Sparking plug

The utility model belongs to the sparking plug field especially discloses a sparking plug, the utility model provides a simple structure, design scientific and reasonable, long service life, the resistance to corrosion is strong, the high sparking plug who does not have the fracture risk of ignition excellent performance and metal casing intensity, including the insulator, the metal casing, center electrode, lateral electrode and ground connection screw rod, the cladding of metal casing is provided with the retaining thread in the outside of insulator portion and the outside of metal casing, the ground connection screw rod is fixed to be set up in the insulator lower part, the insulator middle part is provided with six angle spiral portions, lateral electrode one end is fixed to be set up on the metal casing, the other end is free end and the top of free end setting at center electrode, form the clearance between free end and the center electrode, center electrode sets up in insulator axle center department, center electrode's upper end extends to the insulator outside, its lower extreme with the ground connection screw rod is connected, center electrode includes the cylindrical electrode base member, the cladding has the inoxidizing coating on the outside circumference of electrode matrix.