Understanding Bandsaw Blade Thickness and How to Check It
Blade thickness (sometimes called gauge) is the distance between the two flat sides of the band, measured on the body of the blade rather than across the set teeth. In the UK it is usually given in millimetres. Thickness affects how stiff the blade is, how much tension it needs, how well it copes with being flexed around the wheels and how wide a kerf it leaves.
This guide explains why thickness matters, how to measure it accurately, and how to tell whether a replacement blade is the right thickness for your machine.
Key Aspects of Bandsaw Blade Thickness
- Cutting Capacity: Blade thickness directly impacts the depth of cut a bandsaw can handle. Thicker blades are more rigid, handling deeper cuts and greater cutting forces, while thinner blades offer flexibility for intricate cuts and narrower kerfs.
- Resawing Capability: In resawing, thicker blades are preferred for their stability, allowing them to cut boards into thinner sections while reducing blade drift (the tendency for the blade to veer off course).
- Blade Life and Durability: Thicker blades typically last longer and withstand demanding tasks with less risk of fatigue, heat buildup, and deflection. Thinner blades may wear more quickly, especially during heavy-duty cutting.
- Blade Tension Requirements: Thicker blades require higher tension to maintain their shape and prevent bending. Thinner blades need less tension but still perform accurately when properly adjusted.
- Cutting Accuracy: Thinner blades create narrower kerfs, minimizing material waste and delivering fine, intricate cuts. Thicker blades, though they create wider kerfs, provide stability ideal for straight cuts and resawing.
- Material Compatibility: Hardwoods and dense metals generally require thicker blades to handle increased cutting forces, while thinner blades work best on softer woods and lighter materials.
How to Measure Bandsaw Blade Thickness
Accurately measuring blade thickness is essential for ensuring performance, safety, and longevity. Follow these steps to measure the thickness of a bandsaw blade:
- Prioritize Safety: Start by unplugging the machine and ensuring it’s powered off. This precaution prevents accidental startup while you handle the blade.
- Gather Your Tools: Use a precision measuring tool, such as a caliper or micrometer. Micrometers generally provide higher accuracy. Ensure that the tool is clean and calibrated before use.
- Choose a Measuring Point: Select the middle section of the blade for the most accurate reading, avoiding welds or damaged areas, which can skew measurements.
- Position the Tool: Open the caliper’s jaws or adjust the micrometer’s spindle and anvil slightly wider than the blade thickness.
- Insert the Blade: Carefully place the bandsaw blade between the measuring surfaces, ensuring even placement. Close the tool gradually, applying slight pressure to secure it without over-tightening.
- Read the Measurement: Take note of the reading in inches or millimeters, referencing the scale on the caliper or micrometer. For best results, repeat this process at multiple points along the blade to confirm consistency.
- Compare with Manufacturer Specifications: Check your measurements against the blade’s recommended thickness in the manufacturer’s guidelines to ensure optimal performance.
- Record and Store: After measuring, clean and store your tool properly. Document the measurement and date for future reference or when purchasing replacement blades.
Thickness is not the same as width or kerf
It is easy to mix these up when ordering:
- Width is measured from the tips of the teeth to the back edge of the blade. It mostly decides how tight a curve you can cut. See bandsaw blade width.
- Thickness is the body of the band, side to side. Measure it away from the teeth.
- Kerf is the width of the cut the teeth make. Because the teeth are set to each side, the kerf is always wider than the blade body. Our guide What is bandsaw blade kerf? explains more.
For the full picture of how a blade is specified, including length and TPI, read how are bandsaw blades measured.
Thickness and wheel size
Every time the blade passes over a wheel it is bent and then straightened again. A thicker band is stiffer and resists twisting and deflection in the cut, but it is also put under more stress each time it flexes. On machines with small wheels, a blade that is thicker than the machine is designed for is more likely to crack from the back edge or at the weld. Always check your machine manual for the recommended blade thickness, and see preventing bandsaw blade fractures and weld breakages if blades are cracking early.
Quick checklist before you order
- Measure the thickness on the flat body of the blade, clear of the teeth and the weld.
- Take readings at two or three points and use the consistent figure.
- Check the figure against your machine manual.
- Measure the length and width at the same time so you have the full size. If you are unsure, our guide What size is my blade? will help.
Common mistakes
- Measuring across the teeth, which includes the set and gives a reading that is too large.
- Measuring at the weld, where the thickness can differ slightly from the rest of the band.
- Assuming a thicker blade is always better. On a small machine it can shorten blade life rather than extend it.
- Using a worn or dirty caliper. Wipe the jaws and check the tool reads zero when closed.
By following these steps and adhering to the recommended tolerances, you can accurately measure and maintain bandsaw blade thickness, ensuring precision and safety in every cut.
Please always follow your bandsaw machine manufacturers manual for all bandsaw related questions and answers.
Frequently asked questions
Where should I measure bandsaw blade thickness?
On the flat body of the blade, between the back edge and the base of the teeth, away from the weld. Measuring across the teeth includes the tooth set and will over-state the thickness.
Can I use a thicker blade than my machine recommends?
It is not advisable. A thicker band needs more tension and is stressed more as it bends round the wheels, so on a machine not designed for it the blade is more likely to crack. Stick to the thickness in your machine manual.
Does blade thickness change the width of the cut?
Yes, to a degree. The kerf is set by the body thickness plus the tooth set, so a thicker blade generally leaves a wider cut and removes more material.
What tool do I need to measure blade thickness?
A digital or vernier caliper is fine for most purposes. A micrometer gives a more precise reading if you need one. Either way, make sure the jaws are clean and the tool reads zero when closed.
To order your bandsaw blade, order your bandsaw blade online.
Last reviewed: 27 October 2026