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There are many different designs and sizes of lawn mower blades. Some blades are made specifically for particular lawn mowers. They have a stamped part number that is mentioned in the instruction manual.      For instance, a lift blade generates a strong suction that efficiently wills clippings upwards, so they can be sorted. The blade is also able to provide an optimal air flow even in grass to avoid the clogging.      Size      The overall length of the mower blade as well as the hole pattern must be figured out to ensure that you pick the correct replacement lawnmower blades. Also the shear pins used to locate holes and their distance to the blade boss must be established. These measurements aid in narrowing the results of your search since they correspond to the design of a specific mower blade and are suited to prevent damaging the components of the mower and creating vibrations in the mower.      Standard blades (also known as 2-in-1 blades or lift blades) are commonly used on lawnmowers equipped with side discharges and lawnmowers that do not have mulching or bagging. Their back edge has an upturn of a small amount that creates a constant cutting and suction action.      High lift blades feature an incredibly steep upturn to the back of the blade and are specifically designed to be used for side discharge mowing. This type of blade requires more engine power to function well. They can be a bit more expensive in terms of fuel, however it is great for thicker grasses which are tough to cut using standard blades.      Material      The blades of lawn mowers are generally made from an extremely durable steel. Metals like iron or other can be used. Steel is the most popular option for mower blades because it offers a great combination of strength and toughness. It is heated to harden the steel. The process of tempering increases the strength and durability of the material as well as the resistance to corrosion.      It is more beneficial to employ high carbon steel when cutting than low carbon steel because it's more durable. It is strong enough to stand up to tree stumps, rocks and other objects that could strike the blade, but not break it.      The Best blade sharpener for lawn mower way to keep a lawn mower blade is to regularly use it and maintain it at a high-quality sharpness. It is also important to balance the blade. This can be accomplished by placing a nail in the board, and using an adjustment tool to move the nail until it is in the center of the blade.      Sharpness      The sharpness of your blades will depend on several factors, including how much you are using it, as well as the dimensions of your lawn. Sharpening is needed more frequently when large lawns have lots of pebbles, trees, rocks and weeds. A dull blade will wear out faster if you use frequently.      A sharp edge for cutting is essential for a smooth and attractive cut. A sharpening tool for blades can help achieve this. It functions like a bench grinding machine, but is much smaller and less expensive.      It is essential to regularly balance the blade particularly after having it sharpened. The process of sharpening removes metal from one end of the blade faster than the other, making the blade unbalanced. Hang the blade through the hole in the bolt onto a nail to check its balance. If one of the ends tilts more than one, the blade will need to be sanded further to ensure it is balanced.      Maintenance      Use a special tool to sharpen a mower blade. It is similar to the drill, but it comes with the stone specifically designed to hold the edge, leaving no room for error. This tool is much more efficient and more precise than hand-filing. After both sides are clean, examine the balance of the blade hanging it from an anchor through the hole in the bolt. If one end drops lower than the other it needs to be filed further to ensure that it is balanced.      Before you take off a blade ensure that the engine is turned off and pull the spark plug wire to prevent the engine from accidentally beginning while working on the blade. Then, block the blade to keep it in place while loosening the bolt that fastens it using an ratchet set or wrench. When you reinstall the blade, make sure you know the direction of the blade to ensure it gets mounted in the right position. Spray a bit of WD-40 or another lubricant on the bolt that holds it in place prior to tightening it.