“M” SERIES COIL ADAPTERS
FOR 3/4″-20 SHIELDED SPARK PLUGS

Available in a variety of configurations
to meet every application.

  • Available in a variety of lengths (see chart below).
  • Available with standard or long length male terminal.
    • Specify standard male terminal when connecting to 3/4″-20 spark plugs with standard terminal wells; such as, BG RB118SD, RBH485SD, or Champion RHM77N, RHM83N, RHM85G.
    • Specify long male terminal when connecting to 3/4″ -20 spark plugs with extended terminal wells; such as Champion RHW77N or RHW80N.
  • Available with either Teflon® or ceramic insulator. Specify ceramic where temperatures exceed 500°F.
  • Rugged stainless steel construction for maximum durability. Spare parts kit available to change insulator assembly when required.
  • Most models CSA approved for Class 1, Group D, Division 2 hazardous locations.
  • Proper installation torque: 10-25 ft.-lb.
Coil Adapter with long male terminal for use with 3/4″-20 spark plugs having extended terminal wells; such as Champion RHW77N shown below.
Coil Adapter with standard male terminal for use with 3/4″-20 spark plugs with standing depth terminal wells shown below.
Coil Adapter ModelLength*Spark Plug TerminalInsulatorSpare Parts Kit No.
M8-1C0.75LongCeramicRM8-1C
M8-1T0.75LongTeflon®RM8-1T
M8-2C0.75StandardCeramicRM8-2C
M8-2T0.75StandardTeflon®RM8-2T
M15-2C1.5StandardCeramicRM15-2C
M28-1C2.75LongCeramicRM28-1C
M28-1T2.75LongTeflon®RM28-1T
M28-2C2.75StandardCeramicRM28-2C
M28-2T2.75StandardTeflon®RM28-2T
M68-1C6.32LongCeramicRM68-1C
M68-1T6.32LongTeflon®RM68-1T
M68-2C6.32StandardCeramicRM68-2C
M68-2T6.32StandardTeflon®RM68-2T
M80-1C8LongCeramicRM80-1C
M90-2C9StandardCeramicRM90-2C
M108-1C10.75LongCeramicRM108-1C
M108-2C10.75StandardCeramicRM108-2C
M188-1C18.75LongCeramicRM188-1C
M188-2C18.75StandardCeramicRM188-2C
M240-2C24StandardCeramicRM240-2C
*Length shown is length added to installed height of spark plug (in inches)

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