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NGK Ruthenium HX is designed for newer engines which demand high ignitability. Double Fine Electrode (DFE) 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.


Thread Diameter 12mm

Thread Pitch 1.25mm

Seat Type Gasket

Reach 26.5mm (1.04")

Hex Size 9/16" (14mm)

Terminal Type Solid

Gap .043" (1.1mm)

Center Electrode Material Ruthenium

Type Fine Wire

Size 0.6mm

Projection Projected

Ground Electrode Material Platinum

Type Fine Wire

Quantity 1



Resistor Yes

Resistor Value 5k

Ohm Heat Range 7

Features Special Gasket


Torque Specs

Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.


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