NGK 3691 TR8IX Iridium IX Spark Plug

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

Shell

Thread Diameter:14mm
Thread Pitch: 1.25mm
Seat Type: Tapered
Reach: 18mm (.709")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .039" (1.0mm)

Center Electrode

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

Ground Electrode

Material: Nickel
Type: Standard
Shape: Taper Cut

Specifications

Resistor: Yes
Resistor Value: 5k Ohm
Heat Range: 8
Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 7.2-14.5 lb. ft.

• Mfg Part No: 3691 TR8IX
• Related Part No: 3691 TR8IX