09 Facts About Hole Saws – In Depth Guide!

Regular drill bits are thinner in diameter and longer. Those are used to drill deep and thinner holes. But wider and shorter holes are not able to drill using such drill bits. So hole saws are really important to drill shorter and wider hole drilling tasks. A hole saw is not a kind of regular drill bit. It has been specially designed as a curved saw. So let’s see, in-depth detail about hole saws.

01. What Is a Hole Saw Used For?

Hole saws are designed with a cylindrical shape saw blade attachment to use with power drills to make perfectly round holes.

The efficiency of hole saws compared to flat and twist drill bits in drilling large intense holes or widening predrilled holes make them an essential tool in the electrical and plumbing industry.

If you are new to drilling, This Drilling Basic Guide will help you.

02. Hole Saw Sizes

Hole saws are available in many sizes. Those are 14mm – 210mm (9/16 in – 8 9/32 in) in sizes. Below are the all available hole saw sizes in millimeters and inches.

Hole saw sizes in mmHole saw sizes in inches
149/16
193/4
227/8
271. 1/16
321. 1/4
381. 1/2
411. 5/8
461. 13/16
512
572. 1/4
592. 5/16
602. 3/8
652. 9/16
682. 11/16
793. 1/8
833. 1/4
923. 5/8
983. 7/8
1054. 1/8
1144. 1/2
1214. 3/4
1335. 1/4
1686. 5/8
2108. 9/32
Hole saw sizes in millimeters and inches

Read More About – Drill Bit Sizes in inches and mm – Chart Guide

03. How To Use a Hole Saw?

Usually, hole saws are inserted on arbors or mandrels attached to a drill driver to create neat holes. If you are trying to mount a hole saw to a mandrel, follow the following steps. 

  1. Set the bit through the center hole, and keep screwing through the mounting plate tightly.
  2. Till the nubs of the plate get aligned with the holes, decompress the mounting plate.
  3. Push the mounting plate to the holes.
  4. Until the mandrel is secured to the hole saw, keep fastening the nut at the back of the mounting plate. 

There are hole saws available in a range of diameters and tooth sizes. Make sure to get the appropriate size for the work. 

Do not forget to pull the saw out and clean it out between the teeth to prevent saws from getting jammed up with the materials. Be careful in this process as the hole saws are more likely to be hot. If your hole saw is hot you can follow these 07 steps to cool the hole saw easily.

Normally a drill bit can be hot due to these 07 reasons.

Drill at a slower speed assuring that the hole saw cuts in the right place without wandering. If the hole saw has not cut through, when the drill bit enters through the other side of the material, turn the material to the other side, aligning the drill bit with the hole.  Complete the cut from the other side to prevent the material from blowing out.

04. How to Use a Hole Saw Using a Drill?

Cutting neat holes with hole saws using a drill demands talent and experience. Observe the following ways when using a hole saw with a drill.

These are the steps for using a Hole saw by attaching a drill

  • Always mount the exact size hole saw on the arbor.  For hole saws with a modifiable center bit, ensure it comes through past the toothed edge of the saw around 3/8 inch. Orient this with the setscrew, for a center bit flat spot on the shank. 
  • Fasten the set screw securing the bit. Eventually, tighten the hole saw to the chuck of a 3/8-inches corded variable speed drill. Use 18V or higher voltage drill as a lower voltage is insufficient
  • To get a flawlessly neat hole keep an even contact from the beginning. This will help to keep your drill at a proper angle.
  • Bending the drill or slamming a nail with the hole saw when drilling can make the saw bind and the drill motor swivel vigorously in the user’s hands. As the strong torque hit the drill into the user’s face or sprains the wrist, hold up the drill handle against your hip or leg to avoid these situations. 
  • Make sure that the drill goes vertical to resist binding the hole saw.
  • Do not wear loose clothing or jewelry while working to prevent them from getting tangled up in the hole saw.
  • Some drills have a trigger speed lock-on button. Avoid pressing it when you drill. 

Read More About – Choose the right types of drill using this guide.

05. Difference Between Hole Saw And Spade Bit

Hole SawSpade Bit
Pilot twist bit in the centerSharp point in the center
Poor chip clearanceAverage chip removal
Great for large diameter holes with a clean finish. Cannot drill blind holes.Ideal for drilling large diameter holes quickly and for blind holes.
Provide smooth and perfect holes.Provide rough holes.
Suitable for metal, masonry, and woodworking. Suitable only for woodworking.
Available from 7/8 inches – to 14 inches. Available from 1/4 inch to 1-1/2 inches.
Moderate speed cuttingFast speed cutting
Make neat and clean holes.With splinters, make irregular holes.
Slower than spade bitsDrill many holes in a shorter period.
More costly than spade bits.Less expensive than hole saws.
Difference Between Hole Saw And Spade Bit

06. Difference Between Hole Saw And Forstner Bit

Hole SawForstner Bit
UsabilityUsed to cut through holes in thin materialAppropriate for drilling neat holes which could be blind, flat bottomed, and go completely through the material.
CostHole saws are quite a bit cheaper than Forstner bits
Hole DepthThe length of the bit or saw affects the depth of the hole. According to the depth of the material, the hole can be flat bottomed, yet it will punch through
Quality of CutGives a nice finish. Still, it will not be clean like Forstner bits.Cut the neatest hole due to its design. 
Speed of CuttingCut faster than the Forstner bitDemands a lot of time to get a sharp, neat hole.
Difference Between Hole Saw And Forstner Bit

07. Types Of Hole Saws

Carbon SteelDo not use on denser materials.   

Use only on thin materials such as wood, non-laminated plastic, and plasterboard.
Variable Pitch Bi-MetallicBi-metal hole saws provide high security for the user as they will not break down when used continuously.   

Perfect for cutting materials such as plywood, hard wood, plasterboard, non-laminated plastics, and no ferrous materials.
Deep Cut Variable Pitch Bi-Metallic A forceful cutting strategy due to its updated NVP variable pitch layout and advanced tooth geometry.  
Constant Pitch Smooth CutHave a continual tooth pitch constructed of hardened, heat, and friction withstanding high-speed steel with a hard alloy structure. 

Perfect to use with cordless power drills (18 Volts). 
Tungsten Carbide Tipped Hole CutterA heavy-task general-purpose cutter and perfect to work on plastics, wood, MDF, and ceramic tiles.
Welded Shank Soffit CutterIncludes a non-detachable arbor fastened onto the base plate. 

Useful to cut holes in PVC, plywood, and metal.

The cut depth is around 47mm.
Diamond-Edged Hole SawHave an increased heat and wear obstruction that makes them extremely durable.

Although these saws have high heat resistance, it is recommended to moisten them in water to cool off the blade.  

Mainly used for drilling through ceramic tiles.
Multi-Hole SawMainly for cutting various diameter holes in sizes (26, 32, 38, 45, 50, 56_ 63mm) and cutting holes till 42mm. 

Can be used on plywood, wood, chipboard,non-laminated plastics, non-ferrous metals, and plasterboard.  Do not use stainless steel. 
Types Of Hole Saws

08. Hole Saw Resharpening And Maintenance

  • Regular cleaning expands the lifespan of the saw. cleanse saws after using them to protect them from dirt, wood fragments, and filings, which make hole saws get stuck in the material or strip and harm the saw teeth. 
  • When using your hole saw, do not forget to back the saw out of the hole frequently, which assists to clean the teeth from wood particles and dust, restraining the blade from getting hot, and preventing tooth damage.
  • Use balanced pressure and ensure the hole saw teeth interact with the material in an equal manner. This will help to reduce unequal sawing and avoid tooth stripping.
  • When using metals, use good cutting oil to clear chips. Lubrication assures a smoother cutting action with minimum friction, expanding the lifespan of the hole saw.
  • Due to the amount of damage and friction a hole saw undergoes while using it, it is wise to replace it before the arbor. 
  • Always store hole saws in a secure, dry place.

Read More About – Sharpening Drill Bits – (Twist-Spade-Brad-Spur-Forstner)

09. Can I Use a Wood Hole Saw In Metal?

For metal, You can use bimetal hole saws and maintain the teeth sharp-edged and lengthy with lubricating oil.

However when cutting holes in steel doors for deadbolts, cut many holes, and for metal, step up to a bimetal hole saw.

The teeth are strong as they are designed with tougher steel. Yet that does not imply they are unbreakable.  Lubricate well when drilling into metal. If you can not find cutting oil, use regular motor oil. 

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