Choosing the Best Grit for Sharpening Lawn Mower Blades

Choosing the Best Grit for Sharpening Lawn Mower Blades


Welcome, lawncare enthusiasts, to another informative blog post on all things lawnmower and lawncare. Today, we’re going to tackle a topic that is often overlooked but critical for maintaining a healthy and attractive lawn – choosing the best grit for sharpening your lawnmower blades.

You see, my grass guru friends, sharp blades are essential for achieving clean and precise cuts. Dull blades, on the other hand, tear the grass instead of cleanly slicing through it, resulting in a rough and uneven lawn. So let’s dive into the world of grit and explore how it can enhance the cutting performance of your lawnmower blades.

Section 1: Understanding Grit for Sharpening Lawn Mower Blades

Grit, my fellow turf aficionados, refers to the abrasive particles that are used for sharpening and refining the cutting edge of your lawnmower blades. These particles, which are available in various materials, play a crucial role in removing metal and creating a sharp edge.

When it comes to sharpening your blades, you’ll encounter different types of grit materials commonly used, such as aluminum oxide, silicon carbide, and ceramic. Each material has its own unique properties and benefits, so let’s explore them further.

Section 2: Factors to Consider for Choosing the Right Grit

Now that you have a better understanding of the different materials used in grit, it’s time to consider various factors that will help you choose the right grit for sharpening your lawnmower blades. Factors like blade materials, current blade condition, and usage frequency are all important to consider before selecting the proper grit.

Different blade materials require specific grit requirements for optimal sharpening. For example, stainless steel blades need a more aggressive grit than softer blades made of carbon steel. It’s essential to analyze the current condition of your blades to determine the appropriate grit needed. Blades that are excessively dull and damaged may require a coarser grit initially, followed by progressively finer grits.

The frequency of mower usage and the cutting conditions should also be taken into account. If you frequently mow rough and thick grass, you’ll need a grit that can handle such conditions. Keep these factors in mind as we delve deeper into the world of grit.

Section 3: Coarse Grits for Initial Blade Sharpening

Using a coarse grit for the initial phase of blade sharpening offers several benefits, dear grass gurus. Coarse grits remove more metal, making them ideal for restoring severely dull or damaged blades. They quickly shape the blade, removing nicks and imperfections, and prepare it for the refinement stage.

For blades in rough condition, start with a coarse grit between 80 and 100. As the blade edge begins to take shape, you can switch to a medium grit between 120 and 180 to refine it further. Remember to always follow the manufacturer’s recommendations regarding grit sizes.

When using coarse grits, it’s crucial to employ proper sharpening techniques and maintain a consistent angle for sharpening the blade. This will ensure an even cutting edge and promote blade longevity. Take your time and be patient during this stage, as it sets the foundation for achieving a razor-sharp edge.

Section 4: Fine Grits for Achieving Razor-Sharp Edges

Now that your blade has undergone the initial sharpening stage with coarse grit, it’s time to transition to finer grits for achieving that razor-sharp edge. Fine grits serve to refine and polish the cutting edge, removing any remaining scratches or burrs left by the coarse grit.

Recommended fine grit sizes typically range from 220 to 600 or even higher, depending on your desired level of sharpness. The higher the grit number, the finer the particles, resulting in a smoother and more precise cutting edge.

When working with fine grits, it’s essential to maintain the same angle and sharpening technique as before. Achieving a razor-sharp edge requires patience and attention to detail, so take your time and ensure that the blade is sharpened evenly.

Section 5: Specialty Grits for Unique Blade Sharpening Needs

In addition to the common grit materials mentioned earlier, there are specialty grits suitable for specific blade types and sharpening needs. One such example is diamond-coated grit, which offers exceptional durability and cutting performance.

Diamond-coated grits are ideal for sharpening blades that require an extra level of precision, such as mulching blades and reel mower blades. The diamond particles cut more aggressively and leave a cleaner finish, resulting in enhanced cutting efficiency.

When sharpening these specialty blades, be sure to choose the appropriate diamond-coated grit size recommended by the manufacturer. Follow their instructions precisely to ensure optimum performance and longevity for your blades.

Section 6: Proper Tools and Equipment for Blade Sharpening

To achieve the best results with your blade sharpening endeavors, you’ll need the right tools and equipment. Essential items for effective blade sharpening include a bench grinder, a sharpening stone, a file, and a blade balancer.

When selecting a bench grinder, make sure it has a properly adjusted tool rest for maintaining the correct blade angle. A sharpening stone is a must-have if you prefer a more hands-on approach and want to sharpen blades manually. A file is useful for smaller touch-ups and removing burs.

Ensure that your blade balancer is in good working condition, as it helps identify imbalanced blades that can cause vibrations and uneven mowing. Safety is paramount when dealing with sharpening tools, so always wear protective gear, such as gloves and safety glasses, and follow the manufacturer’s instructions.

Section 7: Step-by-Step Guide for Sharpening Blades with Different Grits

Now that we have covered the different grit types, sharpening techniques, and safety precautions, let’s walk through a step-by-step guide for sharpening your lawnmower blades using various grits.

1. Start by removing the blade from your lawnmower and securing it in a vise or a blade holder.
2. Assess the current condition of the blade, checking for any significant damage or excessive dullness.
3. If the blade is in rough shape, begin with a coarse grit between 80 and 100. Follow the manufacturer’s instructions for using the grit properly.
4. Use long, smooth strokes while sharpening the blade, maintaining a consistent angle along the cutting edge. Ensure that you remove an equal amount of material from both sides of the blade to maintain balance.
5. Once the blade has been shaped and rough imperfections have been removed, switch to a medium grit between 120 and 180 to further refine the edge.
6. Continue using fine grits, gradually increasing the grit size for additional refinement and achieving a razor-sharp edge. Follow the recommended grit sizes based on your desired level of sharpness.
7. After each grit, check the sharpness by lightly running your finger along the cutting edge (be careful!). If it feels smooth and free of burrs, you’re on the right track.
8. Once the blade is sharpened to your satisfaction, use a blade balancer to check for balance. Make any necessary adjustments to ensure a smooth and vibration-free mowing experience.
9. Finally, reinstall the sharpened blade back onto your lawnmower, ensuring it is properly tightened and secure.

Section 8: Maintenance Tips to Prolong Blade Sharpness

Congratulations, grass gurus! Your lawnmower blades are now sharp and ready to tackle any lawn. To prolong their sharpness and maintain optimal performance, here are a few maintenance tips to keep in mind:

Regularly clean your blades after each mowing session to remove grass clippings and debris. A clean blade is less prone to rusting and clogging.

Schedule regular sharpening intervals based on your mowing frequency and the specific needs of your lawn. As a general rule, sharpening your blades at least once a season is recommended, but more frequent sharpening may be necessary for heavily used or rough-cutting conditions.

Properly store your sharpened blades in a clean and dry area. Consider using a blade cover or storage case to protect them from moisture, dust, and accidental damage.

Be on the lookout for signs of dullness, such as reduced cutting efficiency, increased vibration, or uneven grass cutting. If you notice any of these signs, it’s time to sharpen your blades.


Choosing the best grit for sharpening your lawnmower blades is a critical aspect of lawncare that should not be overlooked. By understanding the role of grit, considering various factors, and following proper sharpening techniques, you can achieve razor-sharp edges and maintain a healthy and attractive lawn.

Remember to analyze your blade materials, assess their current condition, and select the appropriate grit. Start with a coarse grit for initial sharpening, progressively move to finer grits for refinement, and consider specialty grits for unique blade types. Lastly, maintain your blades with regular cleaning, scheduled sharpening intervals, and appropriate storage.

Now, armed with this knowledge, my fellow lawncare enthusiasts, go forth and sharpen your lawnmower blades with confidence, knowing that you have the power to create a beautifully manicured lawn. Happy mowing!


Published by Marty

Hello there! I'm Marty Robbins, the man behind Growing up amidst the rolling green landscapes of Minnesota, my passion for lawns and their care took root in childhood and has only grown stronger over the years. With a blend of science and artistry, I founded as a sanctuary for both seasoned enthusiasts and green-thumbed beginners. My goal? To equip you with the knowledge and tools to craft your very own lawn oasis. Whether you're in search of expert guidance, sustainable solutions, or the latest in mower innovations, I'm here to help. Welcome to Lawnmower Heaven, and let's create some lawn magic together

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