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How To Measure The Length Of A Chainsaw Bar: Simple Guide
What is the standard way to measure a chainsaw bar? The standard way to measure a chainsaw bar is to count the drive links on the chain and then refer to a chainsaw bar length guide or manufacturer’s specifications.
Knowing your chainsaw bar’s length is vital for several reasons. It dictates the type of work your saw can handle, the size of the wood you can cut, and crucially, the correct chain and sprocket you need for optimal performance and safety. If you’ve ever wondered, “How do I measure the length of a chainsaw bar?” or “What is my chainsaw bar size measurement?”, this guide will walk you through it. We’ll explore different methods for chainsaw bar identification, determine chainsaw bar size, and even how to use a chainsaw bar length calculator.
Why Measuring Your Chainsaw Bar Matters
Your chainsaw bar is the component that guides the cutting chain. Its length directly impacts your saw’s capabilities:
- Cutting Capacity: A longer bar allows you to cut through thicker logs and larger trees.
- Maneuverability: Shorter bars are generally lighter and more agile, making them suitable for limbing, pruning, and tight spaces.
- Power Requirements: Longer bars demand more power from the engine. Using a bar that’s too long for your saw can lead to overheating, reduced cutting speed, and premature wear.
- Chain and Sprocket Compatibility: The correct bar length is essential for matching the right chainsaw chain and sprocket. Using mismatched parts can cause chain derailment, damage to the bar and engine, and pose a significant safety hazard.
This guide will help you with chainsaw bar length check and provide a clear chainsaw bar length standard to follow.
Common Methods for Measuring Chainsaw Bar Length
There are a few reliable ways to figure out your chainsaw bar’s length. Each method is straightforward and will give you the information you need to buy the correct replacement parts.
Method 1: Counting Drive Links (The Most Accurate Method)
This is the most precise way to measure chainsaw blade length because it’s a direct count of the components that interact with the sprocket and engine.
What are drive links? Drive links are the small metal tabs on the bottom of each chain link that sit inside the groove of the chainsaw bar and are driven by the engine’s sprocket.
Steps to Count Drive Links:
- Safety First: Ensure your chainsaw is off, the chain brake is engaged, and you are wearing sturdy gloves. A dull or damaged chain can still cause injury.
- Lay the Chain Flat: Carefully unhook the chain from around the bar and lay it out on a clean, flat surface. You might need to unhook it at the joining link.
- Identify the Drive Links: Look at the bottom edge of the chain. You’ll see distinct metal pieces that protrude downwards. These are the drive links.
- Start Counting: Pick one drive link and begin counting each one as you move along the chain until you reach the end of the chain. Be methodical to avoid missing any or counting one twice.
- Record the Number: Write down the total number of drive links you counted. Common chain counts are 52, 56, 64, 72, 84, and so on.
- Cross-Reference: Once you have your drive link count, you can consult a chainsaw bar length guide or your saw’s manual to determine the corresponding bar length. Manufacturers typically have charts that link drive link count to bar length (e.g., 72 drive links often corresponds to a 20-inch bar).
Example: If you count 72 drive links on your chain, you likely have a 20-inch bar.
Method 2: Measuring the Cutting Length (Less Precise, but Quick)
This method involves measuring the actual cutting portion of the bar. While not as exact as counting drive links, it can give you a good approximation.
Steps to Measure Cutting Length:
- Safety First: Again, ensure the saw is off, the brake is engaged, and wear gloves.
- Identify the Cutting Length: The cutting length is the distance from the tip of the bar to where the chain leaves the bar and engages with the powerhead. You are measuring the part of the bar that actively cuts wood.
- Use a Measuring Tape: Place a measuring tape or ruler alongside the bar.
- Measure from Tip to Near the Powerhead: Measure the length from the very tip of the bar down to the point where the chain groove stops or where the bar begins to curve towards the powerhead. Do not include the mounting area that attaches to the chainsaw body.
- Record the Measurement: Note the measurement in inches or centimeters.
Important Consideration: This measurement is often rounded to the nearest inch or two for standard bar sizing. For instance, a bar that measures 18.5 inches might be sold as a 19-inch or 20-inch bar, depending on the manufacturer’s chainsaw bar dimensions. This is why counting drive links is preferred for precise purchasing.
Method 3: Checking the Chainsaw Bar Stamping
Many chainsaw bars have markings stamped directly onto them that indicate their specifications. This is a great shortcut for chainsaw bar identification.
Steps to Check Bar Stamping:
- Locate the Stamping: Look on the bar itself, usually near the base where it attaches to the chainsaw. You might need to clean away dirt and debris to see it clearly.
- Identify the Numbers: You will typically find two numbers stamped on the bar:
- The first number: This usually represents the gauge of the chain (the thickness of the drive link). Common gauges are .050″ (1.3mm) and .058″ (1.5mm).
- The second number: This represents the pitch of the chain (the distance between the drive links, measured from rivet to rivet, divided by two). Common pitches are .325″, 3/8″, and .404″.
- Often, the bar length is also stamped here, or it can be deduced from these numbers in conjunction with a guide. For example, a common stamping might be “200”—this could indicate a 20-inch bar, though it’s not always so straightforward.
- Consult a Guide: If the length isn’t explicitly stamped, you’ll need to cross-reference the gauge and pitch with a chainsaw bar length guide or your chainsaw’s manual.
Method 4: Checking Your Chainsaw’s Manual or Manufacturer’s Website
The most reliable source for your chainsaw’s specifications is the owner’s manual. This document is designed to provide all necessary details, including the correct chainsaw bar size measurement.
Steps to Use Your Manual:
- Locate Your Manual: Find the manual that came with your chainsaw.
- Find the Specifications Section: Look for sections detailing “Specifications,” “Bar and Chain,” or similar headings.
- Identify Bar Length: The manual will clearly state the recommended or standard bar length for your particular chainsaw model.
If you don’t have the manual, you can usually find it online by searching for your chainsaw’s make and model number on the manufacturer’s website. This is also a good place to look for a chainsaw bar length calculator if they offer one.
Understanding Chainsaw Bar Length Standards
Chainsaw bars are manufactured in standard lengths, typically measured in inches. While there can be slight variations, these standards ensure interchangeability and availability of parts. Common bar lengths include:
- 10 inches
- 12 inches
- 14 inches
- 16 inches
- 18 inches
- 20 inches
- 24 inches
- 28 inches
- 32 inches
- 36 inches
The chainsaw bar length standard also relates to the pitch and gauge of the chain. For example, a 16-inch bar might commonly use a .325″ pitch chain with a .050″ gauge, while a longer 24-inch bar might use a 3/8″ pitch chain with a .063″ gauge. Knowing these chainsaw bar dimensions is crucial.
Chain Pitch and Gauge Explained
To correctly determine chainsaw bar size, you also need to know about chain pitch and gauge.
- Chain Pitch: This is the distance between the drive links. It’s measured from the tip of one rivet to the tip of the next rivet, then divided by two. Common pitches are .325″, 3/8″, and .404″. The pitch of the chain must match the pitch of the sprocket and the bar.
- Chain Gauge: This is the thickness of the drive link that sits in the bar groove. Common gauges are .050″ (1.3mm), .058″ (1.5mm), and .063″ (1.6mm). The gauge must precisely match the groove width of the bar to ensure proper fit and lubrication.
When you are looking to replace a bar or chain, you will need to know your drive link count, the desired bar length, the chain pitch, and the chain gauge.
Using a Chainsaw Bar Length Calculator
Some online resources and manufacturer websites offer a chainsaw bar length calculator. These tools can be helpful if you know your drive link count and want to quickly find the corresponding bar length.
How they typically work:
- You input your drive link count.
- The calculator uses a database of standard chain counts and bar lengths.
- It provides the most common bar length associated with that drive link count.
Remember that these calculators are usually based on general chainsaw bar length standards. Always double-check with your chainsaw’s manual or manufacturer specifications for the most accurate information for your specific model.
Common Pitfalls to Avoid
- Using the Wrong Length Bar: As mentioned, a bar that is too long can strain your engine, reduce cutting efficiency, and increase wear. A bar that is too short might not have the cutting capacity you need.
- Ignoring Chain Compatibility: A bar and chain must have the same pitch and gauge. Mismatched parts lead to poor performance and damage.
- Not Counting Drive Links Accurately: This is the most common mistake. Take your time and recount if you’re unsure.
- Assuming Bar Size is Just the Marked Length: The “size” of a bar often refers to its cutting length, but for replacement purposes, the drive link count and matching pitch/gauge are paramount.
Table: Drive Links to Common Bar Lengths
This table provides a general guideline. Always verify with your specific saw’s specifications.
| Drive Links | Typical Bar Length (Inches) |
|---|---|
| 44 | 12 |
| 52 | 14 |
| 56 | 16 |
| 64 | 18 |
| 72 | 20 |
| 84 | 24 |
| 90 | 28 |
| 100 | 32 |
| 110 | 36 |
Table: Common Chainsaw Bar Dimensions (Pitch & Gauge)
This table shows common combinations. Note that higher horsepower saws or professional-grade equipment might use different combinations.
| Bar Length (Inches) | Common Pitch | Common Gauge (inches) | Common Gauge (mm) |
|---|---|---|---|
| 10-16 | .325″ | .050″ | 1.3 |
| 10-16 | 3/8″ | .050″ | 1.3 |
| 16-24 | 3/8″ | .058″ | 1.5 |
| 18-24 | 3/8″ | .050″ | 1.3 |
| 20-36 | 3/8″ | .058″ | 1.5 |
| 20-36 | .404″ | .063″ | 1.6 |
| 28+ | .404″ | .063″ | 1.6 |
Conclusion
Accurately measuring your chainsaw bar length is a fundamental skill for any chainsaw owner. By counting your drive links, checking the bar stamping, or referring to your manual, you can ensure you are using the correct parts. This not only maximizes your chainsaw’s performance and lifespan but, most importantly, guarantees your safety while operating this powerful tool. Whether you’re an experienced logger or a homeowner tackling yard work, getting your chainsaw bar size measurement right is the first step to a successful and safe cut.
Frequently Asked Questions (FAQ)
Q1: Can I put a longer bar on my chainsaw than what’s recommended?
While technically possible in some cases, it’s generally not advised. Using a bar that’s too long can strain your chainsaw’s engine, leading to overheating, reduced cutting speed, and premature wear on engine components and the drive sprocket. Always adhere to the manufacturer’s recommended bar length for your specific model.
Q2: How do I know if my chain gauge is correct for my bar?
The chain gauge is the thickness of the drive link. It must precisely match the groove width of your chainsaw bar. If the gauge is too thin, the chain can wobble and derail. If it’s too thick, the chain won’t fit into the groove, and the saw won’t run correctly, potentially causing damage. Check the stamping on your bar or consult your manual for the correct gauge (e.g., .050″ or 1.3mm).
Q3: What does “.325” or “3/8″” mean when talking about chainsaw chains?
These measurements refer to the chain pitch, which is the distance between the drive links. It’s calculated by measuring from the tip of one rivet to the tip of the next, then dividing by two. This pitch must match the pitch of your chainsaw’s drive sprocket and the bar groove. For example, “.325” means the pitch is 325 thousandths of an inch, and “3/8″” means the pitch is three-eighths of an inch.
Q4: Is it better to measure my bar or count my drive links?
Counting your drive links is the most accurate method for determining the correct chain for your bar and thus the intended bar length. While measuring the cutting length of the bar is a quick approximation, variations in manufacturing can make it less precise for purchasing exact replacement parts. Drive link count is the definitive specification.
Q5: What if my chainsaw bar isn’t stamped with any numbers?
If your bar has no markings, your best bet is to consult your chainsaw’s owner’s manual. If you don’t have the manual, search for your chainsaw’s make and model number online to find the specifications on the manufacturer’s website. Alternatively, remove the chain and count the drive links, then use a reliable chainsaw bar length guide to find the corresponding bar size.