The NGK 5899 Laser Iridium spark plug is a replacement plug. It has M14-1.25 threads, a 0.750 in. reach, a 5/8 in. (16 mm) hex and a heat range of 5. A fine wire iridium alloy center electrode built to the original equipment design delivers long service intervals in late-model engines.

NGK 5899 Laser Iridium Spark Plug Features:

• M14-1.25 metric thread with 0.750 in. reach
• 5/8 in. (16 mm) hex
• Flat seat with crush washer installed
• Heat range 5
• 0.032 in. factory pre-gap
• Iridium center electrode tip with platinum ground electrode tip
• Resistor type (5000 ohm) for ignition noise suppression
• Non-removable nut terminal
• 1.990 in. insulator height
• Fine wire iridium alloy center electrode built to the original equipment design for long service intervals
• Platinum protected ground electrode where specified for even wear in distributorless ignition systems
• Copper core center electrode draws heat away from the firing end
• Trivalent metal plating resists corrosion and thread seizing
• Intended for engines that originally used fine wire iridium plugs
• Sold individually