TCT Saw Blade Tooth Counts Explained for Wood, Metal, Aluminum

Quick answer

For general crosscutting and trimming of softwood and hardwood, a 24-tooth TCT blade cuts fast and clears chips well. For cutting aluminum, you generally want a higher tooth count with a negative hook angle and a blade rated for non-ferrous metal; tooth count alone does not make a wood blade safe for metal. Use a 24-tooth blade for fast framing and rough cuts, a 40-tooth for finish carpentry and trim, and a 60-tooth or higher for smooth crosscuts and thin stock.

How tooth count changes the cut

Tooth count is the number of carbide tips around the rim of the blade. More teeth means each tooth takes a smaller bite, so the cut is smoother but slower and generates more heat. Fewer teeth means each tooth takes a bigger bite, so the cut is faster and clears chips more aggressively, but the surface is rougher and the risk of tear-out on the exit side is higher. That trade-off is the whole story behind 24 vs 40 vs 60 tooth blade choices.

What tooth count should you use for wood?

For softwoods and hardwoods in a range of thicknesses, 24 teeth is a good general-purpose choice for fast cutting and trimming. It is also fine for occasional plywood, wood framing, and decking. If you are doing finish carpentry where the cut face will be visible, step up to 40 teeth. For crosscutting thin stock or making very smooth cuts, 60 teeth or more gives the cleanest edge but feeds more slowly.

How many teeth for cutting aluminum?

Aluminum is soft and gummy, so it needs a blade designed for non-ferrous metal, usually with a negative hook angle and a higher tooth count than a framing blade. A common starting point is 60 to 80 teeth for thin aluminum extrusions, and 80 to 100 teeth for thinner wall material. Do not use a standard wood-cutting TCT blade on aluminum unless the manufacturer specifically rates it for that material; the tooth geometry and hook angle are different, and a wood blade can grab and climb.

Can you use the same TCT blade for wood and metal?

Generally no. A TCT blade for wood vs metal differs in tooth geometry, hook angle, and carbide grade. Wood blades have a positive hook angle that pulls the work into the blade; metal-cutting blades often use a negative hook angle to reduce grabbing. Using a wood blade on metal can overheat the tips, dull the blade quickly, and create a kickback risk. If you cut both materials, keep separate blades and swap them.

Why does 24 vs 40 vs 60 tooth matter for trim cutting?

For trim cutting, the visible cut face is the priority. A 24-tooth blade leaves a rougher edge that may need sanding, while a 40-tooth blade gives a cleaner cut on most trim profiles. A 60-tooth blade gives the smoothest cut but cuts slower and can burn if you feed too slowly. Match the tooth count to how visible the cut will be and how much sanding you are willing to do.

Does tooth count affect blade diameter and safety?

Tooth count and diameter are independent, but both must match your saw. A 5-1/2-inch blade has a smaller circumference than a 7-1/4-inch blade, so it carries fewer teeth for the same tooth count. Always check the blade's maximum RPM rating against your saw's no-load speed. Never exceed the rated RPM, and let the blade come to full speed before entering the cut.

Tooth count quick reference

24 teeth

Fast cutting and trimming of softwoods and hardwoods, plus occasional plywood, framing, and decking. Choose 24 teeth when speed matters more than a sanding-ready finish.

40 teeth

General finish carpentry and trim cutting where the cut face will be visible. Step up to 40 teeth when you want less tear-out on trim.

60+ teeth

Smooth crosscuts in thin stock and non-ferrous metal blades for aluminum. Use a metal-rated blade for aluminum, not a wood blade with more teeth.

Product facts

• 5-1/2" 24 Tooth TCT Saw Blade for General Purpose Cutting & Trimming: 5-1/2" 24 Tooth TCT Saw Blade for General Purpose Cutting & Trimming is excellent for fast cutting and trimming softwoods and hardwoods in a range of thicknesses, with occasional cutting of plywood, wood framing, and decking. A 24-tooth blade is the right starting point for fast, general-purpose wood cutting where surface finish is less critical.
• SM-4 Pointed Cone Shape Premium Tungsten Carbide Burr: SM-4 Pointed Cone Shape Premium Tungsten Carbide Burr has a 1/4-inch shank and is great for narrow contours, surface machining, and getting at rounded edge and surface processing in small places. For detail work that a saw blade cannot reach, a pointed cone burr lets you shape and deburr tight contours after the cut.
• SC-5L Cylinder Shape Radius End PremiumTungsten Carbide Burr: SC-5L Cylinder Shape Radius End Premium Tungsten Carbide Burr has a 1/4-inch shank and is great for interior contour work like peripheral, circular arc, and face milling. A cylinder radius-end burr is useful for smoothing and milling interior contours on metal or wood parts that a saw blade leaves rough.