Description about Various Sections and Terminologies of Spark Plug
Stud
This is fixed to the insulator. The high-tension cord is also connected to this.
Corrugations
These provide protection against flash over.
Caulked Portion
The insulator and metal shell are caulked together to ensure a gas tight seal.
Metal Shell
It provides a contact for the socket wrench when screwed in.
Plate Finish
It protects against the chemical corrosion.
Gasket
It prevents leakage of the combustion gas. Sufficient tightening torque must be applied.
Sealing Power
Reinforces mechanical strength to prevent leakage under high pressure and temperature.