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Assess the break before drilling
A snapped screw is often removable without enlarging the hole, but the right method depends on how much of the screw remains exposed, its diameter, and what the workpiece is made of. Start by unclamping or supporting the workpiece so it cannot shift. Remove nearby dust and finish carefully; a slipping drill bit can scar wood, strip a hole in plastic, or skate across metal.
Check whether the screw is steel, stainless steel, brass, or another material if you know. Hardened screws are tougher to drill than mild steel, and stainless steel can work-harden if a bit rubs without cutting. Also consider whether the screw is holding a loaded part. Relieve that load before attempting removal. If the broken fastener is in a structural connection or a costly part, stop if your first controlled attempt starts wandering.
Choose a method for the amount exposed
| What remains | First method to try | Main risk |
|---|---|---|
| About 3 mm or more above the surface | Grip the shank with locking pliers and turn counterclockwise | Crushing the shank or scratching the surface |
| Flush with the surface | Center-punch, then use a small left-hand drill bit | Drilling off-center into the workpiece |
| Below the surface | Center accurately; drill a pilot hole and use a suitable extractor | Breaking the extractor, which is very hard to drill out |
| Small screw in delicate material | Use a fine bit and work slowly, or seek machine-shop help | Making the hole too large to repair |
For an exposed stub, clamp the pliers tightly and turn steadily. Rocking the screw back and forth can help break corrosion, but avoid bending it sideways. Put a thin scrap shield around the screw if the finish matters.
Set up the drill to stay centered
For a flush or recessed screw, make a small dimple at the center with a sharp center punch. On a soft surface, use light taps; a hard blow can deform thin sheet metal or split a board. If the screw is small, a drill guide or a rigid jig helps keep the bit square. A hand drill is usually easier to control than an impact driver here. Impact blows can snap small bits and give you less control over pressure.
Choose a sharp bit made for the fastener material, such as a cobalt bit for many steel screws. A left-hand drill bit set is useful because it cuts while turning counterclockwise; sometimes the screw backs out before you need an extractor. Match the pilot bit to the extractor instructions rather than guessing. Extractor sizes vary, and a hole that is too wide leaves too little screw wall to grip.
Use a cordless drill on its lowest speed setting, with the clutch or torque control set low enough to limit a sudden grab. Keep the drill perpendicular to the work. For many metal screws, a few drops of cutting oil reduce heat and bit wear; do not use oil on wood or materials where it could stain or interfere with finishing. Clear chips often, and let the bit cut rather than leaning hard on it. If the bit squeals, heats rapidly, or makes dust instead of chips, stop and check sharpness, speed, and alignment.
Use an extractor only after a clean pilot hole
Drill a centered pilot hole to the depth specified for the extractor. Keep it shallow enough that you do not drill through the workpiece or hit something behind it. Then insert the extractor and turn it counterclockwise by hand with a tap wrench or small adjustable wrench. Apply even pressure. A power drill can twist off a tapered extractor, especially in a small screw or a fastener seized by rust.
Do not keep increasing force if the extractor does not move the screw. Extractors are hard and brittle; a broken one can be harder to remove than the original screw. Back out, apply penetrating oil if appropriate, allow time for it to work, and try again with careful hand pressure. Heat can help on some metal assemblies, but it can damage paint, plastic, wood, seals, or nearby wiring. Do not use a torch around flammable material.
A basic screw extractor set with left-hand bits is reasonable for occasional household repairs. Check that its smallest sizes fit the screws you actually use. Very cheap sets may have inconsistent cutters, but buying a large professional kit is unnecessary if you only remove a few small fasteners a year.
Protect the hole and know when to stop
The most common failure is an off-center hole. It cuts into the surrounding material, weakens the original threads, and can leave too little room for a replacement screw. Stop if the bit starts walking, the pilot hole is visibly off-center, or the fastener is not turning under moderate hand pressure. For a valuable aluminum part, thin sheet, or a small screw in a hard-to-reach location, a repair shop may cost less than repairing a damaged hole.
Once the screw is out, inspect the threads. If they are intact, use a replacement screw of the same diameter and pitch, and correct the cause of the break: excessive tightening, a binding hole, corrosion, or a screw that was too short. In wood, a stripped hole may accept a larger screw or a glued wood dowel followed by redrilling. In metal, use the correct tap to clean damaged threads; if they are gone, a thread insert or professionally sized repair may be needed.
For concrete or masonry, a snapped screw may be part of an anchor system rather than a simple threaded hole. Avoid drilling blindly into the wall: locate the anchor type and check for hidden wiring or plumbing first. If the anchor spins or the surrounding masonry begins to crumble, stop rather than enlarging the damage. Replacing the anchor in a sound location is often safer than forcing the broken fastener out.