Spark Plug Application Automotive Hex Size 5/8 in Thread Size 0.551 in Thread Reach 1.04 in Ground Electrode Quantity 1 Ground Electrode Tip Design Standard Gap Size 0.043 in Resistor Plug Yes Hex Size - Metric 15.88 mm Thread Reach - Metric 26.5 mm Insulator Material Ceramic Manufacturer Heat Range 6 Seat Type Flat Center Electrode Diameter 0.039 in Ground Electrode Material Platinum Core Center Electrode Material Platinum Compatible Engine Type H4 H6 V6 V8