Glow Plug Thread Repair Kit M12 x 1.25 Tap & Coil Inserts

A glow plug thread repair kit for restoring damaged M12 x 1.25 glow plug threads in diesel engines. Used where threads have been compromised by cross-threading or over-tightening, it gives you the threaded tap, assembly tool and coil inserts needed to repair the original fixing point and get the glow plug seating correctly again.

Commonly used during engine repairs, servicing and workshop maintenance, this kit suits garages, mechanics and experienced users dealing with damaged threads in alloy cylinder heads. When a glow plug will not tighten properly or the original thread can no longer be trusted, having the right thread insert kit helps avoid turning a smaller repair into a more involved cylinder head job. It is especially useful on diesel engine work where stripped or worn glow plug threads can stop reassembly from going smoothly.

This thread repair insert kit is sized for M12 x 1.25 glow plug applications and includes a threaded tap, assembly tool and coil inserts to carry out the repair. A choice of insert depths is included, which is useful when thread damage or fitting depth varies between jobs. The inserts have a black phosphate finish, and the range of depths helps cover common repair situations without needing separate insert packs. Kept in the workshop for repeat engine work, it is a practical option for regular maintenance and thread repair tasks.

Glow plug thread repair kit specifications

• Thread size: M12 x 1.25 for glow plug thread repair work.
• Contents: Includes a threaded tap, assembly tool and coil inserts for restoring damaged threads.
• Insert depths: Supplied with 5 x 12mm deep inserts.
• Covers: Supplied with 5 x 19mm deep inserts.
• Finish: Supplied with 5 x 26mm deep inserts, with black phosphate finish on the inserts.

A useful kit to keep close to hand for diesel engine thread repairs.