NGK 91784 LKAR8BHX Ruthenium HX Plug (Box of 4)

NGK Ruthenium HX is designed for newer engines which demand high ignitability. Projected Square Platinum Electrode (PSPE) design promotes spark energy concentration and ignites a wider range of air-fuel ratios, offering improved performance in rich or lean engine conditions. 0.4mm Ruthenium alloy fine wire center electrode and 0.8mm platinum fine wire ground electrode. Trivalent metal platinum provides superior anti-corrosion and anti-seizing properties. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator provides superior strength and better heat transfer. Copper core aids in heat removal.   Shell Thread Diameter12mm Thread Pitch1.25mm Seat TypeGasket Reach26.5mm (1.04") Hex Size9/16" (14mm) Terminal TypeSolid Gap.031" (0.8mm) Center Electrode MaterialRuthenium TypeFine Wire Size0.6mm ProjectionExtended Projection Ground Electrode MaterialPlatinum TypeProjected Square Quantity1 Specifications ResistorYes Resistor Value5k Ohm Heat Range8 Torque SpecsCast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft. Part Information BrandNGK/NTK Warranty1 Year Longevity60-120k Miles