20'' Mower Blade AC04020 Replacement for Ryobi RY40180 RY40190 RY401110 RY401011 RY401120 RY40LM30 20inch Deck Lawn Mower,Steel Low Lift Blade Replace 682162001 635373001,1Pack

What It Is

This is a 20-inch steel low-lift replacement blade designed for Ryobi 40V cordless mowers with a 20-inch cutting deck. It’s meant for standard residential grass cutting on flat terrain—low-lift blades reduce clumping and are ideal for bagging or side-discharge use.

Fitment & Compatibility

Before buying, verify three things:

1. Deck size – Must be exactly 20 inches. Measure your deck’s cutting path, not the blade itself.
2. Model compatibility – Fits Ryobi RY40180, RY40190, RY401110, RY401011, RY401120, and RY40LM30. Double-check your model number on the mower’s label (usually under the battery or rear flap).
3. OEM vs aftermarket – This is a direct replacement for OEM part numbers 682162001 and 635373001. It’s not a universal blade—only for Ryobi 40V 20-inch mowers. Center hole and mounting pattern are specific; do not use on other brands or deck sizes.

Key Things to Know

• Quality – Steel construction, but 23 reviews at 4.3 stars suggest decent durability for typical residential use. Some users report it’s slightly thinner than OEM; check your original blade thickness if you mow heavy or damp grass frequently.
• Installation – Easy with a socket wrench (usually 15/16” or 5/8” nut). Torque to 30-40 ft-lbs. Use a blade balancer after install—poor balance causes vibration and bearing wear. Always disconnect the battery before flipping the mower.
• Common gotchas – Low-lift blades won’t mulch as well as high-lift or mulching blades. If you need fine mulching, look for a dedicated mulching blade for your Ryobi. Also, this is a 1-pack—you need only one blade for a 20-inch deck, but check if your mower uses two (some Ryobi 20-inch models are single-blade; confirm yours).

Should You Buy It

Buy this if you have a compatible Ryobi 40V 20-inch mower and want a straightforward OEM-style replacement for bagging or side-discharge mowing. It’s a good value for light-to-moderate residential lawns. Skip it if you need heavy mulching or a thicker, heavy-duty blade for tall, wet grass—consider a premium aftermarket alternative.