Difference in chainsaw chain size explained
Choosing the correct Husqvarna chainsaw chain is essential for safe operation, efficient cutting and long component life.
However, chain sizes can be confusing because several measurements determine whether a chain is compatible with your chainsaw.
This guide explains the three key chain measurements—pitch, gauge and drive links—and how to identify the correct chain for your chainsaw.
Quick answer
To find the correct chainsaw chain size, you need to match:
- Pitch—the distance between chain links
- Gauge— the thickness of the drive links
- Drive link count—the number of drive links on the chain
A chain may have the correct guide bar length but still be incompatible if any of these specifications do not match.
Why chain size matters
Using the wrong chain can lead to:
- Poor cutting performance
- Excessive wear
- Chain derailment
- Damage to the guide bar or sprocket
- Safety risks during operation
Always match the chain specifications recommended for your chainsaw model.
What is chain pitch?
Pitch refers to the distance between the chain links.
It determines how the chain engages with the drive sprocket and guide bar.
Common chain pitches include:
- 1/4"
- 1/4" mini
- .325"
- .325" mini
- 3/8"
- 3/8" mini
- .404"
The pitch of the chain must match both the drive sprocket and guide bar.
Example:
A chain with a 3/8" pitch cannot be used with a sprocket designed for a .325" chain.
What is chain gauge?
Gauge is the thickness of the chain’s drive links—the part of the chain that fits inside the guide bar groove.
Common gauges include:
- .043" (1.1 mm)
- .050" (1.3 mm)
- .058" (1.5 mm)
- .063" (1.6 mm)
The chain gauge must match the guide bar groove.
If the gauge is incorrect:
- A chain that is too thick will not fit the guide bar.
- A chain that is too thin may fit loosely and operate unsafely.
What are drive links?
Drive links are the parts of the chain that run inside the guide bar groove and engage with the drive sprocket.
The number of drive links determines the overall chain length.
Even if two chains have the same:
- Pitch
- Gauge
- Guide bar length
they may still require a different number of drive links.
Example:
Two chains designed for a 16 inch guide bar may have different drive link counts depending on the chainsaw model.
Is guide bar length enough to choose a chain?
No.
One of the most common mistakes is choosing a replacement chain based only on guide bar length.
To select the correct chain, you must match:
- Guide bar length
- Chain pitch
- Chain gauge
- Drive link count
All four specifications must be correct.
Where can I find my chain specifications?
You can usually find chain specifications:
- Stamped on the guide bar
- In the operator’s manual
- On the chain packaging
- Using the Husqvarna Bars & Chains Guide
What if my new chain does not fit?
If your replacement chain does not fit:
- Check the chain gauge
- Verify the pitch
- Confirm the drive link count
- Inspect the guide bar for wear or damage
Even a small difference in specifications can prevent proper installation.
New chain won’t fit the guide bar?
Read: Why won’t my new chainsaw chain fit the guide bar
Common mistakes when choosing a chainsaw chain
Avoid these common errors:
- Choosing a chain based only on guide bar length
- Ignoring drive link count
- Mixing chain pitches
- Using the wrong gauge
- Assuming all chains for the same guide bar length are interchangeable
How to identify the correct replacement chain
The easiest method is to use information stamped on the guide bar.
Look for:
- Guide bar length
- Chain pitch
- Chain gauge
- Drive link information
If the markings are worn or difficult to read, consult your operator’s manual or use the Husqvarna Bars & Chains Guide.