NGK 372 Iridium IX Spark Plug ZNAR6AIX-11, 12mm Thread, Tapered Seat

The NGK 372 Iridium IX spark plug (NGK plug number ZNAR6AIX-11, also listed as stock number 0372) is a fine-wire iridium spark plug. It is a performance-grade replacement or an upgrade over standard nickel alloy plugs. NGK is a major original equipment spark plug supplier, and this plug is built for durable, stable ignition.

Key Features:

• Fine-wire iridium tip: The 0.6 mm iridium center electrode gives a consistently stable spark and long service life.
• Iridium alloy center electrode: Iridium is very dense and has an extremely high melting point, which suits modern high-efficiency engines.
• Tapered cut ground electrode: The reduced-quenching design improves ignitability, acceleration, fuel efficiency and durability.
• Solid copper core: The 98% pure copper core improves heat dissipation and conductivity and gives a wide heat range.
• Trivalent metal plating: The plating resists corrosion and seizing, so the plug installs and removes more easily.
• Resistor design: About 5,000 ohm resistance helps suppress electrical interference.

Specifications:

• NGK plug number: ZNAR6AIX-11
• Stock number: 372
• Heat range: 6
• Thread size: M12 x 1.25
• Thread reach: 1.043 in (26.5 mm)
• Hex size: 14 mm
• Seat type: Tapered (no gasket)
• Pre-set gap: 0.044 in (1.1 mm)
• Center electrode: Iridium tip with copper core
• Ground electrode: Nickel, taper cut
• Insulator height: 2.07 in (52.5 mm)
• Resistor: Yes, approx. 5,000 ohm

The plug comes pre-gapped from NGK. It suits modified and high-performance applications, and it also works as an upgrade to OE nickel alloy spark plugs.