What does tooth count change?

Cutting speed and edge quality. 18-24 for fast ripping, 40-60 for clean cross cuts, 60-80 for laminate and MDF.

Can a timber blade cut metal?

It should not. Metal needs carbide tipped blades running slow; a timber blade loses teeth and is dangerous in metal.

What if the bore does not match?

A reducing ring works in some cases but lowers centring accuracy and raises vibration. The right answer is a blade with the correct bore for the machine.

What is a negative rake blade for?

The teeth shear rather than pull into the work, which gives a more controlled, cleaner cut in aluminium, laminate and on mitre saws.

What does the speed marked on a blade mean?

The maximum speed the blade withstands, and it must be higher than the machine's. Fitting a lower-rated blade to a faster machine is dangerous.

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Circular Saw Blades

Three figures decide a circular saw blade: outside diameter, bore, and tooth count. Tooth count sets the finish and tooth geometry decides the material. The catalogue holds over 210 blades.

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Tooth count and material

Fewer teeth cut fast and rough, more teeth cut slow and clean. Choose by material first, then by the finish you need.

Material	Teeth	Note
Ripping timber	18-24	Fast feed, rough edge
Cross-cutting timber	40-60	Clean edge
Laminate / MDF	60-80	No breakout
Aluminium	Negative rake, high count	Geometry that resists grabbing
Steel (cold cutting)	Carbide tipped, low speed	Chips, no sparks

Diameter, bore and speed

Outside diameter sets the machine's depth of cut and must not exceed what the machine allows. Bore size is machine specific; reducing rings work in some cases but reduce centring accuracy.

Every blade carries a maximum permitted speed, and it must exceed the machine's. In aluminium and laminate, negative rake blades do not grab the work and cut more controllably.

Frequently Asked Questions

What does tooth count change?
Cutting speed and edge quality. 18-24 for fast ripping, 40-60 for clean cross cuts, 60-80 for laminate and MDF.
Can a timber blade cut metal?
It should not. Metal needs carbide tipped blades running slow; a timber blade loses teeth and is dangerous in metal.
What if the bore does not match?
A reducing ring works in some cases but lowers centring accuracy and raises vibration. The right answer is a blade with the correct bore for the machine.
What is a negative rake blade for?
The teeth shear rather than pull into the work, which gives a more controlled, cleaner cut in aluminium, laminate and on mitre saws.
What does the speed marked on a blade mean?
The maximum speed the blade withstands, and it must be higher than the machine's. Fitting a lower-rated blade to a faster machine is dangerous.