Steps to Find the Correct Replacement Lawn Mower Blade
To find the proper replacement mower blade you need to:
- Identify the OEM (original) mower blade Part # supplied with your mower.
- Use Instant Parts Finder on the MowMore.com website to find the replacement blade cross reference Part #.
Find the OEM part #’s suitable for your mower using one of the following steps:
- Reference the owner’s manual provided with your lawn mower.
- Refer to OEM website, search Parts/blades to find the Part #’s for your mower.
- You will need the lawn mower Model #, Serial #, and Deck Size to search for a mower Part # on a OEM or dealer website.
- Keep in mind that mowers support multiple blade types – low-lift, high-lift, mulching, etc. See Blade Type FAQ for more info.
- Identify the Part # stamped on the blade you are using.
- If the stamped part # is not visible, a wire brush may do the trick.
- This Part # is usually found between the center holes.
- This stamped # may be an OEM # or an aftermarket blade #. Often blades have 2 lines of numbers – one being a Part #, the other being a manufacturing batch #.
- Call a Dealer for your equipment with your Model #, Serial #, and Deck Size and request the Part # for the part you are looking for.
- Be sure to ask for the OEM #.
If a dealer has their own system of #s, it probably will not provide a cross reference.
Once you have the OEM Part # for the Blade Type you are looking for simply type the Part # into the MowMore Instant Parts Finder on the MowMore home page to find your replacement blade.
Your last resort would be to measure your current lawn mower blade as described in the MowMore FAQ "How to Measure a Lawn Mower Blade".
How to Measure a Lawn Mower Blade?
The best way to find a replacement blade is by looking up the OEM# (original part # for the blade) from the owners’ manual. The next best would be to find the number stamped into the blade you are using now, usually somewhere between the outside holes or near the center hole. This number can be used to find an OEM replacement blade or cross reference high-quality aftermarket blades at a reduced cost.
If the stamped part number is not visible, a wire brush or emery cloth may do the trick. If the number is still not visible or the blade is discontinued, you can easily find a replacement by measuring the mower blade length, width, outer hole diameters, and center hole configuration.
How to measure a lawn mower blade?
What measurements are needed to find a replacement lawn mower blade.
- Length is always measured diagonally from one tip to the opposing tip. Measuring end to end will result in the wrong blade length and the wrong replacement mower blade.
- Width is measured at the widest part of the blade from edge to edge. The most common widths are 2”, 2 ¼”, 2 ½ “, 2 ¾ “, and 3” although others are available.
- Outer holes are always round and measured by diameter. Use a drill bit to easily determine the diameter. If the blade has side holes the replacement must also have side holes in order to secure the blade properly.
- Center holes are measured by diameter and shape. The most prevalent center hole is round and measured by diameter. A rectangular hole is measured by length and width. All others simply match the shape. Star center holes will fit on a specific matching spindle. Blades with a Bow Tie of H pattern will fit a 5-point, 6-point or triangular spindle.
What are the different types of lawn mower blade center holes?
The most prevalent lawn mower blade center hole is a round center hole. Other types of center hole configurations include the bow tie center hole, the 5-point, 6-point, and 7-point center holes, and the rectangular center hole.
The round center hole size is based on diameter. The rectangular center hole is measured by length and width. All others simply match the shape.
Star center holes are not measured by size. They will fit on a specific matching spindle. Blades with a Bow Tie of H pattern will also not have a measurement. They will fit a 5-point, 6-point or triangular spindle.
Side holes are always round and measured by diameter. If your blade has side holes the replacement blade must also have side holes in order to secure the blade properly.
The roles of different types of Lawn Mower Blades.
- Low-Lift Blades - Use a Low-Lift Blade when the conditions are dry, or when performing seasonal scalping. Lift created by the cutter blades will be reduced. The Low-Lift Blade will also help reduce cutter deck blowout during the conditions stated above.
- High-Lift Blades – Use a high-lift blade for weedy/wet conditions. The high-lift blade purposefully expels grass clippings out of the mower into a bagging device or out the open discharge chute. The high blade angle generates more air circulation, which helps prevent clippings from sticking underneath the deck - especially when damp.
- Sand Blade - Use a Sand Blade in sandy soil areas, when the conditions are dry, or when performing seasonal scalping. Lift created by the cutter blades will be reduced, decreasing the abrasion wear to the cutter blades and deck caused by sand.
- Standard-Lift Blade - Use a Standard Blade for the best overall cutting performance in most conditions. The Standard Blade will create optimum lift that is required during normal cutting conditions resulting in a clean, even appearance.
- Mulching Blade - Mulching blades are designed for use with a mulching (discharge block-off) plate or with a complete mulching system, such as the Hurricane Plus Mulch System. These blades feature a high lift, “double-cut” edge for quick, thorough shredding of grass clippings and debris.
How to select the right trimmer line?
There are several things to understand when selecting the right trimmer line for use on your trimmers. Primarily size, shape, material, and style. The selection of the right line is primarily dependent on the job you are doing and the capability of your trimmer.
Trimmer Line Sizes?
In general, the tougher the cutting job is the thicker the trimmer line needs to be. Thicker trimmer line is more durable and will last longer and is less likely to break or wear out.
The downside is the impact on your trimmer. Thicker line has more wind resistance requiring more power to rotate the trimmer head. If the line is too thick for the power of the trimmer it will not work effectively and wear out early.
See the owner’s manual for maximum line size.
The purpose of different Trimmer Line Shapes?
The trimmer line shape will also affect cutting performance and trimmer efficiency. Selecting the right trimmer line for the job will save time and money.
Round Trimmer Line – this basic standard shape is used in most trimmers for light work on residential lawns with light weeds. It’s the least expensive and is easy to replace. This line rips the grass rather than cutting it, but the round shape does not wear down as quickly and is more durable around concrete, asphalt, trees, and roots.
Edged Trimmer Line – trimmer line with sharp edges such as square, star or pentagon is best for commercial jobs with heavier weeds and larger lawns.
Unlike round trimmer line, the sharp edges cut through grass and weeds quickly and give a clean cut. More efficient cutting is also faster and puts less strain on the trimmer.
The downside is this line tends to break more easily when it contacts concrete, stone, etc. so landscapers should keep plenty on hand.
Twisted Trimmer Line – twisted trimmer line is for heavy duty use on yards with heavy thick weeds. The twisted shape provides some edge for a cleaner cut than round line. This line is also very durable around concrete, stone or other hard surfaces, is more efficient than round line, and reduces trimmer vibration and noise.
What is typical Trimmer Line Material?
Trimmer line is usually made of nylon material. Commercial grade trimmer line is usually reinforced composite nylon which adds extra strength, durability and resists breakage. Heavy duty trimmer line is usually nylon composite reinforced with aluminum or other polymers.
Cost, durability, and efficiency should be the considerations for commercial landscapers.