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    System of Measurement
    System of Measurement
    Metric
    Inch
    Thread Size
    Thread Size
    7/8"-18
    Thread Pitch
    Thread Pitch
    click to learn more about
    Thread Type
    Thread Type
    Spark Plug
    Metric
    UNS
    Thread Direction
    Thread Direction
    click to learn more about
    Chamfer Type
    Chamfer Type
    Bottoming
    Plug
    Taper
    Flute Type
    Flute Type
    Straight
    Spiral
    Point
    Number of Flutes
    Number of Flutes
    3
    4
    6
    Overall Length
    Overall Length
    2 9/16"
    3 19/32"
    4.03"
    4 1/32"
    4 11/16"
    Maximum Tapping Depth
    Maximum Tapping Depth
    3/4"
    1.09"
    1 3/32"
    1 21/32"
    1 13/16"
    2 7/32"
    Thread Length
    Thread Length
    5/8"
    1.09"
    1 3/32"
    1 21/32"
    1 13/16"
    2 7/32"
    DFARS (Defense Acquisition Regulations Supplement)
    DFARS (Defense Acquisition
    Regulations Supplement)
    Number of Tapping Ends
    Number of Tapping Ends
    1
    2
    Drill Bit Decimal Size Equivalent
    Drill Bit Decimal
    Size Equivalent
    0.5039"
    0.6496"
    0.7874"
    0.8281"
    Pitch Diameter Limit
    Pitch Diameter Limit
    default
    D4
    H3
    D6
    Drill Bit Size
    Drill Bit Size
    53/64"
    12.8 mm
    16.5 mm
    20 mm
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