Iridium Power 0.4mm Iridium Spark Plug

It features a 0.4mm iridium alloy center electrode, laser-welded for durability and reduced voltage requirements, ensuring a more consistent and powerful spark. The plug incorporates a U-Groove ground electrode with a tapered cut, which further enhances ignitability and minimizes quenching, leading to a more complete combustion. The center electrode is projected for improved performance. Constructed with a purified alumina powder insulator, this spark plug offers exceptional strength and superior thermal conductivity, preventing flashover with its five-rib design. Machine rolled threads are incorporated to prevent seizing or cross-threading during installation and removal, ensuring a smooth service experience. Each Denso Iridium Power spark plug is 100% pre-fired to guarantee the highest quality output. The copper-glass seal provides a gas-tight bond between the center electrode and the insulator. With a longevity of 30,000 miles and a 12-month warranty, these spark plugs are built for sustained performance.