What is the correct way to measure a chainsaw bar? The most common and accurate method for measuring your chainsaw bar length is by measuring the actual cutting length of the blade, from the tip to the drive sprocket housing. This measured length, when rounded to the nearest inch, typically corresponds to the advertised chainsaw bar size.
Knowing your chainsaw bar size is crucial for many reasons. Whether you’re looking to replace a worn-out bar, purchase a new one for a different cutting application, or even consider upgrading your current setup, having the precise measuring chainsaw bar details is paramount. This chainsaw bar length guide will walk you through everything you need to know to accurately determine chainsaw bar size and ensure you get the right part for your saw. We’ll cover the methods, the reasons why it matters, and how to interpret common chainsaw bar measurement notations.
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Why Knowing Your Chainsaw Bar Length Matters
Your chainsaw bar, also known as the chainsaw guide bar size, is the metal component that the chain travels around. Its length directly impacts the cutting capacity and overall performance of your chainsaw.
- Replacement Parts: The most common reason for needing to know your bar length is for replacement. Chainsaw bars wear down over time, and eventually, they need to be replaced to maintain safe and efficient operation. Using the incorrect chainsaw bar size can lead to poor performance, increased wear on the chain and bar, and even damage to your chainsaw’s engine or clutch.
- Cutting Applications: Different cutting tasks require different bar lengths. For instance, a shorter bar is generally better for limbing and making precise cuts in smaller branches, while a longer bar is needed for felling larger trees or bucking thick logs. Matching your bar length to your typical workload ensures optimal efficiency and safety.
- Performance and Balance: The length of the bar influences the overall balance and handling of the chainsaw. A longer bar can make the saw feel heavier and less maneuverable, especially for less experienced users. Conversely, a shorter bar might not provide enough reach or cutting power for larger jobs.
- Chain Compatibility: The length of the bar is directly related to the number of drive links in the chain. If you buy a new chain without knowing the bar length and pitch/gauge, it simply won’t fit or function correctly.
How to Measure Your Chainsaw Bar: The Definitive Method
Accurately measuring your chainsaw bar is straightforward once you know where to look and what to measure. We’ll break down the process step-by-step.
Step 1: Safety First!
Before you begin any maintenance or measurement on your chainsaw, always prioritize safety.
- Ensure the saw is off: Make sure the chainsaw is completely turned off, the ignition is off, and the spark plug wire is disconnected. This prevents accidental starting.
- Let it cool: If the saw has been running, allow the engine and the bar to cool down to prevent burns.
- Wear protective gear: Even for a simple measurement, it’s good practice to wear gloves to protect your hands from sharp edges and potential chain snagging.
Step 2: Locate the Bar
The chainsaw bar is the long, flat metal piece that the chain rides on. It extends from the body of the chainsaw.
Step 3: The Measurement Point
This is the most crucial part of measuring chainsaw bar accurately. You need to measure the actual cutting length of the bar.
- Start: Begin your measurement at the very tip of the bar. This is the point furthest from the chainsaw body.
- End: Measure along the cutting edge of the bar, following its curve, until you reach the point where the chain meets the nose sprocket or the area where the drive links engage with the drive sprocket within the housing. Do NOT measure to the very end of the bar itself, as the tip is often not part of the usable cutting surface. A common mistake is to measure the entire physical length of the bar, which is not the correct chainsaw cutting bar length.
Step 4: Use a Measuring Tape or Ruler
Use a reliable measuring tape or a metal ruler for this task.
- Align: Place the zero mark of your tape measure at the starting point (the tip).
- Extend: Carefully extend the tape measure along the cutting edge of the bar to the ending point as described above.
- Read: Note the measurement.
Step 5: Round to the Nearest Inch
Chainsaw bars are typically advertised by their cutting length, rounded to the nearest inch. For example, if your measurement is 17.5 inches, it’s likely a 18-inch bar. If it’s 15.2 inches, it’s likely a 16-inch bar. This rounded number is your chainsaw bar size.
Alternative Methods and What to Look For
While direct measurement is the most reliable, there are other ways to identify your chainsaw guide bar size, especially if direct measurement is difficult or you need to confirm the information.
Checking Manufacturer Markings
Many chainsaw bars have the length stamped directly onto them.
- Location: Look on the flat surface of the bar, often near the base where it attaches to the chainsaw body.
- What to Look For: You might see numbers like “16”, “18”, “20”, etc. This number usually indicates the advertised chainsaw bar length specifications. Sometimes, the pitch and gauge might also be stamped here.
Consulting Your Chainsaw Manual
Your chainsaw’s owner’s manual is an invaluable resource.
- Find the Specifications: Look for the section detailing parts or specifications. It will almost always list the correct chainsaw bar length and other important chain details like pitch and gauge.
- Model Number: Make sure you have your chainsaw’s exact model number handy when looking up information in the manual or online.
Online Resources and Chainsaw Bar Length Charts
If you can’t measure directly or find markings, the internet is your friend.
- Model Number Search: Search online for your chainsaw’s make and model number along with terms like “bar length” or “specifications.”
- Chainsaw Bar Length Chart: Many manufacturers and aftermarket parts suppliers provide chainsaw bar length chart resources that list compatible bar sizes for various chainsaw models. This can be a quick way to confirm or find your chainsaw bar size.
Understanding Chainsaw Bar Terminology: Pitch, Gauge, and Drive Links
Beyond just the length, there are other critical measurements for your chainsaw bar and chain:
- Pitch: This refers to the distance between the drive links of the chain, measured from the center of one rivet to the center of the next rivet, then divided by two. Common pitches are 3/8″, .325″, and .404″. The pitch of the chain must match the pitch of the bar and the sprocket on your chainsaw.
- Gauge: This is the thickness of the drive links that fit into the groove of the bar. Common gauges are .050″ (or 1.3mm) and .063″ (or 1.6mm). The gauge of the chain must match the groove width of the bar.
- Drive Links: These are the links on the bottom of the chainsaw chain that engage with the drive sprocket and fit into the groove of the bar. The number of drive links is specific to the bar length and pitch. To get the correct chain, you need both the bar length and the number of drive links.
Example: A common setup might be a 16-inch bar with a 3/8″ pitch, .050″ gauge, and 56 drive links.
Common Chainsaw Bar Lengths and Their Uses
Here’s a general idea of how different chainsaw bar sizes are typically used:
| Bar Length (Cutting Length) | Typical Chainsaw Engine Size (cc) | Common Uses |
|---|---|---|
| 10″ – 12″ | 25cc – 35cc | Limbing, small branches, light pruning, hobby use |
| 14″ – 16″ | 35cc – 50cc | General property maintenance, felling small to medium trees, bucking firewood |
| 18″ – 20″ | 50cc – 70cc | Felling medium to large trees, processing substantial firewood, professional use |
| 20″ – 24″ | 60cc – 80cc+ | Felling large trees, heavy-duty professional logging, large-scale timber |
| 24″+ | 70cc+ | Specialized professional logging, extremely large trees, demanding applications |
Important Note: These are general guidelines. The actual capabilities of a chainsaw also depend heavily on the engine’s power, the build quality of the saw, and the user’s skill. Always check your chainsaw’s specific chainsaw bar length specifications and recommendations.
Common Mistakes to Avoid When Measuring
- Measuring the wrong part: As mentioned, don’t measure the entire physical length of the bar. Focus on the cutting surface.
- Not accounting for the tip: The very tip of the bar, especially if it has a nose sprocket, isn’t part of the cutting length.
- Inaccurate tools: Using a flexible tape measure or a worn ruler can lead to incorrect readings.
- Ignoring pitch and gauge: While the length is critical, forgetting to match the pitch and gauge of the chain to the bar and saw will result in incompatibility.
- Assuming all bars are the same: While many saws use common bar lengths, there are variations, and manufacturers might have specific mounting systems. Always verify for your particular saw.
Replacing Your Chainsaw Bar: What Else You Need to Know
When you need to replace your chainsaw bar, you’ll typically need to purchase a new chain as well.
- Bar Length: This is the measurement we’ve focused on.
- Pitch: Must match your saw and sprocket.
- Gauge: Must match your saw and bar groove.
- Mount Type: Chainsaws use different mounting systems for their bars. There are several common types (e.g., S-Type, D-Type, H-Type). Ensure the new bar’s mount matches your chainsaw’s powerhead. You can often find this information in your owner’s manual or by comparing your current bar’s mounting end to diagrams online.
If you’re unsure about any of these specifications, it’s best to consult your chainsaw’s manual or speak with a knowledgeable dealer or parts supplier. They can help you determine chainsaw bar size and other crucial details based on your chainsaw’s make and model.
Frequently Asked Questions (FAQ)
Q: Can I put a longer or shorter bar on my chainsaw?
A: While it’s sometimes possible to fit a different length bar, it’s generally not recommended unless explicitly supported by the manufacturer. Using a bar that is too long can overwork the engine, leading to overheating, reduced power, and premature wear. Using a bar that is too short might not be efficient for the tasks you intend to perform. Always check your chainsaw’s chainsaw bar length specifications and recommended bar sizes.
Q: How do I find the pitch and gauge of my chainsaw chain?
A: The pitch and gauge are usually stamped on the drive links of the chain itself, or on the side of your existing chainsaw bar. They will be in fractions of an inch (e.g., 3/8″, .325″, .050″, .063″). If you can’t find it, your chainsaw manual or a parts supplier can help you identify it based on your chainsaw model.
Q: What does it mean if my chainsaw bar is “chattering”?
A: Bar chatter is often an indicator that the chain is not properly tensioned, is dull, or that the bar itself is worn or damaged. It can also occur if the bar length is not appropriate for the saw’s power.
Q: My chainsaw has a 16-inch bar. Is that the cutting length or the total length?
A: When a chainsaw bar size is advertised as 16 inches, it almost always refers to the cutting length, which is measured from the tip to the drive sprocket housing. The total physical length of the bar will be a few inches longer.
Q: Where can I find a chainsaw bar length chart?
A: You can find chainsaw bar length chart resources on the websites of major chainsaw manufacturers (Stihl, Husqvarna, Echo, etc.), reputable outdoor power equipment retailers, and specialized chainsaw parts suppliers. Searching online with your chainsaw’s make and model plus “bar size chart” should yield results.
By following these guidelines, you can confidently measure your chainsaw bar and ensure you select the correct replacement parts or appropriate bar for your cutting needs. Proper measurement and part selection are key to the longevity and efficient operation of your chainsaw.