We examine circular saw blade sizes UK. On the UK market you can buy circular saw blades in various different sizes. These are always measured by the diameter of the blade and usually are shown in millimeters (mm). They are made by a number of tool brands. You can buy them for different types of cutting, such as cutting wood, cutting laminates, etc. Please see the circular saw blade sizing table below for all the available sizes.

Circular Saw Blade Size Chart

There are three things to look for when looking at circular saw blade sizes UK.

  1. The diameter of the blade as this will determine if the blade will fit your saw
  2. The bore diameter as this also determines if the blade will fit on your saw
  3. The number of teeth as that determines how fine and precise the cut will be.

One other very important consideration is to understand the cutting depth of any circular saw blade. We explain that in more detail below.

The cutting depth will change slightly depending on the bore size of the blade. The larger the bore size, the smaller depth it will cut. Manufacturers use different size bores on their blades. The sizes we have used below are averages. It is also worth knowing that larger sized blades have large sized bores.

Some people prefer to use inches so we have included that as a measurement.

Blade Size (mm)

Cutting Depth (mm)

Blade Size (inches)

Cutting Depth (inches)

115mm

45mm

4.5"

1.7"

125mm

50mm

5"

1.9"

136mm

60mm

5.35"

2.36"

150mm

70mm

5.9"

2.75"

160mm

75mm

6.3"

2.95"

165mm

80mm

6.5"

2.85"

180mm

82mm

7.1"

3.2"

184mm

83mm

7.24"

3.3"

185mm

84mm

7.25"

3.4"

190mm

85mm

7.5"

3.5"

210mm

90mm

8.25"

3.55"

216mm

92mm

8.5"

3.7"

240mm

100

9.5"

3.9"

250mm

105mm

9.84"

4"

255mm

110mm

10"

4.3"

355mm

164mm

14"

6.4"

Mini Circular Saw Blade Size Chart

There are also mini circular saws on the UK market. These use a smaller blade and we have provided a list below of the various sizes of those mini circular saw blades.

Blade Size (mm)

Cutting Depth (mm)

Blade Size (inches)

Cutting Depth (inches)

85mm

35mm

3.35"

1.37"

89mm

37mm

3.5"

1.45"

115mm

52.75

4.5"

2"

120mm

54mm

4.7"

2.1"

125mm

56mm

4.9"

2.2"

Which Circular Saw Blade Size Should You Buy?

There are two types of circular saw, a standard circular saw or a mini circular saw. Mini circular saws will take smaller blades sizes as shown above. The most popular size is 85mm but always worth checking. The exact size is always determined by the size of your saw.

How to work out what circular saw blade size you need?

When trying to figure out what size of blade you need, the best starting point is to look closely at your circular saw.

Does it have a blade?

If there is a blade already on it then it will have a size usually shown as something like 165mm x 20mm. The 165mm refers to the diameter of the blade and the 20mm refers to the bore size. See the diagram below for a clear illustration.
If there is a blade then it will be easy to find the exact size. However sometimes that has worn off. That makes it slightly harder to figure out.

Finding the size with just the saw

The best way to do this is to make a note of the brand and model and then look it up online. As long as the saw is not too old, then you should be able to find it. If the saw is really old, then email the manufacturer as they will be able to help you. This is also a good time to explain what bore size means on a blade. On a circular saw the centre of the blade has a hole in it. This is known as the bore. That fits over a spindle of the saw which turns the blade. There are various bore sizes depending on the brand of your saw.

Bore Sizes of circular saw blades

Bore sizes are fairly standard for saw blades:

  • 16mm (0.63”)
  • 20mm  (0.79”)
  • 25.4mm (1.00”)- used by the Evolution brand
  • 30mm (1.18”) – Used for bigger blades

Hopefully you are better informed about circular saw blade sizes. They range in sizes from 115-355 mm with bore sizes ranging from 16-30mm. The circular saw that you own determines the appropriate blade size. You can always fit a smaller blade to a larger saw, but not the other way around.

Picking the right circular saw blade for various tasks

Just below you can see an image of a circular saw blade showing the most important buying considerations. Those include the blade diameter (size), the bore size, the number of teeth and the direction in which the blade should be fitted.

parts of a circular saw blade diagram

Here are a few important things to consider and we have listed those below:

  • What material are you cutting? - For most people this will be wood. However different types of blades are available that allow you to cut metal, plastic, non-ferrous and composite materials
  • The depth of cut - This is the next really important selection criteria. The depth a blade can cut depends on the size of the blade. Blades are measured by their diameter. To calculate the cutting depth subtract the bore size from the blade size and divide by 2.
  • The bore size - This is the hole size in the centre of the blade. It can be made smaller using reduction rings
  • Number of teeth -  the more teeth the finer the cut will be
  • Blade thickness - measured in millimetres and the thinner the blade the finer the cut.
  • Tooth design - This varies depending on the material you want to cut. The gullet is the space between the teeth and the larger this gap the faster the cut will be. Likewise the blade and teeth tip material will also depend on the material being cut
  • Expansion Slot -  This allows the blade to expand as it starts to heat up
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