Easy
15-30 minutes
This replacement 20 inch blade is a high quality item that is supplied from original equipment manufacturer for use with Lawn Boy and Toro lawn mowers. Mulching blades are designed to circulate the grass longer so it can be cut into smaller pieces. This makes the grass clippings better as mulch since the smaller clippings will decompose quicker, releasing their nutrients into the soil. This part is made from strong durable metal and it is sold individually.
Blade-20 Inch 133-8181-03
OEM part for: Toro, Lawn Boy
Part Number: 133-8181-03
$36.11
In Stock
Ships within 1 business day 
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Compatibility
This Blade-20 Inch will fit the following 71 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Displaying 20 of 71 matching models.
71 total model matches. Try the above search to narrow your results.
This is the official OEM part for the following brands:
- Lawn Boy
- Toro
This item works with the following types of products:
- Lawn Mower
This part replaces obsolete part #: 112-8841-03
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Easy replacement.
Blade arrived quickly and was very easy to put on. Mower cuts great now.
Guest -
June 25, 2022
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
old blade worn out and pot of balance
John - May 18, 2020
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
removed old blade an installed new blade
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Oil pan gasket was leaking and did some maintenance while it was down
Shannon - September 23, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set, Wrench Set, Nutdriver, Impact driver
1. Took the engine off the mower deck
2. Remove the blade from the engine
3.Drain the oil from engine
4.Remove the oil pan and clean old gasket off
5.Change old oil seal out of pan
6.Put new gasket on pan and resemble it
7.Reinstall engine to mower deck
8.Install new blade
9.Install new air filter
10.Install new rope
2. Remove the blade from the engine
3.Drain the oil from engine
4.Remove the oil pan and clean old gasket off
5.Change old oil seal out of pan
6.Put new gasket on pan and resemble it
7.Reinstall engine to mower deck
8.Install new blade
9.Install new air filter
10.Install new rope
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Needed a new blade
Chris - September 23, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
Removed the blade nut and the blade support, then the old blade
Installed the new blade with the support and blade nut
Installed the new blade with the support and blade nut
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Needed a new blade
Edward - April 27, 2018
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
Removed bolt,blade and replaced
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The original blade was still on the mower and had been sharpened so many times I couldn't get it balanced.
Allen - July 12, 2017
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
Parts Used
Ereplacement identified the blade I needed so I could replace it.
Removed the blade bolt and the blade support, then removed the old blade.
Installed the new blade on the spindle, then the blade support, then tightened the blade bolt.
Removed the blade bolt and the blade support, then removed the old blade.
Installed the new blade on the spindle, then the blade support, then tightened the blade bolt.
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Cable brake and bai brake broke
Shawn - May 20, 2017
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Socket set
Put a piece of wood to stop the blade from moving and used a socket to get the bolt off.
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Blade needed to be replaced
Robert - June 23, 2016
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Adjustable Wrench
The blade support was bent a little so I replaced that too.
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Lawn mower clutch cable broke and blade was dull.
Brian - June 28, 2016
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Pliers, Socket set
1. For the blade, use socket set to remove nut, replace blade and replace net.
2. For cable, remove nut near handle.
3. Undo cable and remove.
4. Place new cable on and bolt down.
2. For cable, remove nut near handle.
3. Undo cable and remove.
4. Place new cable on and bolt down.
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Replaced worn lawn mower blade and grass catcher bag.
Tom - May 9, 2016
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Removed the spark plug wire, then wedged a piece of wood so the blade cold not move. Removed the blade bolt and the blade support, then the old blade. Placed the new blade on the shaft then placed the blade support on the blade and screwed in the blade bolt. Then installed the grass bag on the bag frame. Then replaced the spark plug wire on the spark plug.
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NEEDED NEW BLADE
RON - May 13, 2020
👍 0 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
REPLACED OLD BLADE
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
