Multi-ground electrodes improve ignition capabilities and are less sensitive to increased voltage requirements due to gap growth. Designed to specific manufacturer ignition requirements, NGK's multi-ground plugs maintain all the features of their standard plugs, including: Corrugated Ribs to Prevent Flashover Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer Copper core to aid in heat removal Triple seals to prevent leakage Shell Thread Diameter 14mm Thread Pitch 1.25mm Seat Type Gasket Reach 19mm (3/4") Hex Size 5/8" (16mm) Terminal Type Solid Overall Height ISO Gap .024" (0.6mm) Center Electrode Material Nickel Type Standard Size 2.5mm Projection Projected Ground Electrode Material Nickel Type Semi-Surface Discharge Specifications Resistor Yes Resistor Value 5k Ohm Heat Range 6 Features Intermittent Gap Torque Specs Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.
