How to Choose a Blade
How to Measure the Overall Length of Your Blade
As shown, your blade must be measured from one sharpened tip to the opposite sharpened tip. This is a diagonal measurement across the blade. (Click to enlarge the image.)
Blade Term Definitions
Center Hole Diameter
This is the distance across the hole found in the center of the blade. Some blades will have a center hole pattern as shown below (click to enlarge the image):
This is the length of the blade’s sharpened edge
This is the distance from the tip of the blade to the center of the blade mounting shaft. (See the “Common Blade Measurements” diagram above). Note: Not all blades have an offset.
The angle of the blade determines the amount of airflow and suction that is created when the blade is rotating.