NGK 4857 R7420-105 Racing Plug

NGK Racing Series plugs are engineered to withstand the harshest engine conditions. Fine wire iridium tipped center electrode and platinum tipped ground electrode improve ignitability, increase durability and enhance anti fouling capabilities. Special insulator nose configurations improve throttle response. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage.

Shell

• Thread Diameter14mm
• Thread Pitch1.25mm
• Seat TypeGasket
• Reach21mm (.827″)
• Hex Size13/16″ (21mm)
• Terminal TypeSolid
• Overall HeightISO
• Gap.028″ (0.7mm)
  

  Center Electrode

• MaterialIridium
• TypeFine Wire
• Size0.6mm
• ProjectionNon-Projected
  

  Ground Electrode

• MaterialPlatinum
• TypeSlant
• Quantity1
  

  Specifications

• ResistorYes
• Resistor Value5k Ohm
• Heat Range10.5
• Torque SpecsCast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

• Part Information
• BrandNGK/NTK