Fast 1 Inch HSS BI Metal Hole Saw Cutter 38mm

A now common tool that should be in any DIY’er’s toolbox, the hole saw is the perfect attachment to make large holes in materials. Most hole saw models are the same, including the same key parts of a cutting blade, slots, arbor and a drill bit. Read our full guide on the parts of a hole saw to find out more about each part and its purpose

Cylindrical Cutting Blade on a Hole Saw

Generally speaking, the fewer teeth per inch on a blade, the larger those teeth tend to be, and the deeper the gullets. This means that with each stroke of the saw, a larger quantity of material is being cut and removed.

As a result, a blade with fewer, larger teeth per inch will cut much quicker than one with more teeth. However, because of this aggressive cutting action, there is a greater chance that the material’s fibres will become torn, creating a rough finish

Saw Teeth

The serrated saw teeth of a hole saw are typically set at a 60° angle. This is so that the teeth can “bite” into the material you are cutting

Variable Pitch

Pitch is defined as the distance between the points of two teeth on a saw blade. Therefore, a variable pitch is when the distance between the teeth varies. This irregular set-up actually helps to break sawing rhythms and reduce harmonic vibrations.

Constant Pitch

• A constant pitch is when the distance between those two points remains constant all along the saw. 
• Saw blades with a constant pitch and a higher TPI (Teeth Per Inch) cut a little slower than variable pitch blades but they make a finer cut

TPI

TPI stands for ‘Teeth Per Inch’ and is a way of measuring the frequency of teeth on a saw blade. Usually abbreviated to TPI, as in, “a blade consisting of 18 TPI”.

Hole Saw Slots

• The slots in the cylinder walls of the cutting blade allow chips and dust to escape more easily. Holes clogged with dust are the chief reason for stuck saw blades.
• The amount of slots may vary depending on the make or model, but between 2-6 slots is common on most hole saws. Having more slots is advantageous as this will allow dust and chippings to escape, but you will rarely find hole saws with more slots as this also compromises the strength of the hole saw.
• Most slots slope away from the direction that the saw spins to allow dust to escape, though some models may have vertical or even circular slots instead. Whether the slots slope, are circular or straight has very little difference overall, but it is advised to unclog them occasionally as they do help to keep the hole saw cutting effectively.

Hole Saw Arbor

An arbor is a type of tool bit that can be used to grip other moving tool components. It is essentially a shaft that supports a rotating part.

Arbors are used in many different applications and in combination with various tools. It is worth noting here that not all hole saws will be supplied with an arbor and it may have to be purchased separately.

Arbors are often found holding hole saws, buffing wheels, drill bits, circular saw blades and sanding discs onto drills, saws, and other power tools.

Hole Saw Drill Bit

Note that, although common, not all arbors have a drill bit attached. The function of the drill bit on the end of the arbor is to create a pilot hole to decrease the chance of the hole saw ‘wandering’ when cutting. The blunt hexagonal end of the arbor is inserted into and clasped by a power drill’s chuck.

Hole Saw Ejector Spring

 Some arbors come with a spring placed over the drill bit called an ejector spring. This spring uses stored mechanical energy to eject the slug from the cylindrical saw blade after your hole has been cut.

When a hole saw fitted with an ejector spring cuts into a workpiece, the spring is condensed against the back plate of the hole saw.

When you have finished sawing your hole, the condensed spring expands and forces out the slug of waste material.

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