Stens 310-020 Standard Blade Compatible with/Replacement for Ryobi RY401150US, RY401140US, RY401200 and RY4011060US Mowers 682534, AC04025 7/8" Center Hole, 3 7/16" Center to Center, 21" Length

What It Is

The Stens 310-020 is a 21-inch replacement blade designed for Ryobi 40V brushless mowers, including models RY401150US, RY401140US, RY401200, and RY4011060US. It serves as a direct aftermarket alternative to Ryobi OEM blades (part numbers 682534, AC04025) for standard mulching or bagging cuts.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 21 inches (not 20 or 22). Measure the center hole diameter—it must be 7/8 inch. Check the distance between mounting holes: 3 7/16 inches center-to-center. This blade fits Ryobi 40V mowers listed above, but it will NOT fit older Ryobi models with a 1-inch center hole or different bolt patterns. Verify your mower’s blade mounting uses a single center bolt and two alignment pins (common on these Ryobis). If your mower has a different blade retention system, this Stens blade won’t work.

Key Things to Know

• Quality vs OEM: Stens blades are made from tempered steel and are generally comparable to Ryobi OEM blades. Some users report slightly shorter edge retention, but they cut well for the price.
• Installation difficulty: Easy—requires a 15/16-inch socket or wrench. Lift mower, remove center bolt (counterclockwise), swap blade, torque to 30-40 ft-lbs. Always disconnect battery first.
• Common gotchas: The blade may be slightly thinner than OEM (around 0.1 inch vs 0.125 inch), which can cause minor vibration on some mowers. Check balance before final install. If your mower uses a washer or spacer, reuse the original—Stens doesn’t include hardware.
• Sharpness: Comes sharp out of box but may need a quick hone if you prefer a razor edge. Not ideal for heavy-duty mulching of thick, wet grass—use OEM for that.

Should You Buy It

Buy this Stens 310-020 if you want a reliable, budget-friendly replacement for your Ryobi 40V mower and don’t mind a slightly thinner blade that may vibrate a bit more than OEM. It’s a good choice for standard residential cutting, but skip it if you need heavy mulching performance or prefer the exact OEM fit and finish.