GANCO 532405380 405380 Mulching Blades Replacement Part for Husqvarna RZ4621BF RZ4622 RZ4622TBF Lawn Mower with 46" Deck (Pack of 2 Lawn Mower Blades)

What It Is

This is a set of two aftermarket mulching blades designed for Husqvarna zero-turn mowers with a 46-inch cutting deck. They replace OEM part numbers 532405380 and 405380, and are intended for fine mulching of grass clippings rather than side discharge or bagging.

Fitment & Compatibility

• Deck size: Only fits Husqvarna 46-inch decks (not 42” or 54”).
• Compatible models: Husqvarna RZ4621BF, RZ4622, RZ4622TBF. Also fits some Craftsman, Poulan Pro, and McCulloch models with the same deck and spindle pattern. Verify your deck model number before buying.
• OEM vs aftermarket: GANCO is an aftermarket brand. It matches OEM dimensions (21.5” length, 2.5” width, 0.25” thickness, 1” center hole with a 5-point star drive), but may have slightly different balance or steel hardness.
• Measurements: Confirm blade length (21.5”), center hole size (1”), and drive pattern (5-point star) on your current blade. If your blade has a different drive pattern or offset, this set won’t fit.

Key Things to Know

• Mulching performance: These blades have a higher lift and curved edge to recut clippings. They work best with a mulching kit (baffle/plug) installed; without it, clippings will be coarser.
• Installation difficulty: Easy—requires a socket wrench and torque to 70-90 ft-lbs. Use thread locker on the blade bolt if it’s not pre-applied.
• Common gotcha: The star drive pattern can be slightly tight on some spindles. If it doesn’t seat fully, tap it with a mallet or file the spindle lightly. Do not force it.
• Quality note: Steel is adequate for residential use but may dull faster than OEM on sandy or heavy clay soil. Check balance before installing—unbalanced blades cause vibration.

Should You Buy It

If you have a compatible Husqvarna 46-inch zero-turn and want an affordable mulching upgrade without paying OEM prices, this is a solid choice. It’s best for homeowners mowing typical turf; commercial operators or those with very rough terrain should stick with OEM or premium aftermarket blades.