Band Saw Blade Teeth Per Inch Chart: Fit, Blade Material, and Cut Quality
You need to choose the right TPI for your band saw blade and you want a chart to help. TPI (teeth per inch) is one of the most important blade specifications. The wrong TPI produces rough cuts, slow cutting, or blade damage. You need to know how to select TPI by material thickness and type.
TPI (teeth per inch) is the number of teeth on the blade per inch of length. Higher TPI produces smoother cuts but cuts slower. Lower TPI cuts faster but produces rougher cuts. The correct TPI depends on the material thickness and type.
TPI Selection Chart
Woodworking TPI Chart
| TPI | Best For | Material Thickness | Cut Quality | Speed |
|---|---|---|---|---|
| 3 TPI | Resawing, thick stock | 2 to 6+ inches | Fair | Fast |
| 4 TPI | General woodworking | 3/4 to 4 inches | Fair to good | Fast |
| 6 TPI | General woodworking | 1/2 to 3 inches | Good | Medium |
| 8 TPI | Smoother cuts | 1/4 to 2 inches | Good | Medium |
| 10 TPI | Thin stock | 1/4 inch and under | Good to excellent | Slow |
| 14 TPI | Scroll work, thin stock | 1/8 inch and under | Excellent | Slow |
Metal Cutting TPI Chart
| TPI | Best For | Material Thickness | Speed (FPM) |
|---|---|---|---|
| 6 to 8 TPI | Thick solid bar | 1 to 4 inches | 60 to 100 |
| 10 TPI | General metal cutting | 1/4 to 2 inches | 100 to 200 |
| 14 TPI | Medium thickness | 1/8 to 1 inch | 100 to 200 |
| 18 TPI | Thin material, conduit | Under 1/4 inch | 200 to 300 |
| 24 TPI | Very thin sheet metal | Under 1/8 inch | 200 to 300 |
| 10/14 variable pitch | Mixed thicknesses | All | 100 to 200 |
The 3-Teeth Rule
The most important rule of TPI selection: at least 3 teeth should be in the material at all times.
Why:
- Too few teeth: The teeth grab the material, causing rough cuts, vibration, and potential tooth damage.
- Too many teeth: The gullets fill with chips before they exit the material, causing blade loading, slow cutting, and premature dulling.
How to apply:
- Measure the material thickness.
- Choose a TPI where at least 3 teeth fit within the material thickness.
- Example: For 1/2 inch thick material, you need at least 6 TPI (3 teeth x 6 TPI = 1/2 inch).
Tooth Profiles
Standard Tooth (0 Degree Rake)
Good balance of cutting speed and surface finish. The most common profile for general-purpose cutting.
Best for: General woodworking, general metal cutting. Cut quality: Good.
Hook Tooth (Positive Rake)
The positive rake angle pulls the blade through the material. Cuts aggressively.
Best for: Hardwoods, thick stock, resawing, thick metal bar. Cut quality: Fair. Aggressive cut produces rougher surface.
Skip Tooth (Large Gullets)
Large gullets clear sawdust and chips efficiently. Good for soft or gummy materials.
Best for: Softwoods, particleboard, MDF, aluminum. Cut quality: Fair to good.
Variable Pitch (Alternating Teeth)
Alternating TPI (e.g., 10/14) reduces vibration and handles mixed thicknesses.
Best for: Mixed material thicknesses, production cutting. Cut quality: Good to excellent. Reduced vibration produces smoother cuts.
Blade Material and TPI Compatibility
Carbon Steel
Available TPI: 3 to 24 TPI. Best for: Woodworking. Not suitable for: Metal cutting (softens at high temperature).
Bi-Metal M42
Available TPI: 3 to 24 TPI. Best for: Woodworking, resawing, metal cutting. Hardness: 67 to 69 HRC.
Bi-Metal M51
Available TPI: 6 to 24 TPI. Best for: Tough metals, stainless steel. Hardness: 69 to 70 HRC.
Carbide-Tipped
Available TPI: 3 to 14 TPI (limited range). Best for: Production cutting, abrasive materials. Hardness: 70+ HRC.
TPI and Cut Quality
Factors That Affect Cut Quality
- TPI: Correct TPI for the material thickness is the most important factor.
- Blade sharpness: A sharp blade produces smooth cuts. Replace when cuts become rough.
- Blade tension: 15,000 to 20,000 PSI for standard blades.
- Feed rate: Steady, consistent pressure. Do not force the cut.
- Blade guides: Properly adjusted guides prevent blade wander.
- Tire condition: Good tires provide traction and absorb shock.
Signs of Wrong TPI
Too few teeth (TPI too low):
- Rough, torn cuts
- Excessive vibration
- Teeth grabbing the material
- Potential tooth breakage
Too many teeth (TPI too high):
- Slow cutting
- Blade loading (gullets filling with chips)
- Burning (blue discoloration on wood)
- Premature dulling from rubbing
FAQ
What TPI should I use for my band saw blade?
Use the 3-teeth rule: at least 3 teeth should be in the material at all times. For 1/2 inch material, use 6 TPI or higher. For 2 inch material, use 3 TPI or higher. For thin sheet metal, use 18 to 24 TPI.
What is the difference between 3 TPI and 6 TPI?
3 TPI has fewer, larger teeth. It cuts faster and is better for thick material (2 to 6+ inches). 6 TPI has more, smaller teeth. It produces smoother cuts and is better for medium material (1/2 to 3 inches).
What is variable pitch (10/14 TPI)?
A blade with alternating TPI of 10 and 14. The alternating teeth reduce vibration and handle mixed material thicknesses. Produces smoother cuts and less noise than constant TPI.
References
- Olson Saw. “Band Saw Blade TPI Guide.” Olson Saw Company.
- LENOX Tools. “Blade Selection Guide.” LENOX Industrial Division.
- Starrett. “Bi-Metal Blade TPI Chart.” L.S. Starrett Company.
- Fine Woodworking. “Band Saw Blade Selection.” Taunton Press.
- Modern Machine Shop. “Band Saw Cutting Speeds and Feeds.” Gardner Business Media.
