Saw blade size is more than one number printed on the blade body. A complete saw blade specification includes diameter, bore size, kerf width, plate thickness, tooth count, pin holes, cutting capacity and sometimes body design details such as expansion slots or wiper teeth.
For buyers, engineers and purchasing teams, reading these dimensions correctly is important because a small mistake can lead to poor cutting quality, machine incompatibility, excessive material loss, vibration, burning, tooth breakage or quotation errors.
This guide explains the most important saw blade dimensions and how they work together when selecting or ordering industrial saw blades.
Quick Example: How to Read a Saw Blade Size
A saw blade may be described like this:
355 × 3.2 / 2.5 × 25.4 mm × 80T
This usually means:
| Specification | Meaning |
|---|---|
| 355 mm | Outer diameter of the blade |
| 3.2 mm | Kerf width, or cutting width |
| 2.5 mm | Plate thickness, or body thickness |
| 25.4 mm | Bore size / arbor hole diameter |
| 80T | 80 teeth |
Some suppliers may write the same information in a different order, such as:
- 355mm x 80T x 25.4mm bore x 3.2mm kerf
- D355 B25.4 K3.2 T80
- Ø355 × 25.4 × 3.2 × 80T
Before confirming an order, always check what each number means. Do not assume that every supplier uses the same sequence.
1. Saw Blade Diameter
Saw blade diameter is the outside diameter of the blade, usually measured in millimeters or inches. It is one of the first dimensions buyers notice because it determines whether the blade physically fits the machine and how deep the blade can cut.
Why diameter matters
Blade diameter affects:
- Maximum cutting depth
- Machine compatibility
- Cutting speed at the tooth tip
- Blade stiffness
- Number of teeth that can fit on the blade
- Cutting stability in large cross-sections
A larger blade can usually cut deeper, but it also requires the machine to have enough guarding space, spindle power, flange support and rigidity.
Common diameter examples
Common circular saw blade diameters include:
- 185 mm / 7-1/4 inch for handheld tools
- 250 mm to 300 mm for woodworking and aluminum cutting machines
- 305 mm to 405 mm for industrial aluminum and metal cutting
- 450 mm to 610 mm for larger profiles, tubes and bar applications
- Larger custom diameters for special industrial machines
For industrial cutting, never choose blade diameter by guesswork. Use the machine manual or confirm the permitted diameter range with the machine supplier.
Diameter and cutting capacity are not the same
A common mistake is assuming that a 350 mm blade can cut a 350 mm workpiece. It cannot. The actual cutting capacity depends on the machine design, blade exposure, fixture height, clamp position and cutting angle.
For example, a 355 mm blade may cut a certain aluminum profile well, but it may not have enough effective depth for a large solid bar. Always check the machine's real cutting capacity, not only the blade diameter.
2. Bore Size / Arbor Hole Size
Bore size, also called arbor size or center hole diameter, is the hole in the center of the blade. It must match the machine spindle or arbor.
Why bore size matters
If the bore is too small, the blade cannot be installed. If the bore is too large, the blade may not center correctly unless a properly machined reducing ring is used. Poor centering can cause runout, vibration, noise, poor finish and uneven tooth wear.
Common bore sizes
Common bore sizes include:
- 16 mm
- 20 mm
- 22.23 mm
- 25.4 mm / 1 inch
- 30 mm
- 32 mm
- 40 mm
- 50 mm
- Custom machine-specific bore sizes
Industrial metal cutting machines often use larger and more specific bore dimensions than handheld woodworking saws.
Can you use a reducing ring?
A reducing ring can adapt a larger bore blade to a smaller spindle, but it must be accurate and stable. For high-speed or precision cutting, poor-quality reducing rings are risky. They can increase runout and reduce cutting accuracy.
For production cutting, the safest choice is usually to order the correct bore size directly.
For more details, see WRYNO's Saw Blade Bore Size Guide.
3. Kerf Width
Kerf width is the width of material removed by the blade during cutting. It is usually close to the width of the tooth tips, not the steel plate body.
Why kerf matters
Kerf affects:
- Material loss per cut
- Cutting force
- Chip size
- Required machine power
- Cut surface finish
- Blade stiffness and stability
- Heat generation
A wider kerf removes more material and usually needs more power. A thinner kerf reduces material loss, but it may be less stable if the blade body is too thin or the machine is not rigid.
Thin kerf vs standard kerf
Thin kerf blades can be attractive when cutting expensive materials, such as aluminum, copper or high-value alloys. Reducing kerf by even 0.5 mm can save a meaningful amount of material in high-volume production.
However, thin kerf is not always better. On large-diameter solid bars, thick tubes or unstable machines, a blade that is too thin may deflect, vibrate or produce poor straightness.
Use thin kerf when:
- Material saving is important
- The machine is stable
- Workpiece clamping is good
- Cutting load is moderate
- Cut straightness can be controlled
Use standard or heavier kerf when:
- The workpiece is large or difficult to clamp
- Machine rigidity is limited
- Cutting accuracy and stability matter more than material saving
- Tooth strength needs to be higher
For a deeper comparison, see Thin Kerf vs Standard Kerf Saw Blade.
4. Plate Thickness / Body Thickness
Plate thickness is the thickness of the steel blade body before the tooth tips. It is usually slightly thinner than the kerf width.
For example:
Kerf: 3.2 mm / Plate thickness: 2.5 mm
This means the tooth tips cut a 3.2 mm slot, while the blade body is 2.5 mm thick.
Why plate thickness matters
Plate thickness affects blade stiffness, vibration resistance and cutting stability. A thicker plate is usually more rigid, but it also increases weight and may require a wider kerf. A thinner plate reduces material loss but can be more sensitive to heat and vibration.
Kerf and plate thickness must work together
The difference between kerf and plate thickness provides side clearance. If the clearance is too small, the blade body may rub the cut surface, causing heat, noise and burn marks. If the clearance is too large, the blade may feel aggressive or unstable depending on tooth design.
A good blade design balances:
- Tooth width
- Plate thickness
- Side clearance
- Workpiece material
- Cutting speed
- Feed rate
- Machine rigidity
This is why kerf and plate thickness should not be selected separately.
5. Tooth Count
Tooth count is the number of teeth on the blade, usually written as 40T, 60T, 80T, 100T and so on.
Why tooth count matters
Tooth count affects:
- Surface finish
- Cutting speed
- Chip size
- Feed smoothness
- Heat generation
- Tooth load
- Burr formation
More teeth usually produce a smoother finish, but only if the feed rate and chip load are correct. Too many teeth can create heat because each tooth may take too small a chip and rub instead of cutting.
Fewer teeth usually cut faster and leave more room for chip evacuation, but the finish may be rougher.
Tooth count depends on workpiece thickness
A thin aluminum profile may need more teeth engaged to avoid grabbing and vibration. A large solid bar may need fewer teeth or a tooth design with better chip space to remove chips effectively.
This is why a blade that works well on thin-wall tube may not work well on a large solid bar even if the diameter is the same.
For more detail, see:
6. Pin Holes and Drive Holes
Many industrial saw blades have additional holes around the center bore. These are often called pin holes, drive holes or mounting holes. They help position the blade or transmit torque on certain machines.
Why pin holes matter
Even if the main bore size is correct, missing or incorrect pin holes can make the blade unusable on some machines.
When ordering custom blades, provide:
- Number of pin holes
- Pin hole diameter
- Bolt circle diameter / PCD of the pin holes
- Distance from center bore
- Hole layout drawing if possible
Be careful: PCD can mean two different things in saw blade discussions.
- PCD as polycrystalline diamond: a diamond cutting material
- PCD as pitch circle diameter: the circle diameter of mounting holes
When talking about pin holes, PCD usually means pitch circle diameter.
7. Cutting Capacity
Cutting capacity is the maximum workpiece size the machine and blade combination can cut. It is not only a blade dimension, but it is critical for blade selection.
Factors that affect cutting capacity
Cutting capacity depends on:
- Blade diameter
- Machine stroke
- Blade guard and exposure
- Clamp position
- Workpiece shape
- Cutting angle
- Fixture height
- Arbor position
A machine may cut a rectangular profile larger than a round bar because the blade engagement and fixture position are different. For round solid bars, effective cutting depth can be more demanding.
Large-diameter bar cutting
For large-diameter aluminum, steel or high-silicon aluminum bars, blade selection becomes more sensitive. Diameter, kerf, tooth count, tooth geometry, machine rigidity and chip evacuation must be considered together.
For example, when cutting a large-diameter high-silicon aluminum bar, a buyer may compare TCT carbide, PCD diamond, band saw, waterjet and laser options. In that case, blade size is only one part of the selection process.
See also: Large-Diameter Bar Cutting Guide: Saw Blade, Band Saw, Waterjet or Laser?.
8. Blade Body Design
Some dimensions are not always included in a basic size code, but they still affect performance.
Expansion slots
Expansion slots help manage heat and reduce stress in the blade body. They are common on larger blades and blades used in higher-friction cutting.
Noise-reduction slots
Some blades include laser-cut slots or damping features to reduce vibration and noise. This is useful in applications where finish, operator comfort or sound control matters.
Wiper teeth
Some blades use wiper teeth or special tooth geometry to improve surface finish, especially in aluminum and non-ferrous cutting.
Coating and surface treatment
Coatings can reduce friction, improve chip flow or increase wear resistance. However, coating cannot compensate for the wrong blade size or tooth geometry.
9. Metric vs Inch Saw Blade Sizes
Saw blade sizes may be written in metric or inch units.
Common conversions include:
| Inch size | Approximate metric size |
|---|---|
| 7-1/4 in | 184 / 185 mm |
| 10 in | 254 / 255 mm |
| 12 in | 305 mm |
| 14 in | 355 mm |
| 16 in | 405 mm |
| 18 in | 455 mm |
| 20 in | 500 / 510 mm |
| 24 in | 610 mm |
Do not rely only on approximate conversion when ordering industrial blades. A 10-inch blade and a 255 mm blade may be close, but machine clearance and guard design can still matter.
For precision orders, confirm the exact millimeter dimensions.
10. What Information Should Buyers Provide for a Quote?
To get an accurate saw blade quotation, provide as much of the following information as possible:
- Blade outer diameter
- Bore size / arbor hole size
- Kerf width
- Plate thickness
- Tooth count
- Tooth geometry if known
- Pin hole layout or drawing
- Workpiece material and grade
- Workpiece shape and size
- Machine model
- Cutting method: dry, mist, coolant or lubrication
- Target cut quality
- Expected production volume
- Current problem if replacing an old blade
If you do not know all dimensions, send a photo of the existing blade marking, machine nameplate and workpiece. A blade supplier can often help interpret the missing information.
See also: Custom Saw Blade Quotation Checklist.
Common Size Selection Mistakes
Mistake 1: Matching only the diameter
Two blades with the same diameter can have different bore sizes, kerf widths, plate thicknesses, tooth counts and tooth geometries. Diameter alone is not enough.
Mistake 2: Ignoring bore accuracy
A loose or poorly centered blade can cause vibration and poor finish even if the tooth design is correct.
Mistake 3: Choosing the thinnest kerf without checking stability
Thin kerf saves material, but it also requires good machine rigidity and stable clamping.
Mistake 4: Using too many teeth for thick material
Too many teeth can reduce chip space and create heat in large cross-section cutting.
Mistake 5: Forgetting pin holes
A blade can match diameter and bore but still fail to mount if the pin hole pattern is wrong.
Mistake 6: Copying another factory's blade size without checking the machine
Two similar machines may have different spindle, guard or flange designs. Always confirm the actual machine specification.
Example: Choosing Size for Aluminum Profile Cutting
For aluminum profile cutting, buyers often focus on:
- Clean surface finish
- Low burr
- Accurate angle cutting
- Smooth feed
- Good chip evacuation
The blade diameter must match the machine, while tooth count and tooth geometry should match the profile wall thickness. A higher tooth count may improve finish on thin profiles, but chip space must remain sufficient.
Kerf should be stable enough for accuracy but not unnecessarily wide if material saving matters.
Example: Choosing Size for Solid Bar Cutting
For solid bar cutting, especially large-diameter bar, blade size selection becomes more demanding.
Important factors include:
- Machine power
- Blade stiffness
- Tooth count
- Chip space
- Kerf and plate balance
- Coolant or lubrication
- Workpiece clamping
A blade that is too fine-toothed may generate heat and clog with chips. A blade that is too thin may deflect. For large solid bars, it is often better to select a blade based on the material, diameter and machine condition rather than simply copying a general-purpose size.
Final Recommendation
A complete saw blade size specification should include more than blade diameter. For industrial cutting, buyers should confirm:
- Outer diameter
- Bore size
- Kerf width
- Plate thickness
- Tooth count
- Pin hole layout
- Machine compatibility
- Workpiece material and cutting capacity
These dimensions work together. Changing one dimension can affect cutting force, finish, heat, material loss and blade life.
If you need help selecting or quoting a saw blade, send WRYNO your current blade marking, machine model, workpiece material, diameter or wall thickness, cutting method and target finish. We can help confirm the correct size and recommend a practical blade specification.
FAQ
What does 355 × 3.2 / 2.5 × 25.4 mm × 80T mean?
It usually means a 355 mm blade diameter, 3.2 mm kerf width, 2.5 mm plate thickness, 25.4 mm bore size and 80 teeth. However, confirm the supplier's size order before placing an order.
Is saw blade bore size the same as arbor size?
Yes. Bore size and arbor size usually refer to the center hole of the blade and the machine spindle size. They must match accurately.
Is thin kerf always better?
No. Thin kerf reduces material loss but may reduce stability if the machine, clamping or workpiece is not suitable. Thin kerf works best on stable machines and controlled cutting conditions.
How do I choose saw blade diameter?
Start with the machine manual. The blade diameter must fit the guard, spindle, flange and cutting capacity of the machine. Do not exceed the machine's rated blade diameter.
Why is plate thickness smaller than kerf width?
The tooth tips are wider than the blade body to create side clearance. This prevents the blade body from rubbing heavily against the cut surface.
What dimensions should I send for a custom saw blade quote?
Send blade diameter, bore size, kerf, plate thickness, tooth count, pin hole layout, workpiece material, machine model, cutting method and target finish. Photos or drawings are helpful.