NGK 90156 ITR6G9 Laser Iridium Spark Plug, 14mm Tapered Seat, Heat Range 6

The NGK 90156 (ITR6G9) Laser Iridium spark plug is an OE-quality iridium spark plug for ignition systems that call for a fine-wire iridium plug. It has a laser-welded iridium center electrode and a copper core. The design aims for dependable starts, stable spark and long service life. NGK is a major original equipment supplier of spark plugs in North America.

Key Features:

• Iridium alloy center electrode: The fine-wire tip has a very high melting point and is much denser than platinum. This helps it deliver a consistent spark and resist wear.
• Copper core: The core helps draw heat away from the tip and improves conductivity.
• Tapered seat design: The 14mm thread has a 1.25mm pitch. The tapered seat seals without a gasket.
• Resistor type: The built-in resistor helps suppress radio-frequency interference.
• Pre-gapped: The gap is 0.035 in. (0.9mm).
• Ceramic insulator: High-grade alumina ceramic resists dielectric punch-through and helps manage heat.
• Trivalent metal plating: The plating resists corrosion and seizing, which makes the plug easier to install and remove.
• 5/8 in. (16mm) hex and a solid terminal.
• NGK heat range 6.

Specifications:

• NGK part number: 90156 (stock number); manufacturer part number: ITR6G9
• Thread diameter: 14mm
• Thread pitch: 1.25mm
• Seat type: Tapered
• Hex size: 5/8 in. (16mm)
• Center electrode tip: Iridium
• Center electrode core: Copper
• Gap: 0.035 in. (0.9mm)
• Heat range: 6
• UPC: 087295901564

Cross-references: Motorcraft SP536, Ford CGSF12YP, Ford DR3V-12405-BA, DENSO 4512, 4714, IT20TT and PT20TT.

This plug can serve as an OE replacement or as a performance-minded upgrade. NGK builds it to original-equipment standards for engines that need a long-life iridium plug.