Iridium Long Life Spark Plug

The DENSO ZTJ16R10 is an iridium long life spark plug engineered for optimal performance and longevity. The spark plug features a 0.7mm iridium-tipped, laser-welded fine wire center electrode, which is crucial for precise ignition and efficient combustion. This is complemented by a platinum-tipped ground electrode, further enhancing durability and performance. Constructed with a purified alumina powder insulator, the ZTJ16R10 offers exceptional strength and thermal conductivity, helping to dissipate heat effectively and prevent pre-ignition. The five-rib insulator design prevents flashover, ensuring consistent spark delivery. Machine-rolled threads are incorporated to prevent seizing or cross-threading during installation and removal, simplifying the replacement process. Each spark plug is 100% pre-fired to guarantee the highest quality and reliability right out of the box. The copper-glass seal bonds the center electrode and insulator, creating a gas-tight seal for sustained performance. Key specifications include a 14mm thread diameter, 1.25mm thread pitch, and an 18mm reach. The spark plug is designed with a tapered seat, a 5/8" (16mm) hex size, and a solid terminal type. The center electrode measures 0.55mm and is projected for optimal spark gap exposure. The ground electrode is a standard type with a single platinum tip. This spark plug is designed to be a resistor type with a value of 5k Ohm. It has a heat range of 16 and recommended torque specifications of 7-15 lb. ft. for both cast iron and aluminum engine blocks. The expected longevity of this spark plug is between 80,000 to 100,000 miles, offering extended service life.