How to remove a rusted screw

Updated 15 November 2026 · 5 min read

Rust swells as it forms, and it locks a screw's thread in place like glue. Near the coast, on fences, trailers, boats and old cars, it's the most common reason a screw won't budge. The trick is to break the rust's grip before you put real force on the head, or you'll strip it as well.

1. Clean out the head

Scrub the head with a wire brush, and pick the rust and dirt out of the recess with a small pick or an old screwdriver. A bit that only sits halfway into a rust-filled head is how a seized screw becomes a stripped one.

2. Soak it in penetrating oil

Spray a penetrating oil around the head and wherever the thread goes in, and give it time to creep into the thread: at least 15 minutes, and overnight for bad ones, with a second soak in between. A dedicated penetrating oil usually works better than a general-purpose spray lubricant. Tap the head a few times with a hammer while you wait. The vibration helps the oil work in.

3. Shock it loose

Seat the screwdriver firmly and hit the handle end with a hammer a few times, then try to turn it. Better still, use a manual impact driver: the kind you hit with a hammer. It turns the blow into a sharp twist while driving the bit into the head, which is exactly what a seized screw needs. Mechanics have used them on rusted bike and car screws for decades.

4. Try tightening it first

It sounds backwards, but a small turn clockwise can crack the rust bond. Once it's moved a fraction either way, turn it anticlockwise to come out.

5. Heat it (metal only)

Heat expands the metal around the screw and cracks the rust. Use a heat gun or a small blowtorch on the metal around the screw for 30 seconds to a minute, then try again while it's warm. Some people put a little candle wax on the hot thread as it cools; it gets drawn in and helps it turn.

6. If the head rounds off, use an extractor

Rust softens screw heads, and they often strip on the first hard turn. That's when a screw extractor earns its keep. The burr end of a double-ended bit cuts through rust and scale to clean metal, and the left-hand thread grips the screw from the inside, so the state of the head doesn't matter. Keep the oil and heat going: an extractor works best on a screw that's already been loosened up. Step-by-step instructions are in how to use a screw extractor.

7. If it snaps

Badly rusted screws sometimes shear off rather than turn. Don't panic: there's usually still a way out. See how to remove a broken screw.

Stop it rusting in next time

• Use stainless steel or hot-dip galvanised screws outdoors, and stainless near the coast. Plain zinc-plated screws are for indoors.
• Match the screw to the job: treated pine and some hardwoods corrode ordinary screws faster.
• Put a little anti-seize compound on screws and bolts going into metal, especially stainless into aluminium on boats and trailers.

Written by Backout.

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