DPTOOL 14mm Back Tap Spark Plug Thread Repair Tool M14x1.25, 5.27 in Length

Overview

The DPTOOL 14mm Back Tap is a purpose built tool designed to repair severely cross damaged spark plug hole threads in M14x1.25 cylinders. It enables thread restoration without removing the cylinder head or installing a coil insert, offering a practical option for field repairs and professional shop work alike.

Designed to focus on the thread and bore, this tool can help reestablish a clean, usable path for future maintenance. A straight, controlled cutting action helps rethread the hole with precision, preserving the overall integrity of the bore while minimizing downtime.

Key benefits you may notice

• Repair capability for cross damaged threads while keeping the bore clean and intact.
• Grease on the threaded portion traps metal shavings and allows removal with the tool, reducing debris in the cylinder.
• Made from high quality 42CrMo steel, offering strong, tough performance with good wear resistance and fatigue endurance.

Why choose DPTOOL 14mm Back Tap

This tool is built to withstand repeated use in automotive environments. The material is described as equivalent to 4140 steel, combining high strength with reliable toughness, even in challenging temperatures. The hardened and tempered design helps maintain dimensional stability during threading work, supporting precise outcomes without obvious brittleness.

What you get and how to use

The tool is 5.27 inches long, designed to work with M14x1.25 spark plug threads. It is intended to repair threads and create a secure path for rethreading, while avoiding the need for cylinder head removal or coil inserts. A structured approach to use helps manage resistance and reduce the chance of snagging.

• Insert the tap straight through the hole, then expand the thread path and back-thread 3 to 5 times.
• When turning becomes tougher, back off and resume in a controlled manner, turning slowly and evenly to reestablish the cut.
• If you encounter a hard patch, back up slightly, then proceed forward again while keeping a steady pace.
• Old shavings and debris can be removed along with the tool; follow with a final bore inspection.

Specifications and warranty

• Thread: M14x1.25
• Length: 5.27 inches
• Material: 42CrMo steel

DPTOOL offers a 12 month warranty. If any quality issue arises, you may be eligible for a refund or replacement according to the policy.