Rotary 21" 9810 Mulching Lawn Mower Blade - Aftermarket Replacement for: AYP Sears Craftsman Husqvarna

What It Is

This is an aftermarket 21-inch mulching blade designed to replace OEM blades on select AYP, Sears Craftsman, and Husqvarna walk-behind mowers. It chops grass clippings finely and recirculates them into the lawn for natural fertilization.

Fitment & Compatibility

• Deck size: Only fits mowers with a 21-inch cutting deck—measure your existing blade length center-to-center (bolt hole to bolt hole) to confirm.
• Brand/model: Compatible with many AYP (American Yard Products), Craftsman (models with 21” decks), and Husqvarna walk-behind mowers using a 5-point star center hole (common on these brands). Check your owner’s manual for blade part numbers (e.g., 532-4144, 532-4198, 532-4292).
• OEM vs aftermarket: This is a third-party replacement, not OEM. It may have slight weight or thickness differences, but fitment is generally reliable.
• Measurements: Center hole diameter is 1” (star pattern), blade thickness ~0.1875” (3/16”), and overall length 21”. Verify your mower’s blade bolt pattern (usually 5-point star) matches.

Key Things to Know

• Quality: Solid 4.6-star average from 176 reviews—users report good durability and mulching performance for the price, but some note it’s slightly lighter than OEM blades.
• Installation: Straightforward if you have a socket wrench and blade removal tool. Torque the blade bolt to 35-45 ft-lbs (check your mower’s spec). Use thread locker on the bolt.
• Gotchas: Not for bagging or side-discharge use—mulching blades have a curved design that may not work well with those setups. Also, ensure your mower’s deck is clean and the blade is balanced after installation (use a balancer or mark the shaft).
• Common issue: The star hole may be tight on some mowers—gently file if needed, but don’t force it.

Should You Buy It

Buy this if you have a 21” AYP, Craftsman, or Husqvarna walk-behind mower and want a budget-friendly mulching blade that reliably fits and performs well for residential use. It’s a solid value for the price, but skip it if you need OEM exactness or run a commercial mower—stick with OEM for heavier-duty cutting.