Set of 4 Genuine NGK 7401 UR4IX Iridium IX Spark Plugs

Shell
-Thread Diameter: 14mm
-Thread Pitch: 1.25mm
-Seat Type: Tapered
-Reach: 11.6mm (.460")
-Hex Size: 5/8" (16mm)
-Terminal Type: Solid
-Overall Height: ISO
-Gap: .039" (1.0mm)

Center Electrode
-Material: Iridium
-Type: Fine Wire
-Size: 0.6mm
-Projection: Projected

Ground Electrode
-Material: Nickel
-Type: Standard
-Shape: Taper Cut

Specifications
-Resistor: Yes
-Resistor Value: 5k Ohm
-Heat Range: 4
-Features: 3.0mm Extended Metal Shell
-Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 7.2-14.5 lb. ft.