NGK Spark Plugs NGK: Laser Iridium Plug 5599

NGK ITR4A15 Spark Plug

NGK Laser Iridium spark plugs offer the best combination of performance and longevity. The iridium tipped center electrode provides durability six times harder than platinum. NGK's high-grade pure alumina ceramic and 98% pure copper core prevents the spark plug from overheating while providing reliable starts.

Laser iridium plugs are tested to the highest standards to ensure quality and durability. Actual OE or equivalent replacement spark plug.

Part Number: ITR4A15

Stock Number: 5599

Resistance (Ohm): 5000

Ground configuration: Standard

Ground electrode core material: Nickel

Center electrode core material: Copper

Center electrode tip material: Iridium

Replaces Mercury 33-8M2018369, 33-884019001, 338M0204739

Frequently Asked Questions

• What is the NGK ITR4A15 Spark Plug used for? The NGK ITR4A15 Spark Plug is an OE or equivalent replacement spark plug featuring a laser iridium center electrode tip. It is designed to provide durability and reliable starting performance, with an iridium-tipped center electrode and NGK high-grade pure alumina ceramic construction.
• What type of electrode does the NGK ITR4A15 Spark Plug have? The NGK ITR4A15 uses an iridium center electrode tip with a copper center electrode core. Its ground electrode has a standard configuration and uses nickel as the ground electrode core material.
• What are the specifications of the NGK ITR4A15 Spark Plug? The NGK ITR4A15 has a resistance of 5000 Ohms, a standard ground configuration, a nickel ground electrode core, a copper center electrode core, and an iridium center electrode tip. Its NGK stock number is 5599, and its part number is ITR4A15.
• What are the benefits of the iridium center electrode on the NGK ITR4A15? The iridium-tipped center electrode is designed for durability, with NGK stating that iridium is six times harder than platinum. The Laser Iridium design is also tested to high standards for quality and durability.
• Which Mercury spark plugs does the NGK ITR4A15 replace? The NGK ITR4A15 Spark Plug replaces Mercury part numbers 33-8M2018369, 33-884019001, and 338M0204739. These replacement numbers can be used to help verify that the ITR4A15 matches the spark plug specified for your application.