535080001 Blade Mounting Assembly Compatible with Ryobi 20" Brushless Lawn Mower, fits for RY40108 RY40109 RY401010VNM RY401013 RY401013VNM Models

What It Is

The 535080001 Blade Mounting Assembly is a replacement part for Ryobi 20-inch brushless walk-behind mowers. It secures the blade to the spindle and includes the bolt, washer, and mounting plate needed for safe blade installation.

Fitment & Compatibility

This assembly is designed exclusively for Ryobi 20-inch brushless mower models: RY40108, RY40109, RY401010VNM, RY401013, and RY401013VNM. Before buying, confirm your mower’s deck size is exactly 20 inches and that it uses a brushless motor—this part will not fit gas or older brushed-electric models. Measure the existing blade bolt diameter (typically 5/16-inch) and check that your spindle matches the mounting plate’s center hole pattern. This is an aftermarket part, not OEM Ryobi, so verify that your original part number is 535080001 or equivalent.

Key Things to Know

• Installation difficulty: Easy—requires only a socket wrench and blade removal tool. Torque the bolt to 30-40 ft-lbs; over-tightening can strip the spindle.
• Quality note: Aftermarket, but matches OEM specs. Inspect the bolt threads and washer for burrs before installation.
• Common gotcha: The mounting plate may have a slight offset—ensure it aligns with your blade’s center hole to avoid vibration.
• Safety: Always disconnect the battery or spark plug before working near the blade. Replace the entire assembly if the original bolt is damaged or rusted.

Should You Buy It

If you need a direct-fit, low-cost replacement for the blade mounting hardware on your Ryobi 20-inch brushless mower, this is a solid choice. It’s ideal for DIY owners who want to avoid buying a full OEM kit. Skip it if you prefer genuine Ryobi parts or if your mower uses a different bolt size or deck width.