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Iridium IX
Designed specifically for the performance enthusiast. Iridium IX® offers extreme ignitability, improved throttle response and superior anti fouling
  • Fine Iridium tip ensures high durability and a consistently stable spark
  • Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines
  • Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties
  • Tapered ground electrode minimizes quenching
  • Outstanding acceleration, high fuel efficiency and durability
  • Ultimate design, technology and performance.

Spark Plug Type Performance Differences



Correct Way to Check, Set, and Adjust Your Spark Plug Gap

Seat TypeTapered
Reach25mm
Thread Diameter14 MM
Ground Electrode Tip DesignTaper Cut
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel Core
Center Electrode Core MaterialCopper Core
Center Electrode Tip MaterialIridium
Gap Size0.044 in
Ground Electrode Quantity1
Hex Size5/8"
Insulator HeightISO
Manufacturer Heat Range6
Additional Info5K Ohm
Alternate/OEM Part Number(s): LTR6IX11

NGK Warranty Information:
Spark Plug Wires: Limited Lifetime; Ignition Coils: 3 Years / 36,000 Miles; All Other Parts: 60 Days