Mower Blade 19.21" Replacement for Ryobi 682162001 635373001 AC04020, Compatible with Ryobi 40V 20-Inch Deck Mowers RY401011 RY401012 RY40108 RY40109, Circle Center Hole 1 Pack

What It Is

This is a 19.21-inch replacement mower blade designed for Ryobi 40V battery-powered mowers with a 20-inch cutting deck. It’s a direct-fit aftermarket alternative to OEM part numbers 682162001, 635373001, and AC04020, intended for mulching or standard cutting.

Fitment & Compatibility

• Deck size: Only for 20-inch Ryobi mowers. Measure your existing blade length—this is 19.21 inches from tip to tip.
• Center hole: Circle center hole (not star-shaped). Verify your spindle has a round hole, not a D-shape or keyed pattern.
• Model match: Confirmed compatible with Ryobi RY401011, RY401012, RY40108, and RY40109. Check your model number on the mower’s sticker under the battery or rear flap.
• OEM vs aftermarket: This is not a genuine Ryobi blade. It may have slight weight or balance differences—always check blade balance before installing.

Key Things to Know

• Check balance: Aftermarket blades often need balancing. Use a blade balancer or a simple nail-in-wall trick. An unbalanced blade vibrates, wears bearings, and cuts unevenly.
• Installation torque: Tighten the center bolt to 35–40 ft-lbs (use a torque wrench). Over-tightening can strip the spindle; under-tightening can loosen during operation.
• Sharpness out of box: Some users report the blade edge is dull compared to OEM. Consider sharpening it before first use for a cleaner cut.
• Warranty note: Using non-OEM blades may void your mower’s warranty if a blade-related failure occurs. Keep your old OEM blade as a spare.

Should You Buy It

If you need a budget-friendly replacement for a Ryobi 40V 20-inch mower and are comfortable checking blade balance and sharpening, this is a workable option. But for the same price, a genuine Ryobi blade (e.g., OEM 682162001) may offer better reliability and fit without the hassle. Skip it if you want zero fuss or have a model not listed above.