Denso W16EXR-U Spark Plug

This Denso W16EXR-U is a standard spark plug that fits thousands of makes and models of vehicles. Its U-groove tip allows the spark to fill the shape of the groove for a larger, hotter flash front to eliminate excessive fouling and erratic starts caused by poor fuel mixtures. The plug's five rib design prevents flashover and reduces voltage loss, and the insulator is made of highly purified alumina powder for strength and thermal conductivity at high temperatures. A mixture of copper and glass powder bonds the center electrode and insulator together for a gas-tight seal, and the electrode has a copper core for maximum thermal conductivity and increased operating range. Specifications Diameter 0.55" (14mm) Reach 3/4" (19mm) Hex size 13/16" (20.8mm) Seal type gasket Resistor yes Terminal type M4 thread Electrode material Copper core Projection type projection Tip configuration Single electrode DENSO manufactures products for automotive powertrain control, electronic, thermal, and safety systems as well as small motors and components. The company, founded in 1949 in Japan, meets International Organization for Standardization (ISO) standard 9000 and is QS9000 certified.