NGK.com specializes in hard to find NGK products. We are not NGK Spark Plugs USA. To contact them, click here.

NGK 5139 JR8C Multi-Ground Spark Plug

SKU #JR8C
ITEM #NGK5139
BRAND NGK

30 in stock

Order by 1pm PST M-F for same day shipping

$6.44 USD

Delayed Shipping

The quantity you are purchasing

This updated lead time is based on the quantity you have selected.

  • Description
    Multi-ground electrodes improve ignition capabilities and are less sensitive to increased voltage requirements due to gap growth. Designed to specific manufacturer ignition requirements, NGK's multi-ground plugs maintain all the features of their standard plugs, including:
    • Corrugated Ribs to Prevent Flashover
    • Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer
    • Copper core to aid in heat removal
    • Triple seals to prevent leakage
  • Product Specifications
    • Shell
    • Thread Diameter12mm
    • Thread Pitch1.25mm
    • Seat TypeGasket
    • Reach19mm (3/4")
    • Hex Size18mm
    • Terminal TypeThreaded Stud
    • Overall HeightISO
    • Gap.028" (0.7mm)
    • Center Electrode
    • MaterialNickel
    • TypeStandard
    • Size2.5mm
    • ProjectionProjected
    • Ground Electrode
    • MaterialNickel
    • TypeMulti-Ground
    • Quantity2
    • Specifications
    • ResistorYes
    • Resistor Value5k Ohm
    • Heat Range8
    • Torque SpecsCast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.
    • Part Information
    • BrandNGK/NTK
    • Warranty60 Days
    • Longevity50k Miles
  • Fitment

    Verify Fitment

    Automotive

    Sorry, no automotive applications are associated with this part.

    Powersports

    Sorry, no powersports applications are associated with this part.

    Non-Automotive

    Sorry, no non-automotive applications are associated with this part.