lineThickness : Number

Sets the thickness of the custom break lines in pixels.

Default: 1
Example: 1,4,6 
var  chart =  new  CanvasJS.Chart("chartContainer",
{
 .
 .
 axisY: {
	scaleBreaks: {
		customBreaks: [{
			lineThickness: 6,
			.
			.
		}]
	}
 },
 .
 . 
});
chart.render();
Try Editing The Code

  Also See:    

If you have any questions, please feel free to ask in our forums.Ask Question