NGK 5531 DPR6EA-9 Standard Spark Plug.

NGK’s Standard Plugs are Constructed for Longer Life and Optimum Performance.

Fits Mariner, Mercury and Yamaha outboard engines.

Specifications:
Shell

Thread Size: 12mm

Thread Pitch: 1.25mm

Seat Type: Gasket

Resistor: Yes

Resistor Value: 5K Ohm

Reach: 19mm (3/4″)

Hex Size: 18mm

Terminal Type: Threaded Stud

Overall Height: ISO

Gap: .035″ (0.9mm)

Center Electrode

Material: Nickel

Type: Standard

Size: 2.5mm

Projection: Projected

Ground Electrode

Material: Nickel

Type: Standard

Quantity: 1

Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

Brand: NGK

Heat Range: 6

Longevity: 30k Miles