Shell Thread Diameter: 14mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 26.5mm (1.04") Hex Size: 5/8" (16mm) Terminal Type: Cup Gap: .031" (0.8mm) Center Electrode Material: Platinum Type: Fine Wire Size: 1.0mm Projection: Projected Ground Electrode Material: Platinum Type: Standard Quantity: 1 box Specifications Resistor: Yes Resistor Value: 1K Ohm Heat Range: 7 Torque Specs Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.