Product details:

Spark Plug Code: RC12YCCopper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance, and longevity of the spark plug. Patented SAC-9 semi-conductor resistor for maximum EMI and RFI suppression. Patented Ultraseal coated shell for rust prevention. Plug Type: RC12YC. Seat Type: Gasket. Hex Size (Inch): 0.625. Hex Size (MM): 15.88. Thread Size (Inch): 0.551. Thread Size (MM): 14. Thread Reach (Inch): 0.75. Taper Diameter (Inch): 0.25. Installed Height: 1.99. Insulator Projection (Inch): 0.06. Gap (Inch): 0.032-0.038. Gap (MM): 0.81-0.97. Center Electrode Diameter (Inch): 0.1. Center Electrode Material: Nickel Copper Alloy. Ground Electrode Material: Nickel Copper Alloy. Classification: Champion Copper Plus. Resistor Plug: Y