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        Cross Reference information is provided as a guide only. Please refer to the "Applications" lookup tabs for more detail. Materials and designs will differ among brands, so plugs are not exactly alike. Always check with your OE service manual for proper installation and settings.

        Iridium Racing® Insulator Height and Configuration

        Identifying Iridium Racing Plug Numbers

        I

        W

        0

        1

        27

        Classification
        Thread Size
        Serial Number
        Electrode Configuration
        Heating Ranges
        I: Iridium
        R: Surface Gap
        U: 10mm
        XU: 12mm
        A: 14mm
        AE: 14mm
        K: 14mm
        KH: 14mm
        Q: 14mm
        RE: 14mm
        RL: 14mm
        RT: 14mm
        W: 14mm
        WM: 14mm
        1: Diagonal ground electrode
        2: Horizontal ground electrode
        6: Diagonal ground electrode, non-resistor plug
        24
        27
        29
        31
        32
        34
        35

        Iridium Racing Plug Table

        Model (Heating Value)

        Thread Diameter (mm)

        Thread Length (mm)

        HEX (in)

        Plug Height (mm)

        Gasket

        Terminal/ Resistor

        Plug Profile

        Center Electrode Material

        Ground Electrode Material

        Available Heat Ranges

        IU01*
        10
        19
        5/8
        50
        Yes
        Removable /Yes
        1 A
        IR
        PT
        24, 27, 31, 34
        RU01*
        10
        19
        5/8
        50
        Yes
        Removable/Yes
        1 C
        NI
        NI
        27, 31, 34
        IXU01*
        12
        19
        5/8
        51
        Yes
        Removable/Yes
        2 A
        IR
        PT
        24, 27, 31, 34
        IA01*
        14
        22
        5/8
        27.6
        No
        Solid/Yes
        3 A
        IR
        PT
        31, 32, 34
        IAE01*
        14
        19
        5/8
        27.6
        Yes
        Solid/Yes
        4 A
        IR
        PT
        32, 34
        IK01*
        14
        19
        5/8
        50.5
        Yes
        Solid/Yes
        5 A
        IR
        PT
        24, 27, 31, 34
        IK02*
        14
        19
        5/8
        50.5
        Yes
        Solid/Yes
        5 B
        IR
        PT
        24, 27, 31
        IKH01*
        14
        26.5
        5/8
        50.5
        Yes
        Solid/Yes
        6 A
        IR
        PT
        24, 27, 31
        IQ01*
        14
        19
        5/8
        53
        Yes
        Solid/Yes
        7 A
        IR
        PT
        24, 27, 31, 34
        IQ02*
        14
        19
        5/8
        53
        Yes
        Solid/Yes
        7 B
        IR
        PT
        24, 27, 31
        IRE01*
        14
        21.5
        13/16
        66
        Yes
        Crimped/Yes
        8 B
        IR
        PT
        27, 31, 32, 34, 35
        IRL01*
        14
        21
        13/16
        62
        Yes
        Solid/Yes
        9 A
        IR
        PT
        27, 31
        IRT01*
        14
        19
        13/16
        62
        Yes
        Solid/Yes
        10 A
        IR
        PT
        31, 34
        IW01*
        14
        19
        13/16
        56
        Yes
        Crimped/Yes
        11 A
        IR
        PT
        24, 27, 29, 31, 32, 34
        IW06*
        14
        19
        13/16
        56
        Yes
        Solid/Yes
        11 A
        IR
        PT
        27, 31, 34
        IWM01*
        14
        19
        13/16
        47.3
        Yes
        Solid/Yes
        12 A
        IR
        PT
        29, 31, 32, 34