Are Lawn Mower Blades Universal

A lawnmower is a necessary outdoor tool for maintaining your lawn and ensuring it is perfect and well-kept. This garden tool is a significant investment, and if you properly care for it, you will be able to get the most out of it for many years.

Every person with a mower needs to understand the elements or features their lawnmower possesses to keep it in good running order. Failure to do this means you may not cut grass properly, which means your mower and mower blade can be damaged, or your lawn loses its appeal.

Two critical areas on mowers are the engine, and somewhat mower specific, there are the mower blades. You’ll find there is much more to a mower blade than you think. In our guide, you can learn more about if you can get universal lawn mower blades and what models they could fit?

mower blade

By the end, you’ll know more about all the mower blade areas and how you can deal with a damaged blade. (Learn Why Are Aluminum Lawn Chairs So Expensive)

Are Lawn Mower Blades Interchangeable?

Before asking yourself, are mower blades universal? It may not be the mower blade causing the problem.

You may have other issues if you notice your grass isn’t cutting evenly, and your riding lawn mower’s blade looks in good condition.

Cutting problems maybe be caused by grass sticking to the interior of your cutting deck as it accumulates and affects the cutting performance.

Here are a couple of ways to avoid these tell-tale signs you think maybe your mower blade.

  • When your grass is entirely dry, mow it. Any grass moisture will make it clump together.
  • To stop grass sticking, use a lubricating spray on the underside of your cutting deck and mower blade.
  • If you have tall grass, it shouldn’t be mowed. However, it’s not always that easy. Yet, the more you mow to stop grass growing, the better the results to stop grass sticking to your mulching blades and cutting deck.
  • When you’ve finished mowing, wash grass from beneath the deck and lawnmower blade once it has cooled. This prevents grass and dirt buildup after each mowing.

Lawnmower blades are mower-specific, and you don’t get universal mower blades.

You can swap out blades from one manufacturer for blades from another, as long as the length, thickness, width, hole numbers, hole shapes, and hole sizes line up with your mower.

A replacement mower blade must fit your mower perfectly and meet the manufacturer’s specifications.

Do All Mower Blades Fit All Mowers?

Not only do blades come in a variety of sizes and attach in a variety of ways, but they also come in a variety of types. (Read Dethatching St Augustine Grass)

The following compares two different mower blade designs and what they do.

Standard Blade

Lawnmower blades of this type are sometimes known as a two-in-one blade, as they cut grass and blow the grass out the side, or they fill your bag with grass clippings.

Mulching Blade

Also known as a 3 in 1 blade, the mulching blade has a broader cutting edge and is bent to mulch or finely chop the grass before discharging.

Mulching blades have the advantage of finely chopped grass settling to the ground and acting as a fertilizer as it decomposes. Such action adds valuable nutrients to the lawn and is an environmentally friendly way of dealing with cut grass.

Riding lawn mower blades are, by far, the most important equipment in the mowing process.

Your grass will cut smoothly if you use a good sharp blade. On the other hand, you’ll notice difficulties right away if your blade is dull or damaged.

Are Lawn Mower Blades The Same Size?

Different lawn mowers have different blades; there could be a difference even between the same manufacturer. For example, the number of cutting edges or the curved surface may differ considerably.

Luckily, it’s easy to identify your lawn mower blade:

user manual

1. Check User Manual

The quick way to identify a lawnmower blade is using the manual. There, you’ll find details for a replacement blade.

2. Check Make and Model

Use the mower model and make an internet search for part numbers or online to find new blades that meet the manufacturer’s specifications.

3. Check Your Current Blade Number

Check your mower blade. You’ll find this number stamped on the metal. It is blade type-specific, so you use this number, you will quickly have a new blade that is the correct blade the first time.


4. Measure Blade Dimensions

If the above doesn’t help, you’ll have to go manual and measure your old blade to find a replacement blade.

You’ll have to check in a few ways to get the length, width, and thickness.

You’ll find these dimensions vary from one manufacturer to another. So, accuracy in measuring is vital to get the correct replacement blade:

Blade Length:

Mower blades are available in various lengths, ranging from 6″ to over 32″. Begin measuring at one end and measure diagonally to the opposite corner. (Read Troy Bilt Lawn Mower Oil Guide)

Blade Width:

They are measured straight across, from one outer border to the opposing outer edge, ranging in size from 112″ to 414″. It’s in the middle of the blade, near the center hole.

Blade Thickness:

This measurement, which ranges from 1/10″ to nearly 1/3″, runs straight through the blade from one outer edge to the other. 

Center Hole

The diameter of the center bolt hole is an important measurement. The blade’s center hole isn’t simply a bolt hole; it’s also the blade’s balanced center.

Shear Pin

The distance between the center bolt hole and the shear pin locating holes on the blade boss is the shear pin hole distance.

The shear pin hole distance is the distance between the center bolt hole and the shear pin locating holes on the blade boss. These are important measurements, or the blade will not sit properly on the blade boss.

Knowing the different types of blades available might help achieve the desired results in the long term.

Identifying the various blade types will help you choose the ideal mower blade for your grass. Choosing the wrong blade might ruin your grass and damage your mower.

  • Various lawnmower blade styles and types are available that give lift and mulching choices.
  • A lawnmower blade should be able to do three things: mulch, discharge, and bag.
  • Many blades can accomplish all three jobs, while others can only perform one.
  • Typically, a lawnmower will get something that matches the center hole of the blade or configuration if there is more than one center hole. However, there are still some mowers that offer compatible blade selections.

Types of lawnmower blade function:

Low Lift Blades

Mower blades with a low lift are frequently advised for lawns with sandy soil and short, dry grasses. These blades are explicitly developed for side discharge mowing.

They have a slightly curved blade edge that controls the passage of air and low suction power and a less severe swoop to ensure that the grass stays low in the area where it is more easily expelled at the side of the mower.

Dust and debris will be kept to a minimum due to this.

Pros of low lift blades:

They have curved ends that reduce air pressure, allowing cut grasses to exit the mower while keeping dust and debris to a minimum.

Low lift blades do not stress mower engines.

High Lift Blades

Unlike their low lift cousins, high lift blades are meant for lawns with wet and long grass that demand a high horsepower motor.

The blades have deeper bends on each end, providing a solid suction to propel grass clippings into a bagger.

The high lift air beneath the mower, which has a vertical swoop shape, generates a strong suction. This improves bagging efficiency and lowers the risk of blockage.

Pros of high lift blades:

When dealing with damp or long grass, high lift blades provide more airflow and suction, preventing clogging. (Read Should I Bag My Grass Clippings If I Have Weeds)

They neatly trimmed the grass before bagging and discharging it.

Deck Blades

This is also a standard blade since it is the most popular blade type for horizontally rotating lawnmowers.

They have slightly curved edges that create a continuous airflow as they revolve, allowing them to suction and cut.

Pros of deck blades:

These blades are straight and aerodynamically designed, allowing for a powerful lift that readily discharges grass clippings from the deck. They’re also long-lasting.

Deck blades can run for longer lengths of time, which means you can get more done in less time. They’re ideal for lawns that aren’t mowed regularly.

When grass clippings aren’t an option for mulching, they’re usually the best solution.

Deck blades are simple to install and can be used with various lawnmower models.

Mulching Blade

An all-purpose blade is also known as a mulching blade. The blade is constructed with a curved surface to perform all three essential functions: mulching, discharging and bagging.

The blade begins by drawing up and cutting the grass, after which the grass clippings are sucked into the deck and subsequently chopped into smaller bits.

Finally, the blade’s innermost curve produces compressed air, expelling the little clippings. Because of this design, the grass can be chopped into smaller pieces before being bagged or introduced into the soil for mulching.

Pros of mulching blades:

Mulching blades are helpful because they can accomplish all three jobs rather than just one.

The grass clippings are kept in the deck by the curved blades, which allows them to shred the clippings into smaller pieces. In addition, the long curved surface allows you to cut more material in less time.

When mulched grasses are released into the soil, they degrade more quickly, releasing vital nutrients into the soil to aid grass growth. Mulching blades, in other words, are environmentally friendly.

Are Lawn Mower Blades Universal (2)

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