Cluparis 21 in Mulching Blade for Walk-Behind Mowers — 5/8 in Center Hole, OEM Fit

Cluparis 532406712 is a 21-inch mulching replacement blade engineered to restore cutting performance on compatible AYP, Husqvarna, Poulan and Craftsman walk-behind mowers.

If your mower deck measures 21 inches and the original blade is worn, bent, or missing, this Cluparis mulching blade delivers the fit and blade geometry needed for even clippings and improved bagging and mulching action. Made to match common OEM hole patterns and deck clearances, it installs like the factory part so you can get back to mowing without deck modification.

Which machines will this blade fit?

This blade replaces many factory part numbers used across AYP, Craftsman, Husqvarna and Poulan models. It fits a wide range of 21-inch walk-behind mower decks that use a 5/8-inch center hole and the same mounting orientation. Double-check your deck specifications and part reference to confirm compatibility.

• Replaces OEM numbers such as 165833, 175064, 176135, 189028, 406706, 532406712 and related variants.
• Compatible with AYP and Craftsman models listed in product documentation.
• Fits Husqvarna 21" decks including several walk-behind series and part references.
• Works with many Poulan 21" walk-behind mower models.

How does the blade’s size and mounting match my mower?

The Cluparis mulching blade measures 21 1/16" long with a 5/8" center hole, a 0.138" thickness and a 2 1/4" width. These dimensions are designed to mirror common factory blades so the blade clears the deck and spindle while preserving correct cutting height and balance. Proper fit helps avoid vibration and ensures the blade’s mulching lip performs as intended.

• Overall length: 21 1/16" for 21" decks.
• Center mounting hole: 5/8" to match standard spindles.
• Material thickness: 0.138" for durability and stiffness.
• Blade width: 2 1/4" to maintain deck clearance and lift.

What cutting performance should I expect?

As a mulching-style blade, this model features a lip and cutting profile that reduces clump size and helps recut clippings into finer pieces. Expect improved distribution of clippings across the deck and better breakdown on the lawn compared with a standard flat blade. Note that actual results depend on grass type, mowing height, and engine speed.

• Mulching profile designed to recut clippings for smaller particles.
• Balanced design reduces vibration when installed correctly.
• Helps with even mulch distribution across a 21" deck.
• Works best when mower is properly maintained and sharp blade is used.

How do I install and maintain the replacement blade?

Installation follows the same steps as replacing an OEM blade: disconnect spark plug, tilt mower to access the blade, remove the spindle nut, swap blades, torque the nut to factory spec, and check balance. Keep the blade sharp and free of nicks to maintain cutting quality; inspect mounting hole and blade seat for wear to avoid wobble.

• Always disconnect the spark plug before service.
• Use proper tools and torque to secure the 5/8" spindle nut.
• Sharpen blade edges periodically for best performance.
• Replace if bent or cracked to prevent deck or engine damage.

Who is this for: This Cluparis 532406712 mulching blade is intended for homeowners, landscapers, and service shops who need a reliable, OEM-compatible replacement for 21-inch walk-behind mower decks. If you own an AYP, Craftsman, Husqvarna, or Poulan mower from the compatible model lists and you want to restore mulching performance without altering the deck, this blade provides a direct-fit, durable option that mirrors factory geometry.