NGK Spark Plugs, #93961 LKAR7C9, Standard spark plugs are chosen by more automotive, motorcycle and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life. Triple gasket sealing process eliminates gas leakage past the shell. 99% Highly pure alumina silicate insulator. Solid copper core. Corrugated ribs to prevent flash over. Cold rolled threads to prevent damage to cylinder head. Trivalent plating - silver chromate and zinc for corrosion resistance. Thread Diameter 12mm Thread Pitch 1.25mm Seat Type Gasket Reach 26.5mm (1.04") Hex Size 9/16" (14mm) Terminal Type Solid Gap .035" (0.9mm) Center Electrode Material Nickel Type Standard Size2.5mm Projection Projected Ground Electrode Material Nickel Type Standard Quantity 1 Specifications Resistor Yes Resistor Value5k Ohm Heat Range 7 Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.
