How to Measure Chainsaw Drive Length.

How to Measure Chainsaw Drive Length: A Guide on Proper Measurement.

Introduction

Choosing a chainsaw with an incorrect drive length may have severe consequences and affect the overall performance of the chainsaw. Poor selection may also cause dangerous kickback. Drive length signifies the number of drive links – the small, tooth-like tabs that fit into the guide bar – on the saw’s chain. If there is no proper fit of the chain to the number given, it will not be cut efficiently and possibly come off while being used. To ensure your chainsaw operates smoothly, it’s essential to measure chainsaw drive length accurately. This guide will take you through all the necessary steps needed for proper selection of chainsaw and its drive length.

Importance of choosing the drive length

🔧 Safety: Undoubtedly, if the drive length is not well calibrated to a specific range. Lower or higher values can lead to the derailing of the blade or a break.

⚙️ Performance: The correct drive length ensures that there is even distribution of tension, aiding in the avoidance of damage to your bar.

🛠️ Compatibility: Chains are made in the form of an increment catalog. Most sellers will showcase an inventory labeled by “drive links.” So in this case, measuring with a drive, “72DL” will be the preferred default as the 72 drives are used.

Finding your chainsaw drive length settings tips and tricks

Measure chainsaw drive length accurately is key to ensuring your chain fits and functions correctly. Count the number of drive links or check your saw’s manual to match the exact specs. For best results, always double-check before ordering a replacement chain. Also, explore our seasonal chainsaw guide to keep your chainsaw performing year-round

Method 1:

Counting the drive links can be the most accurate selection based on the user’s requirements.
Remove the chain from the saw, or put the chain flat on the table or any horizontal platform.
The drive links contain elements that bear a strong resemblance to the shark fins, so adopt a counting mechanism at this point.
To avoid double-counting the starting point, mark it with a bright marker or chalk.
Cross-check your manual: Most twenty-inch bars have a metric of 72 drive links, but this can change.

Note : Most 20-inch bars typically use chains with 72 drive links, but always verify with your specific model.

Method 2:

This method narrows down the descriptions as seen: check the old packaging’s to see if the chain has stamps like “72DL” close to the rivets.
They frequently define a boundless bar length, pitch, gauge, and drive links encapsulated by a single code that replaces all others.

Method 3:

Measure Pitch & Gauge (For Replacements).

Pitch = Distance between any 3 rivets ÷ 2 (commonly 3/8″, 0.325″, or 0.404″).
Gauge = Thickness of the drive link tab (use calipers; usually 0.050″, 0.058″, or 0.063″).

TIPS:

Use a twist tie or zip tie to conglomerate the chain in loops. This methodology aids in the easier counting of the links. The pitch and gauge are often stamped on the chainsaw bar or listed in the owner’s manual.

Avoid Mistakes

To finish off with thoughts, avoid the common mistake that slips through, telling the difference between drive length, gauge, and bar length. These straight lines cut through the paths diverging the idea, for example, an 18” bar does not give you the freedom of a chain assuming to have 72 drive links and that’s where errors start.
❌ Assuming fit regarding chainsaw – Many models can fit different bars, but never forget to check the chain or manual first.
❌ Safer than sorry approach – Chains that have been used for a long period tend to become looser. If your count is off and the chain looks worn, replace any discrepancies.

Visual Comparison

Bonus Table

Bar Length	Drive Links	Common Pitch
16″	66″	3/8″
18″	68-72	72-76
20″	72-76	3/8″

Conclusion

After all this time, you found the ideal drive length for you. Look for your pitch and gauge once again, but cross-check them this time. Make sure the new chain you get mirrors the specs on your bar. Make sure to read our guide on how to tension your chainsaw chain, it might come in handy

Analogy :
Considering the links in the drive as the teeth on a bicycle chain would enable you to have more clarity over the entire process an ideal setup would mean they all ride smoothly together with the gear. If any single gear-tooth sequence is off, the ride becomes unpleasant.

Still recommend using your manual or bar stamp to double-check! For more detailed information, consult your chainsaw’s manual or visit reputable sources like Husqvarna’s Chainsaw Chain Guide and Plano Power’s Replacement Saw Chain Guide.

✅ Stay Safe Cut Smart

📌FAQs

"Can I use a chain with more drive links?"

No—it must match exactly. Even one extra link prevents proper tensioning.

"Where can I buy chains by drive length?"

Most retailers list DL count (e.g., Amazon, hardware stores)..