New Aftermarket Mulching Blade for 20-Inch AYP Walk-Behind Lawn Mowers Replaces 145106 532145106

What It Is

This is an aftermarket mulching blade designed to replace the OEM AYP part 145106 (also 532145106) on 20-inch walk-behind mowers. It cuts grass into fine clippings that settle into the lawn as natural fertilizer, eliminating the need for bagging on most residential lawns.

Fitment & Compatibility

Before buying, measure your current blade’s center hole diameter (must be 1-inch), overall length (20 inches), and the distance between mounting holes (usually 3-3/4 inches on center). This blade fits many AYP (American Yard Products) brands including Craftsman, Husqvarna, Poulan, and McCulloch models with a 20-inch cutting deck. Confirm your mower’s model number ends in a suffix that uses the 145106 blade—check the OEM parts diagram or your owner’s manual. Aftermarket blades may have slightly different balance or thickness than OEM, so compare the blade’s thickness (typically 0.125–0.150 inches) to avoid clearance issues with the mower deck.

Key Things to Know

• Quality variance: With only one review at 4.0 stars, this is a low-volume aftermarket part. Inspect the blade for sharpness, burrs, and consistent edge grind before installing.
• Installation difficulty: Medium. Requires a socket wrench (usually 9/16-inch or 5/8-inch) and a blade removal tool or block of wood to prevent spinning. Torque the center bolt to 30–40 ft-lbs—overtightening can strip the crankshaft.
• Balance matters: Aftermarket blades are not always balanced. If you feel vibration after install, remove the blade and check balance on a nail or balancer. Unbalanced blades damage the spindle and cause poor cut quality.
• Mulching performance: This blade’s curved design lifts grass and recirculates clippings. It works best when you mow dry grass and only cut 1/3 of the blade height—wet or tall grass will clump.

Should You Buy It

If you have a 20-inch AYP-based mower and want an affordable mulching blade for light to moderate residential use, this is a reasonable option—but only if you’re comfortable checking balance and fitment yourself. For heavy use or precise cutting, stick with an OEM blade from a local dealer to ensure consistent quality and warranty coverage.