## 35 Chain vs 420: Which One Should You Choose for Your Chainsaw?

When it comes to chainsaw maintenance, few decisions impact performance as much as selecting the right chain. The debate between **35 chain vs 420** is one that confuses both DIY enthusiasts and professional loggers alike. While these two sizes look similar at first glance, they possess distinct **pitch, gauge, and drive link** specifications that make them non-interchangeable. Choosing the wrong one can lead to poor cutting efficiency, increased wear, and even safety hazards. This guide breaks down the differences in thickness, speed, and compatibility to help you make an informed purchase decision.

### Understanding Chain Measurements: Pitch and Gauge Explained

Before diving into the specifics of **35 chain vs 420**, it’s crucial to understand what the numbers actually mean. The first number refers to the **chain pitch**, which is the distance between any three consecutive rivets divided by two. The second number (often omitted) refers to the **drive link gauge**—the thickness of the drive tangs that slide in the guide bar groove. For the **3/8″ pitch chain** (often called 35), the drive links are typically 1.3mm thick. On the other hand, the **420 chain** also features a 3/8″ pitch but uses a thicker 1.5mm drive link. This seemingly minor difference of 0.2mm is why **35 chain vs 420** bars are not cross-compatible—it’s a matter of fitment safety rather than preference.

### **35 Chain: The Lightweight Champion for Home Use**

The **35 chain** is engineered primarily for **light-duty chainsaws** and electric pruners. Its slim profile reduces overall weight and friction, which translates to less vibration and easier maneuverability for overhead cutting. Because it has a narrower drive link, it requires a guide bar with a **narrow gauge slot**. Most **35-chain equipped saws** range from 8″ to 16″ bar lengths, making them perfect for small firewood, branch trimming, or carpentry tasks. However, the thinner side profiles means this chain wears out faster when subjected to dusty or dirty wood. If you are a homeowner who uses a saw occasionally for **limbing and small felling**, the 35 chain offers an accessible balance of cutting speed and affordability.

### **420 Chain: The Rugged Workhorse for Demanding Tasks**

In contrast, the **420 chain** uses a **1.5mm drive link gauge**, which fits bars specifically rated for that dimension—commonly 14″ to 20″. This thicker gauge provides more surface contact with the bar groove, which enhances stability at high RPM and reduces the risk of derailing during aggressive plunge cuts. The heavier construction also holds up better under continuous professional use, making it a staple in **tree service workflows** and **firewood production**. The trade-off for extra durability is a slightly heavier chain that demands a more powerful motor to reach optimal chain speed. For anyone regularly cutting hardwoods over 12 inches in diameter, the 420 chain is the recommended choice for longevity and safety.

### **Speed and Cutting Efficiency: Is Thicker Always Slower?**

A common misconception is that the 420 chain will cut faster because it feels sturdier. In actuality, **chain speed** is heavily influenced by the bar’s overall weight and the ability of the drive sprocket to spin freely. The **35 chain** moves with less resistance through the guide rail, allowing a smaller saw motor to achieve high blade speeds—ideal for long ripping cuts in green softwood. Conversely, the **420 chain** has slightly more drag due to the thicker tangs, but it maintains a steadier feed under pressure. If you use a saw with a **high-torque engine** and a 3/8″ sprocket rated for