Easy
15-30 minutes
The cupped washer attaches to the tri-arc blade with the use of the lock nut. This part is an OEM from Ryobi and Homelite to be used in brushcutters and trimmers. It is made of metal and helps to keep the cutting tool in place. A wrench will be needed if this part needs to be replaced. This washer is priced as an individual replacement part.
Cupped Washer 04409
OEM part for: Ryobi
Part Number: 04409
$4.99
In Stock
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Compatibility
This Cupped Washer will fit the following 149 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
This item works with the following types of products:
- Trimmer Parts
This part replaces obsolete part #: UP04129, 638017001
Customer Part Reviews ?
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washer and hex nut
The hex nut was not useable (wrong size, too small).
Guest -
September 12, 2019
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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.
the nut striped
Charles - November 6, 2022
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Nutdriver
removed the old parts
replace the gear box with the new unit
installed the new cutting blade
replace the gear box with the new unit
installed the new cutting blade
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Lock nut was stripped.
John - July 14, 2020
Tool Type
Edger
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Socket set
Parts Used
Used a dremel tool to cut the damaged lock nut off.
Then I replaced the edger blade.
Then I replaced the edger blade.
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Blade struck hidden wire and came off including washers and nut.
Michael - April 10, 2018
Tool Type
Trimmer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Socket set
Simply installed parts ordered as per manual including the new blade.
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Added brush cutter to weed eater
JAMES - August 22, 2017
Tool Type
Trimmer
Difficulty
Easy
Time
15-30 minutes
Tools Used
Wrench Set
Disassembled string head and assembled cutter
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OEM stands for Original Equipment Manufacturer and means the part you’re buying is sourced directly from the manufacturer who made your product. At eReplacementParts, we sell only genuine OEM parts, guaranteeing the part you’re purchasing is of better design and of higher quality than aftermarket parts.
Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
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.
