NGK standard plugs are constructed for longer life and optimum performance.

• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• 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
• • Thread Diameter:  14mm
  • Thread Pitch:  1.25mm
  • Seat Type:  Gasket
  • Reach:  12.7mm (1/2")
  • Hex Size:  13/16" (21mm)
  • Terminal Type:  Removable Nut
  • Overall Height:  ISO
  • Gap:  .039" (1.0mm)
  • Center Electrode
  • Material:  Nickel
  • Type:  Standard
  • Size:  2.5mm
  • Projection:  Non-Projected
  • Ground Electrode
  • Material:  Nickel
  • Type:  Standard
  • Quantity:  1
  • Specifications
  • Resistor:  Yes
  • Resistor Value:  5k Ohm
  • Heat Range:  9
  • Torque Specs:  Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.