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What the hole needs to do
A concealed European-style cabinet hinge sits in a circular recess called a cup hole. The recess has a flat bottom, a specific diameter, and a controlled depth; the hinge cup drops into it while the hinge arm and mounting plate provide the adjustment. A typical cup is 35 mm across, but check the hinge’s instructions before drilling. Some compact hinges use a smaller cup.
The hard part isn’t making a round hole. It’s stopping at the right depth without breaking through the door face, wandering off center, or tearing out the finish. A drill press makes depth and alignment easier, but a cordless drill can do the job with a sharp Forstner bit and a simple depth stop.
Choose the right bit
For a flat-bottom cup hole, use a Forstner bit in the diameter specified by the hinge maker. Its rim scores the circle and its cutters remove waste from the bottom, leaving a cleaner, flatter recess than a standard twist drill. A spade bit can be cheaper, but its spur and cutting edges are less forgiving; it’s more likely to leave a rough bottom or wander in a workpiece.
A hinge-boring bit is another option. It is designed for cup holes and often includes a center point and cutting geometry suited to the job. If you’ll install several hinges, a dedicated bit or a jig can make repeatable positioning easier. For a one-off repair, a correctly sized Forstner bit is usually enough.
Check the bit shank and your drill’s chuck capacity before buying. A large Forstner bit can demand more torque than a small cordless drill delivers, especially in hardwood. A variable-speed drill with a firm side handle is easier to control than an impact driver. Don’t use an impact driver for this operation: its hammering action isn’t appropriate for a clean, controlled bore.
| Tool | Best for | Trade-off |
|---|---|---|
| Forstner bit | One-off cup holes and clean flat bottoms | Needs a steady drill and careful depth control |
| Hinge-boring bit | Repeated hinge installations | Less versatile than a general-purpose bit |
| Hinge jig with matching bit | Consistent cup position across multiple doors | Costs more, but reduces layout and alignment errors |
| Spade bit | Low-cost rough work where the bottom needn’t be precise | More likely to tear out or leave an uneven recess |
Check door thickness and layout
Before drilling, measure the door thickness and read the hinge’s cup-depth and edge-offset specifications. Many common cabinet doors are about 18–20 mm thick, and many hinges call for a cup hole around 12–13 mm deep, but those are not universal dimensions. The remaining material beneath the hole matters: drilling too deep can leave a thin skin that cracks or breaks through.
Mark the cup center using the hinge maker’s specified setback from the door edge. Don’t assume every hinge uses the same offset. A drilling jig helps keep the bit square and the cup consistently positioned. If you’re using a template, confirm that it is intended for the exact hinge and cup diameter.
Clamp the door flat to a stable bench, with scrap wood beneath it if possible. Keep clamps clear of the bit and drill body. A board that shifts during drilling can ruin the hole and cause the bit to grab. If the door has a finished face, put that face upward and let the bit start slowly so its rim scores the surface cleanly.
Set a depth stop
Use the drill’s depth rod if it can be set accurately, or fit a stop collar to the bit. Another simple method is to wrap tape around the bit at the target depth, measuring from the tips of the cutting edges. Tape is only a visual warning, not a hard stop; it’s easy to drill past it. For an expensive door or a thin panel, use a collar, drill-press stop, or jig with a positive depth limit.
Check the measurement twice against the hinge cup. The cutting tips may project farther than the flat-bottom area, so don’t judge depth by the bit’s body alone. If uncertain, set the stop slightly shallow, bore the hole, test-fit the hinge, and deepen it in small increments.
Bore the hole
Set the drill to low gear and a moderate speed. Hold it square to the door, start the bit gently, and let the rim establish the circle before applying steady pressure. Don’t force a large bit through dense wood; excessive pressure can stall the drill, overheat the bit, or make it bite suddenly. Back the bit out occasionally to clear chips, especially in hardwood or a deep recess. Keep the drill aligned while withdrawing it.
Stop when the depth limit reaches the surface. Remove the chips and test-fit the hinge cup. It should sit flush or at the specified depth without rocking. If the bottom is uneven, clear loose fibers and correct it carefully; don’t enlarge the cup hole to compensate for a depth problem. If the hole is off-center or too wide, the hinge may not cover the damage, and filling it may not provide a reliable repair.
What to buy for the job
For one or two holes, a sharp bit in the right size is usually the economical choice. A drill press is not essential if you can clamp the door and keep the drill vertical. A jig becomes worthwhile when several doors need matching holes or when repeatability matters more than minimizing setup cost.
Compare a 35 mm Forstner bit with a 35 mm concealed-hinge boring jig. Confirm the hinge’s stated cup diameter, depth, and edge setback before ordering; “35 mm” alone doesn’t guarantee that a jig suits every hinge. If you already own a stable variable-speed drill, you may not need to buy another tool. A sharp, correctly sized bit and a reliable way to limit depth matter more.
Common mistakes to avoid
Don’t drill freehand without checking the door’s thickness and the hinge instructions. Don’t use a twist bit or impact driver simply because it is already on hand. Don’t hold the door by hand, and don’t push hard when the bit starts to slow. Finally, drill a test hole in scrap of similar thickness and material if you’re unsure about the setup. That small check can reveal a depth-stop error before it becomes a hole through the cabinet door.