Mower Blades Fit for RYOBI 20-inch Deck Lawn Mower, Replacement Blade Compatible with RY40180, RY40190, RY401110/RY401011, RY401120, RY40LM30,Replaces AC04020,2 Pack

What It Is

This is a 2-pack of replacement mower blades designed for RYOBI 20-inch deck electric lawn mowers. They are for cutting grass and mulching, specifically for cordless models with a 20-inch cutting width.

Fitment & Compatibility

Before buying, verify your mower deck size is exactly 20 inches (measuring blade tip to tip). These blades fit RYOBI models: RY40180, RY40190, RY401110/RY401011, RY401120, and RY40LM30. They replace OEM part AC04020. The blades have a center hole diameter of 1-inch and a total length of 20 inches. They are aftermarket, not genuine RYOBI, so check that your mower uses a single bolt center mount (most RYOBI 20V 20-inch models do). If your mower has a different mounting system (e.g., two-bolt or star pattern), these will not fit.

Key Things to Know

• Quality vs. OEM: These are aftermarket blades. At 4.1 stars from only 9 reviews, performance feedback is limited. They may be slightly thinner or less balanced than genuine RYOBI blades, which can affect cut quality and vibration.
• Installation: Easy—you need a socket wrench (usually 15mm or 5/8 inch). Remove the single center bolt, replace the blade, and torque to 30-40 ft-lbs. Always disconnect the battery first.
• Sharpening: They are not self-sharpening. After 10-15 hours of use, you may need to sharpen or replace them. Dull blades tear grass, leading to brown tips.
• Common Gotcha: Ensure you install the blade with the cutting edge facing upward (toward the deck). The curved side should point up for proper lift and mulching.

Should You Buy It

Buy these if you need a quick, affordable replacement for a RYOBI 20-inch mower and don’t want to pay for OEM blades (which cost about $10-15 more per pair). They work fine for average residential lawns. Skip them if you have a larger yard, thick or wet grass, or want maximum cut quality and durability—genuine RYOBI blades are a safer bet.