Drilling a hole in a stainless steel sink is a precise task that requires the right tools, proper technique, and careful preparation to avoid damaging the surface or warping the steel. Whether you’re installing a faucet, soap dispenser, water filter, or sprayer, this step-by-step guide will show you how to do it safely and cleanly.
| Tool / Material | Purpose |
|---|---|
| Variable-speed drill | Provides controlled rotation for clean cuts |
| Hole saw bit (bimetal or carbide-tipped) | Cuts precise circular holes |
| Center punch or nail | Marks the drilling point to prevent slipping |
| Masking tape | Protects the surface and reduces vibration |
| Lubricant (cutting oil or machine oil) | Keeps the drill bit cool and prevents friction burns |
| Safety goggles and gloves | Protects your hands and eyes from metal debris |
| Fine sandpaper or deburring tool | Smooths sharp edges after drilling |
Tip: For most faucet or soap dispenser installations, the hole size is 1⅜ inches (35 mm) — but always confirm your product’s specifications.
Identify where you need the hole — typically on the sink deck or counter flange behind the basin.
Check underneath to ensure no braces, supports, or pipes are in the way.
Apply a small square of masking tape to the area where you’ll drill.
Use a marker to mark the hole’s center on the tape.
The tape prevents the drill bit from wandering and protects the sink’s finish.
Place a center punch on your mark.
Tap it lightly with a hammer to make a small indentation.
This helps guide the drill bit and keeps it stable.
Use a ⅛-inch (3 mm) drill bit to make a small pilot hole at the center mark.
Keep the drill speed low to medium (around 500–800 RPM).
Apply steady, moderate pressure — don’t force the drill.
Purpose: The pilot hole acts as a guide for the larger hole saw and reduces wandering or vibration.
Attach the correct-size bimetal hole saw to your drill.
Apply a few drops of cutting oil or machine oil to the drill area to reduce friction.
Start drilling at low speed to allow the saw teeth to bite into the metal gradually.
Once the groove forms, you can slightly increase speed — but avoid overheating.
Periodically stop to add more lubricant and prevent burning or discoloration.
Important:
Keep the drill perpendicular to the surface.
Use light, controlled pressure — excessive force can dent thin sink steel.
Shunhan sinks are made from 1.2–1.5 mm thick stainless steel; precise drilling ensures clean edges without bending the surface.
When the saw breaks through, reduce pressure immediately.
Stop the drill and remove the cut-out disc carefully.
The metal will be hot — handle with pliers or let it cool first.
Use fine-grit sandpaper or a deburring tool to smooth the inner edge of the hole.
This prevents injuries and ensures proper sealing when installing the faucet or accessory.
Wipe away all metal shavings and residue using a damp cloth.
Apply a few drops of oil or stainless steel polish to restore the finish.
| Tip | Explanation |
|---|---|
| Work slowly | Overheating damages drill bits and the sink’s finish. |
| Lubricate frequently | Reduces friction and extends bit life. |
| Avoid high drill speeds | Can cause discoloration or jagged cuts. |
| Clamp the sink (if removable) | Prevents vibration and ensures precision. |
| Use new, sharp tools | Dull bits can skid or cause dents. |
Always use protective gloves and goggles — small metal shards can be sharp and hot.
| Mistake | Consequence |
|---|---|
| Using a standard wood bit | Dulls immediately and scratches the surface |
| Drilling without lubricant | Causes heat discoloration and rough edges |
| Applying too much pressure | Can warp or dent thin sink steel |
| Skipping the pilot hole | Increases vibration and bit slippage |
| Using chlorine cleaners after drilling | May trigger surface corrosion |
