NGK Iridium Plug (LTR7IX-11)

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NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Fine wire center electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high-tech, high performance engines.


    • Trivalent metal plating 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
    • Triple seals prevent leakage



  • Thread Diameter 14mm
  • Thread Pitch 1.25mm
  • Seat Type Tapered
  • Reach 25mm (1")
  • Hex Size 5/8" (16mm)
  • Terminal Type Solid
  • Overall Height ISO
  • Gap .043" (1.1mm)


Center Electrode

  • Material Iridium
  • Type Fine Wire
  • Size 0.6mm
  • Projection Projected


Ground Electrode

  • Material Nickel
  • Type Standard
  • Shape Taper Cut



  • Resistor Yes
  • Resistor Value 5k Ohm
  • Heat Range 7
  • Torque Specs Cast Iron: 10.8-18 lb. ft. Aluminum: 7.2-14.5 lb. ft.
  • Longevity 50k Miles
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