When should I replace my lawn mower blade?
Also check the thickness of your lawn mower blade. Over time, dirt, sand, and other debris can erode the blade, causing the metal to weaken and become paper-thin. If you see this, you should replace the blade immediately since it can break while mowing and possibly injure someone.
How do I know what lawn mower blade I need?
The easiest way to find replacement lawn mower blades is with the OEM number. The OEM number is the numerical part number of the blade assigned by the manufacturer. In most cases, just typing this number with the manufacturer name into a search engine or online store will be enough to bring up some promising results.

Should I sharpen mower blades?
Lawnmower blades need to be sharpened regularly. A dull blade will pull and tear on your grass blades causing jagged tips. The dull blade stresses the grass and the damaged grass tips turn yellow. A sharp blade will cut cleanly which is healthier for the lawn, easier on you and your mower engine.
Should you sharpen mower blades?
What size blades are on my mower?
In most cases, the replacement blades are labeled as the same size as the deck. If, for example, the mower has a 46-inch deck, then chances are good that the correct blades are labeled “46 inch tractor blade” or similar wording.

How often should you sharpen mower blades?
twice per season
In general, sharpen twice per season or after 25 hours of use to keep your blades in good shape. Also, sharpen the blades after hitting rocks. Stone can easily dent or nick the blades. The lawn itself can also hint when you need to sharpen your mower blades.
Should I sharpen brand new mower blades?
No, it’s not necessary to sharpen brand new lawn mower blades. You can simply remove your new blade from its packaging, remove the old blade carefully from your mower, and then attach the new one.
Do all mower blades fit all mowers?
No, lawn mower blades are not universal, they are mower-specific. You can replace a certain manufacturer’s blades with another manufacturer’s blade, provided that they match up with your mower in length, thickness, width, hole numbers, hole shapes, and hole sizes.