Compare Maximum number of 4 items selected Autolite Iridium XP Spark Plug - XP26 Part #: XP26 Line: ATO Autolite Iridium XP Spark Plug Limited Lifetime Warranty Seat: Tapered Thread Size: M14-1.25 Heat Range: 7 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.035 Inch Preset Gap (mm): 0.9mm Thread Reach (in): 0.431 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 4000 Ohm Insulator Height (mm): 62.7mm Insulator Height (in): 2.470 Inch Ground Electrode Tip Material: Platinum Thread Reach (mm): 10.95mm Metallurgy: Iridium/Platinum Show More Show Less