M12x1.25 Back-Tap Spark Plug Thread Repair Tool - Thread Chaser & Restorer for Stripped Spark Plug Holes, No Head Removal, Debris-Free Engine-Safe Design, Fits 12mm Spark Plug Threads

The tool collapses to pass through the M12x1.25 bore, expands inside to engage the last clean threads at the base, then repairs each damaged thread as it's drawn back out - carrying all metal debris with it, not into your engine.

• Back-Tap Design Repairs M12x1.25 Spark Plug Threads Without Removing The Cylinder Head - Stripped or fouled 12mm spark plug threads? This Back-Tap Spark Plug Thread Repair Tool is engineered specifically for M12×1.25 thread pitch, letting you restore damaged spark plug hole threads from inside the combustion chamber - no cylinder head removal, no heli-coil inserts, no machine shop required. Saves hours of labor and hundreds in repair costs.
• Debris Exits With The Tool - Zero Metal Shavings Left In The Cylinder - The biggest risk with conventional thread chasers is metal debris falling into the combustion chamber, causing catastrophic engine damage. Our Back-Tap Style design works in reverse: as the tool is pulled outward, it captures and carries all metal shavings and debris out of the bore with it. Apply a small amount of grease to the threading area before use to maximize debris adhesion. Your engine stays protected every time.
• Collapsible Design Enters The Bore, Expands Inside, And Repairs Threads From The Bottom Up - Standard thread taps cut from the top down, pushing metal debris deeper into the engine. This tool works differently: it collapses to fit through the M12×1.25 spark plug opening and pass into the combustion chamber. Once inside, the repair zone expands and locks onto the last intact threads at the base of the bore. As the tool is drawn back upward, it re-engages and restores each damaged thread in sequence - working from clean to stripped, inside out — in one smooth, controlled motion with no debris pushed downward.
• Extreme Hardness - Built To Rethreading Hardness Demands, Made to Last - Spark plug thread repair demands a tool harder than the aluminum cylinder head it's cutting into. This Back-Tap tool is manufactured to extreme hardness specifications specifically engineered to meet and exceed the demands of repetitive thread cutting in engine-grade aluminum. Unlike softer tools that dull after a single use, this tool maintains cutting precision across multiple repair jobs - for professional shops and serious DIYers alike.
• Skip The Traditional Thread Taps. Skip The Machine Shop. Get Back On The Road. - Traditional M12×1.25 spark plug thread repair options mean wrestling with Heli-Coil style insert kits (complex, fiddly, high debris risk) or pulling the cylinder head entirely (expensive, time-consuming). The Back-Tap Style tools eliminates both. M12×1.25 threads are common on smaller-displacement gasoline engines and many motorcycle, ATV, and powersports applications - Compatible with Yamaha, Kawasaki, Suzuki, Honda, and BMW. If your bike or small engine runs a 12mm spark plug, this is the tool for the job.
• Package Include: 1 pcs 5.27 Inch Long M12*1.25 spark plug thread repair tool.