20 in AC04029 Lawn Mower Blade Replacement Compatible with RYOBI 40V Brushless Cordless Mowers PBLLM05, RY401170/RY401017, RY401180/RY401018, Half-Moon and Square Center Hole, 2 Pack

What It Is

This is a 20-inch replacement blade set (2-pack) designed for RYOBI 40V brushless cordless mowers, specifically models PBLLM05, RY401170/RY401017, and RY401180/RY401018. It features a half-moon and square center hole configuration for secure mounting and is intended for general grass cutting on residential lawns.

Fitment & Compatibility

Before buying, verify your mower’s deck size is exactly 20 inches (measure from blade tip to blade tip). Confirm your RYOBI model number is listed above—these blades are not universal and won’t fit other brands or non-40V RYOBI mowers. Check your blade’s center hole shape: this replacement uses a combination half-moon and square hole, not a standard round or star pattern. Measure the blade length, width, and thickness to match the OEM part (typically 20" x 2.5" x 0.1"). If your mower uses a different hole pattern or length, this set won’t work.

Key Things to Buy

• Quality: Aftermarket blade; price is high for a 2-pack, but 5.0 rating suggests good durability. Sharpness and balance may vary from OEM—inspect before installing.
• Installation: Easy with basic tools (socket wrench). Ensure blades are mounted with cutting edges facing the correct direction (usually upward toward the deck). Torque bolts to manufacturer spec (typically 40-50 ft-lbs).
• Common Gotchas: The half-moon/square hole design is specific to these RYOBI models—double-check your old blade’s hole shape. Aftermarket blades may need balancing after installation to avoid vibration. Replace blades every 25-50 hours or when dull, not just at season’s end.
• Safety: Disconnect battery before handling. Wear gloves—blades are sharp.

Should You Buy It

If you own one of the listed RYOBI 40V mowers and want a direct-fit, high-rated aftermarket option, this 2-pack is a solid choice. It’s a good value for those who prefer a quick, compatible replacement without modifying the blade mount. However, if you have a different RYOBI model or want OEM parts, look elsewhere.