10 M14x1.25 inserts + M16x1.25 tap, spark plug thread repair kit, professional kit for petrol and diesel engines

This spark plug thread repair kit is designed for the long-term restoration of damaged threads in internal combustion engine cylinder heads. It is intended for professional automotive mechanics, independent workshops, and experienced individuals looking to avoid the costly replacement of an engine block or cylinder head. The M14 × 1.25 inserts (14 mm diameter, 1.25 mm pitch, 17.5 mm length) ensure a robust hold thanks to their double internal/external thread design and galvanic treatment. The M16 × 1.25 tap allows for precise machining of the hole before insertion, with a smooth, low-heat cutting action. All components conform to ISO 261 tolerances and are tested for a mechanical strength exceeding 800 MPa. The kit does not require CNC equipment: it can be used with a standard torque wrench and a hand chuck. Suitable for light industrial applications, marine outboard motors and garden machinery engines.