Measure A Chain For A Chainsaw
In order to ensure that your chainsaw is running at its best, it is important to have the correct chain size. The chain size is determined by the pitch, gauge, and length. The pitch is the distance between the drive links, the gauge is the thickness of the drive links, and the length is the number of drive links in the chain.
To measure the chain, you will need a measuring tape or a chain gauge. If you are using a measuring tape, place the tape at the beginning of the chain and measure to the end of the chain. The measurement should be in inches. If you are using a chain gauge, simply insert the gauge into the chain and read the measurement.
Once you have the measurement, you can compare it to the recommended chain size for your chainsaw. The recommended chain size can be found in the owner’s manual or on the manufacturer’s website.
If the chain size is not correct, it can cause the chainsaw to run poorly or even damage the chainsaw. Therefore, it is important to make sure that you have the correct chain size before you start using your chainsaw.
People Also Ask
How do I know what size chain I need for my chainsaw?
The recommended chain size for your chainsaw can be found in the owner’s manual or on the manufacturer’s website.
What is the difference between pitch, gauge, and length?
The pitch is the distance between the drive links, the gauge is the thickness of the drive links, and the length is the number of drive links in the chain.
Can I use a chain that is too long or too short for my chainsaw?
No, using a chain that is too long or too short for your chainsaw can cause the chainsaw to run poorly or even damage the chainsaw.
