406712, 532406712 Lawn Mower Blade for Craftsman Husqvarna 21 inch Deck Push Walk Behind Lawnmower, Circle Mulching Lawn Mower Blade, Replacement Part 165833, 175064, 189028,532165833, 531300765

What It Is

This is a 21-inch circle mulching blade (OEM part 406712 / 532406712) designed for Craftsman and Husqvarna walk-behind push mowers with a 21-inch cutting deck. It’s intended for fine mulching—chopping clippings into small particles that decompose quickly—rather than bagging or side-discharge.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Your mower deck must be exactly 21 inches. Measure blade-to-blade or check your mower’s model number.
• Blade measurements: This blade has a 21-inch length, a 1-inch center hole, a 0.5-inch offset (for blade tip clearance), and a 0.25-inch thickness. If your original blade matches these, it’s compatible.
• Cross-reference part numbers: Confirmed fit for OEM numbers 165833, 175064, 189028, 532165833, and 531300765. It replaces many Craftsman and Husqvarna blades from the 2000s–2010s. Not compatible with 20-inch or 22-inch decks.

If your mower uses a “star” or “D” shaped center hole, this round-hole blade will not fit without an adapter.

Key Things to Know

• Quality: 4.7 stars from 48 reviews—users report good balance and sharpness out of the box. It’s a solid OEM-style replacement, not a premium aftermarket blade.
• Installation difficulty: Easy—remove the old blade (use a block of wood to hold it), then install this one with the “grass side” facing the deck. Torque the bolt to 40–50 ft-lbs.
• Common gotcha: This is a mulching-only blade. If you frequently bag or side-discharge, look for a combo blade instead. Also, check your mower’s spindle—some older models use a different hole pattern.
• Lift vs. mulching: The blade has a low-lift design, which reduces engine load but may not throw clippings far in wet grass. For dry, normal lawns, it works great.

Should You Buy It

Yes, if you have a 21-inch Craftsman or Husqvarna push mower and want a reliable, budget-friendly mulching blade that fits standard OEM specs. Skip it if you need a bagging or high-lift blade, or if your mower uses a non-round center hole. For most homeowners doing weekly cuts, this is a solid, no-hassle replacement.