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To determine the correct chainsaw chain size, you must measure the usable bar length, identify the chain pitch, gauge, and count the drive links. These four parameters together define exactly what saw chain your chainsaw requires. Relying on bar length alone is not sufficient and often leads to incorrect chain selection.
How to measure a chainsaw bar correctly
When users ask “how do you measure a chainsaw blade”, they are usually referring to the guide bar length. Chainsaw bars are measured by their effective cutting length, not the total physical length.
- Turn off the chainsaw and remove the spark plug for safety.
- Locate the front tip of the bar.
- Measure straight back to where the bar enters the chainsaw body.
- Round the measurement to the nearest even inch.
For example, a measurement of 15.5 inches corresponds to a 16-inch chainsaw bar. This value helps narrow down compatible saw chain sizes but does not determine the chain by itself.
What actually determines chainsaw chain size
If you are wondering “what size chain do I need”, the answer depends on three technical specifications rather than bar length alone.
- Pitch – the distance between chain rivets, indicating spacing compatibility
- Gauge – the thickness of the drive link that fits into the bar groove
- Drive links – the total number of links required for the bar length
Professional manufacturers such as Zhejiang Hengjiu Saw Chain Co., Ltd. produce chains in precise pitch and gauge combinations to ensure stable cutting, reduced vibration, and extended service life.
How to measure chainsaw chain pitch and gauge
Measuring chain pitch
Chain pitch is measured by calculating the distance between three rivets and dividing by two. Common pitches include 1/4", .325", 3/8" LP, 3/8", and .404".
Measuring chain gauge
Gauge refers to the thickness of the drive link where it fits into the guide bar groove. Typical gauges are .043", .050", .058", and .063". Using an incorrect gauge can cause excessive wear or dangerous chain instability.
Chainsaw chain pitch chart and common specifications
| Pitch | Gauge | Typical Bar Length | Application |
|---|---|---|---|
| 1/4" | .043" | 8"–12" | Pruning & compact saws |
| .325" | .050" | 13"–18" | General cutting |
| 3/8" LP | .050" | 12"–16" | Low-kickback chains |
| .404" | .063" | 20"+ | Harvesters & heavy-duty work |
How to determine chainsaw chain length by drive links
The most reliable way to answer “how long is a chain” is by counting the drive links. Even chains with the same pitch and gauge can differ in length.
- Check the bar stamp for drive link count
- Refer to the chainsaw manual
- Manually count the drive links on your existing chain
Zhejiang Hengjiu Saw Chain Co., Ltd. uses precision stamping and automated heat treatment to ensure exact drive link tolerances, resulting in smooth engagement and consistent cutting performance.
Key takeaway for choosing the right saw chain
Correct saw chain selection requires matching bar length, pitch, gauge, and drive link count exactly. Measuring only the bar is not enough. Accurate measurement improves cutting efficiency, reduces wear, and enhances operator safety—especially when using professionally manufactured chains designed for durability and precision.
