How to Choose the Right Sealey Drill Bit
Start with the material you are drilling, then choose the diameter, bit type and shank that suit the machine. This guide helps you avoid choosing a bit by size alone.
Material + diameter + drill
The same nominal diameter can be available in different bit constructions for different materials and machines.
Identify the material
Bit geometry and material should suit what you are drilling.
Choose the diameter
Use the hole size required by the fastener, tapping operation or process.
Check shank capacity
Large bits may use reduced or specialised shanks.
Use correct speed and feed
Cutting conditions have a major effect on heat, finish and bit life.
What should you check before ordering?
Use the selection points below to narrow the range before comparing individual products.
Bit type matters
A drill bit designed for one material may perform poorly or unsafely in another.
- Use suitable HSS or specialist bits for metals.
- Use masonry bits with compatible drilling equipment for masonry applications.
- Use wood-specific designs where clean timber holes are required.
Diameter and hole purpose
The correct diameter depends on what the hole is for.
- Clearance holes need room for the fastener shank.
- Tapping holes require the correct tapping-drill size.
- Pilot holes may be intentionally smaller than the final hole.
Extending bit life
Correct speed, pressure and lubrication help reduce overheating and premature wear.
- Use cutting fluid where appropriate for metal drilling.
- Reduce speed as drill diameter increases.
- Keep bits sharp and replace damaged cutting edges.
Browse Sealey Individual Drill Bits
Search by part number, size or a keyword from the product description.
Tip: a short part-number fragment often finds the right product faster than a long description.
Products 1–20
Products 21–40
Products 41–46
Quick answers before you choose
Can one drill bit be used for every material?
No. Choose a bit design intended for the material and drilling method.
Why does a large drill bit have a smaller shank?
Some large-diameter bits use reduced shanks so they can fit a smaller drill chuck, but the machine must still be suitable for the cutting load.
What speed should I use?
Required spindle speed depends on bit diameter, bit material and the workpiece. Larger diameters generally require lower speeds.
Still not sure which one you need?
Send Tanair the existing part reference, equipment details and a clear photograph where useful. We can help you narrow the correct option before you order.