How to Remove a Stripped Bolt: 7 Methods That Actually Work

Reviewed by the ScrewBoltSize Editorial Team

You're mid-repair on a washing machine, car, or lawn mower — and the bolt spins freely without gripping. Maybe the socket already rounded the hex corners, or the screwdriver cam-ed out a Phillips head. Either way, the repair is stopped until that bolt comes out.

These 7 methods are ordered from least invasive to most. Start at Method 1 and work down. The further down you go, the more tools you need — but also the more damage you can work around.

Method 1: Rubber Band Grip

Best for: Lightly stripped Phillips, Torx, or slot heads — still has some drive material left.

Place a wide rubber band (or a section of latex glove) flat over the screw or bolt head. Press your driver firmly into the rubber and turn. The rubber fills the gaps in the stripped drive geometry and adds friction. This works surprisingly often on cam-ed-out Phillips and lightly rounded hex heads.

Apply downward pressure — don't let the driver ride up. Use a hand driver rather than a powered one: too much speed overrides the grip advantage. If this doesn't work after two firm attempts, the damage is too severe and you need Method 2.

Method 2: Larger Torx or Hex Bit Hammered In

Best for: Stripped Phillips heads, worn Torx, slightly rounded hex.

Pick a Torx bit that's slightly larger than the bolt's drive recess. For a stripped Phillips, a T25 or T27 often bites. Tap the bit into the head with a hammer — just enough to seat it firmly. The corners of the Torx bit dig into the remaining metal and give you enough torque to back the bolt out.

For rounded hex heads: try the next metric size down. If the bolt is a 13mm hex but it's been rounded to 12mm shape, a 12mm socket may still grip the flat sections.

Method 3: Bolt Extractor Socket Set

Best for: Moderately to severely rounded hex heads — the workhorse method for most DIY repairs.

Bolt extractor sockets are reverse-threaded on the inside. As you apply counterclockwise torque, the spiral grooves bite harder into the bolt head. They're sold in sets covering 8mm–19mm and #8 to 1/2" range. Brands like Irwin, Topec, and THINKWORK make impact-compatible sets that hold up to 1/2" impact drivers.

Technique matters: tap the extractor socket firmly onto the bolt head with a hammer before applying torque. The tighter the bite, the better. Use a breaker bar or 1/2" impact driver — not a ratchet, which gives you less control over the initial bite.

Method 4: Penetrating Oil + Heat

Best for: Bolts that are both stripped AND rust-seized — common on cars, outdoor equipment, and appliances.

Apply PB Blaster, Kroil, or WD-40 Specialist Penetrant directly to the bolt-thread junction. Let it soak for 15–30 minutes — or overnight for severe rust.

Add heat with a propane torch: heat the surrounding metal (not the bolt itself) for 30–60 seconds. Metal expansion and contraction breaks the rust bond. After heating, hit the bolt with penetrating oil again — the thermal shock pulls it into the threads. Then try your extractor socket while the area is still warm.

Method 5: Screw Extractor Spiral Bit

Best for: Broken bolts that snapped flush or below the surface, or headless bolts.

A spiral extractor (EZ-Out) requires drilling a pilot hole into the center of the broken bolt, then driving the tapered extractor counterclockwise into the pilot hole. As torque increases, the extractor wedges tighter into the soft metal and backs the bolt out.

Drill size matters: most M6–M10 bolts use a 5/16" pilot hole; M4–M5 use 1/4". Check the extractor set's sizing chart. Keep the drill perpendicular — any angle makes it harder to drive the extractor straight.

Method 6: Left-Handed Drill Bits

Best for: Broken or headless bolts when you want to avoid full extraction drill-out.

Left-handed (reverse-helix) drill bits cut counterclockwise. When drilling into the bolt center, the bit's rotation is opposite the bolt's install direction — so friction often grabs and backs the bolt out before you've drilled through.

Set your drill to reverse. Use cutting oil or WD-40 on the bit. Start slow — you want the bit to grab and back out the bolt, not drill straight through it. If the bolt starts turning, stop drilling immediately and use pliers or a wrench to extract it the rest of the way.

Method 7: Drill Out and Re-Thread

Best for: Last resort when the bolt is completely destroyed and all other methods have failed.

Drill through the entire bolt using progressively larger bits until you're at the bolt's minor thread diameter. This removes the bolt material while leaving the female threads intact.

After drilling, use a tap to chase and clean the female threads. If the female threads are damaged too, use a Helicoil or E-Z Lok thread insert to restore the original thread spec.

Choosing Your Method: Decision Guide

Head present + lightly stripped: Start with Method 1 (rubber band), then 2 (Torx bit), then 3 (extractor socket).

Head present + rust-seized: Apply Method 4 (penetrating oil + heat) first, then proceed to 3 or 5.

Bolt snapped at surface: Method 5 (spiral extractor) or Method 6 (left-handed drill).

Bolt snapped below surface: Method 6 (left-handed drill), then Method 7 (drill out + re-thread).

All methods failed or structural bolt: Take it to a machine shop. EDM extraction can remove bolts that no hand tool can touch.

Preventing Stripped Bolts

Most stripped bolts result from three mistakes: wrong tool (wrong socket size, worn-out bits), too much speed (impact drivers cam out Phillips heads in milliseconds), and corrosion left untreated. Use quality sockets with sharp corners — cheap sets round off quickly and will eventually strip every bolt they touch.

For any bolt that's been sitting in weather for more than a season, apply penetrating oil 15 minutes before removal. A minute of prep time is worth more than an hour with an extractor kit.