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*Designed for Turbo/Supercharged Engines

*Special Gasket


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 Diameter 14mm

Thread Pitch 1.25mm

Seat Type Gasket Reach 19mm (3/4")

Hex Size 5/8" (16mm)

Terminal Type Solid Gap .031" (0.8mm)

Center Electrode Material Ruthenium Type

Fine Wire Size 0.6mm

Projection Extended

Projection Ground Electrode Material Platinum Type

Projected Square Quantity 1



Resistor Yes

Resistor Value 5k

Ohm Heat Range 7

Features Special Gasket Torque Specs

Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.


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