Iridium TT Spark Plug

The Denso 4713 IT16TT is an Iridium TT spark plug, engineered to provide superior performance and an extended lifespan of over 100,000 miles. It combines advanced iridium and platinum technologies with Denso’s 360-degree laser welding process. The core of its design lies in the Twin-Tip (TT) technology, featuring the world's smallest 0.4mm iridium center electrode and a 0.7mm needle tip ground electrode made of platinum. This configuration concentrates spark energy, leading to a more efficient combustion, which translates into improved acceleration, increased power and torque, and enhanced fuel economy. The high concentration of iridium in Denso’s patented alloy ensures durability and a dramatic improvement in spark plug life. Installation is facilitated by machine-rolled threads that prevent seizing or cross-threading. Each plug is 100% pre-fired to guarantee the highest quality. The spark plug also features a purified alumina powder insulator for exceptional strength and thermal conductivity, with a five-rib design to prevent flashover. A copper-glass seal ensures a gas-tight connection between the center electrode and insulator. Product specifications include a 14mm thread diameter, 1.25mm thread pitch, and a 17.5mm reach. The hex size is 5/8" (16mm), and the terminal type is solid. The gap is set at .039" (1.0mm), and it incorporates a resistor with a value of 5k Ohm. The heat range is 16. Recommended torque specifications are 7-15 lb. ft. for both cast iron and aluminum cylinder heads.