Genuine NGK 3133 Nickel Spark Plug BPZ8HS-10 Johnson Mariner Mercury Evinrude

Shell
Thread Diameter: 14mm
Thread Pitch: 1.25mm
Seat Type: Gasket
Reach: 12.7mm (1/2")
Hex Size: 13/16" (21mm)
Terminal Type: Solid
Overall Height: JIS
Gap: .039" (1.0mm)

Center Electrode
Material: Nickel
Type: Standard
Size: 2.5mm
Projection: Projected

Ground Electrode
Material: Nickel
Type: Standard

Specifications
Resistor: Yes
Resistor Type: Inductive
Resistor Value: 35 Ohms
Heat Range: 8
Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.