how to hide highchart x – axis data values

In HighCharts, bar graphs use inverted axes, so the bottom axis is really the Y axis. (See also “column” graphs where the graphic is rotated 90 degrees, in which case the bottom axis is the X axis.)

You need to add the following to the yAxis config

yAxis: {
  labels: {
    enabled: false
  }
}

See the following for full example:
http://jsfiddle.net/k5yBj/433/