SummerCool 20" Lawn Mower Blade AC04020 Replace for Ryobi 20 Inch Mowers Parts,Compatible with Ryobi RY40180, RY40190, RY401110, RY401120 Mowers,Mulching Blade 20 Inch,Black

What It Is

This is an aftermarket 20-inch mulching blade designed to replace the OEM blade on select Ryobi 20-inch cordless mowers. It’s meant for cutting grass and leaving finely chopped clippings on the lawn rather than bagging.

Fitment & Compatibility

Before buying, confirm your mower has a 20-inch cutting deck only. This blade is compatible with Ryobi models RY40180, RY40190, RY401110, and RY401120. It is an aftermarket replacement, not OEM, so the hole pattern, center hole diameter, and blade thickness should match the original—but measure your existing blade’s center hole and overall length to verify. The blade is 20 inches long, so it will not fit 21-inch or 18-inch decks.

Key Things to Know

• Installation is straightforward if you have a socket wrench and a block of wood to lock the blade. No special tools required.
• Check the blade’s balance after installation. Some users report slight vibration if the blade isn’t perfectly balanced.
• Mulching performance is good for regular grass but may struggle with thick, wet, or tall grass. Consider bagging or side-discharge for heavy cuts.
• Price vs. OEM: At $28.99, it’s usually cheaper than a factory Ryobi blade, but check if your mower is still under warranty—using aftermarket parts can void it.

Should You Buy It

If you own one of the listed Ryobi 20-inch mowers and need a budget-friendly mulching blade for routine lawn care, this is a solid choice. Skip it if you need a bagging or high-lift blade, or if your mower is still under warranty and you want to avoid any risk of voiding it.