Glow Plug Thread Repair Tool M12 x 1.25 140mm Rethreader

A glow plug thread repair tool used for cleaning up and re-cutting damaged M12 x 1.25 glow plug threads. Built for engine repair work, it gives you a practical way to restore worn or contaminated threads without turning a smaller fault into a much bigger job.

Used in garages, workshops and vehicle maintenance, this type of rethread tool is helpful when glow plug threads need tidying before refitting. The 140mm length gives better access where the thread sits deeper in the cylinder head, which is useful during servicing and repair work on engines with awkward access. It suits mechanics, trade users and experienced DIYers carrying out thread repair as part of regular engine maintenance.

The tool is sized specifically for M12 x 1.25 threads and includes an eccentric function to make handling easier in tighter working areas. A centre shaft helps guide positioning during use, while the conical mounting shaft is provided for thread repair sleeves. An external hex drive allows the tool to be turned with the correct spanner or socket, and the knurled knob gives extra grip when starting the tool by hand or lining it up carefully. For regular workshop use, these details help make thread repair more controlled and straightforward, especially when access is limited and accuracy matters.

Glow plug thread repair tool specifications

• Thread size: M12 x 1.25 for glow plug thread cleaning and re-cutting.
• Reach: 140mm length helps access deeper seated threads in the head.
• Function: Eccentric design helps with handling in awkward positions.
• Guidance: Includes centre shaft for more accurate positioning during use.
• Drive and grip: External hex drive and knurled knob for turning and control.

A practical choice for regular engine maintenance and repair work.