How to Use a Spade Bit for Clean Holes in Wood
By Quality Industrial Abrasives and Tools | Benchmark Abrasives | Published: 2026-10-28
Category: How-to Guides
Learn how to drill clean, splinter-free holes in wood with a spade bit. This guide covers speed, backing board, and bit prep for precise results.
Quick Answer
For clean holes with a spade bit, use a high drill speed, clamp a scrap wood backing board behind your workpiece, and start with the bit's center point before feeding it through.
Why Spade Bits Can Tear Wood
Spade bits (also called paddle bits) have a flat cutting edge that can splinter the exit side of the hole if you drill straight through without support. The high-speed steel edge cuts aggressively, which is great for speed but can leave rough edges on softer woods.
When a Clean Finish Matters Most
If you're drilling for visible joinery, wire routing, or exposed fastener holes, even small tear-out can ruin the look. Using a backing board and controlling the exit speed prevents this. For rough framing or hidden work, you can skip these steps and drill faster.
Step-by-Step: Drilling Clean Holes with a Spade Bit
- Mark and Clamp Your Workpiece: Mark the hole center clearly. Clamp the workpiece securely to your workbench. Place a scrap wood backing board directly behind the exit point. A common mistake is skipping the backing board—this causes splintering on the back side.
- Set Drill Speed and Position the Bit: Set your drill to a high speed setting (spade bits cut best at 1000-3000 RPM). Position the bit's center point exactly on your mark. Start the drill before contacting the wood. Starting the drill before touching wood prevents the bit from walking off the mark.
- Drill with Controlled Pressure: Push the bit straight into the wood using steady, moderate pressure. As the bit breaks through the back side, reduce pressure and let the bit cut slowly through the backing board. If you push hard at the end, the bit will grab and tear the exit hole. Let the bit do the work.
- Clear Chips and Inspect the Hole: Withdraw the bit while the drill is still running to clear chips from the flutes. Blow out dust from the hole. Check both sides for splinters. If you see rough edges, sand them lightly with fine-grit paper. For future holes, increase the backing board thickness.
Recommended Product
- 1-1/2" x 6" Spade Bit: Benchmark Abrasives 1-1/2" x 6" spade bits are made from heat-treated high-speed steel, precision ground from a solid piece for accurate holes. The solid construction and sharp center point help the bit self-center and stay on track, reducing wandering and tear-out during drilling.
1-1/2" x 6" Spade Bit
