How do you remove a stripped or broken screw? Screw extractors, forward or reverse, sizing the extractor, what to do when the extractor itself breaks, the rubber band trick, penetrating oil, and the other tools that pull a seized screw
A screw extractor is a hardened, tapered, left-hand-threaded bit: you drill a pilot hole in the screw head, set the extractor in it, and turn it counterclockwise (reverse); the left-hand flutes bite harder as the screw resists and back it out. Size the extractor by the screw: the extractor packaging lists the screw range and the pilot drill for each number, and the pilot must be drilled dead center and no larger than listed. The rubber band trick (a wide band between a Phillips driver and a stripped head) works on a lightly stripped screw that is not seized. A broken extractor is harder steel than the screw and the usual way out is a carbide burr or a solid carbide bit to grind it away, or heat and a left-hand drill bit.
C&R SSC-682 Screw RemoverThe product data lists the SSC-682 as a retail-carded screw removerThe order of operations. A stripped screw is one whose recess has rounded so the driver spins; a seized screw is one whose threads have rusted or galled so it will not turn; a broken screw has lost its head. The fixes go from gentle to destructive: more grip on what is left (rubber band, a larger or different driver, pliers on the head), then penetrating oil and heat, then an extractor, then drilling the screw out and re-tapping or using a larger screw. The cards below answer each question people ask at each step, including what to do when the extractor breaks in the hole, which is the one question nobody wants to need.
Stripped and broken screws, question by question
Extractor sizes and pilot drills are the ones the extractor manufacturers print on their sets; the rest is shop practice.
Stripped screws in plain words
- Stripped means the recess is rounded; seized means the threads are stuck; broken means the head is gone. Each has its own fix.
- Extractors turn counterclockwise, slowly, with downward pressure. Never with an impact driver.
- Size the extractor from the chart on the set; drill the pilot dead center and no larger than listed.
- The rubber band trick works on a lightly stripped screw in wood or plastic, not on a seized one.
- Penetrating oil and heat first, extractor second, drill out third.
- A broken extractor comes out with a punch, a carbide burr or a solid carbide bit; nothing in a normal set drills it.
- A left-hand drill bit run in reverse is the next closest thing to an extractor.
- Bolt extractors go over a rounded head; screw extractors go inside.
Questions people ask
How do you extract a broken screw extractor?
Shatter it with a sharp punch, grind it out with a carbide burr or solid carbide bit at low speed, or send the part for EDM; then drill out the screw and re-tap.
Can the rubber band trick be used to remove a stripped screw?
On a screw that is stripped but not seized, in wood or plastic, with firm pressure, yes.
How to make a homemade screw extractor?
A left-hand drill bit run in reverse, a hacksaw slot for a flat driver, or a nut welded to a broken stud; a real extractor costs a few dollars.
Do you use a screw extractor in forward or reverse?
Reverse; the left-hand flutes bite as they turn the screw out.
What is the tool to remove a stripped screw?
A screw remover bit set, damaged-screw pliers on a proud head, a manual impact driver, or a bolt extractor socket over a rounded hex.
Will WD-40 loosen a stripped screw?
It helps a seized screw if given time; a thin penetrating oil works faster. Neither fixes a rounded recess.
Do screw extractors really work?
On stripped screws with a centered pilot, turned slowly, usually; on rust-seized steel, oil and heat first or the extractor breaks.
What size screw extractor?
From the set’s chart: #1 for #4 to #8 screws, #2 for #8 to #12, #3 for 1/4 to 5/16, #4 to 7/16, #5 to 5/8, each with its listed pilot drill.
How effective are screw extractors?
Very, within their job: stripped heads and lightly seized screws. They are brittle and fail when spun fast or in an off-center hole.
Is there a difference between a screw extractor and a bolt extractor?
Yes: a screw extractor goes inside a pilot hole; a bolt extractor is a fluted socket that goes over a rounded head.
What is the smallest size screw extractor available?
#1 in standard sets, for #4 screws; micro sets go smaller for electronics.
How do you know what size screw extractor to use?
Match the screw diameter to the range printed on the extractor and drill the pilot size it lists.
What is a screw extractor bit?
A double-ended bit with a left-hand burnishing drill on one end and the tapered extractor on the other, for use in a drill at low speed.
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