Blade Mounting Assembly RY401011 535080001 Compatible with Ryobi 20 inch Brushless 40v Lawn Mower, Fits Ry401011, Ry401012, Ry401011Vmn, Ry401012Vmn, RY40108, RY40109 Model
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🛒 See Price on AmazonWhat It Is
This is the blade mounting assembly (part numbers RY401011 and 535080001) for Ryobi 20-inch brushless 40v mowers. It includes the blade bolt, washer, and adapter plate needed to secure the blade to the motor shaft—essential for any blade replacement on these models.
Fitment & Compatibility
Check your model number first. This assembly fits Ryobi models: RY401011, RY401012, RY401011Vmn, RY401012Vmn, RY40108, and RY40109. All require a 20-inch deck and the 40v brushless motor system. Do not assume it fits other Ryobi mowers—older 40v or 18v models use different hardware. Measure your existing blade bolt diameter (typically 5/16-inch) and adapter plate thickness (approx. 0.25 inch) to confirm. OEM Ryobi part number is 535080001; aftermarket versions should match this exactly.
Key Things to Know
- Quality: Most aftermarket assemblies are zinc-plated steel and hold up well. OEM parts are slightly more durable but cost 2–3x more. Check reviews for reports of stripped threads or soft metal.
- Installation difficulty: Easy—requires a wrench or socket (usually 7/16-inch or 1/2-inch) and a torque wrench (recommended 30–40 ft-lbs). No special tools needed.
- Common gotcha: The adapter plate must sit flush on the motor shaft. If it’s warped or misaligned, the blade will wobble and cause vibration or poor cut. Always hand-tighten before final torquing.
- Tip: Replace the blade bolt every 2–3 blade changes to prevent thread wear. Use thread locker (blue Loctite) on the bolt to avoid loosening during operation.
Should You Buy It
If you own one of the listed Ryobi 20-inch 40v mowers and need to replace a damaged or worn blade mounting assembly, this is a cost-effective, direct-fit option. It’s ideal for DIY maintenance—just verify your model number and bolt size. For heavy commercial use or if you want OEM reliability, consider the genuine Ryobi part instead.
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