Set of 4 NGK 7397 Iridium IX Performance Spark Plugs TR5IX

Electrode Material: Iridium
Thread Size: 0.551"
Thread Reach: 0.708"
Ground Electrode Quantity: 1
Gap: 0.040"
Spark Plug Seat Style: Tapered
Heat Range: 5
Longevity: 40-50k Miles
Shape: Taper Cut
Thread Diameter: 14 mm
Overall Height: ISO
Resistance: 5 kOhm
Insulator Height: 53 mm
Center Electrode Core Material: Copper Core
Ground Configuration: Standard
Ground Electrode Core Material: Nickel Core
Ground Electrode Tip Design: Taper Cut
Insulator Type: Projected
Nominal Gap: 0.040"

Designed for outstanding acceleration, high fuel efficiency, and durability
Ensure a consistently stable spark
Extremely high melting point, perfect for today’s high-tech, high-performance engines
Extremely resistant to heat, corrosion and electrical wear
Match OE fit and quality
0.6 mm laser welded iridium tip
Tapered ground electrode
Manufactured using triple-gasket sealing process to prevent leakage through the shell
Alumina silicate insulator for strength and optimal heat transfer
Cold-rolled threads for easier removal and installation
Corrugated ribs eliminate misfire causing “flashover”
Trivalent metal plating
Last 40 to 50 thousand miles