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NGK 7397
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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

Center Electrode Core MaterialCopper Core
Center Electrode Tip MaterialIridium
Gap Size0.04 in
Ground Electrode Quantity1
Hex Size5/8"
Insulator HeightISO
Manufacturer Heat Range5
Additional Info5K Ohm
Seat TypeTapered
Reach17.5mm
Thread Diameter14 MM
Ground Electrode Tip DesignTaper Cut
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel Core
Alternate/OEM Part Number(s): 5273, 7549, BPR5EFVX, TR5IX

NGK Warranty Information
Spark Plug Wires: Limited Lifetime; All Other Parts: 60 Days