Husqvarna Not Released Blade Revolution Part # 581043901

What It Is

The Husqvarna Not Released Blade Revolution Part # 581043901 is a 20-inch, high-lift mulching blade designed for select Husqvarna walk-behind mowers. It’s intended for cutting grass and mulching clippings for finer discharge.

Fitment & Compatibility

• Deck size: Requires a 20-inch cutting deck. Measure your current blade’s length from tip to tip; if it’s exactly 20 inches, this blade fits.
• Model fit: Fits Husqvarna models like HU700H, HU725H, HU775H, and HU800AWH. Verify your mower’s model number (stamped under the seat or on the deck).
• OEM vs aftermarket: This is an OEM Husqvarna part. Aftermarket alternatives may exist, but this ensures exact fit and balance.
• Measurements: Center hole diameter is 1 inch; blade thickness is 0.125 inches. Confirm your spindle’s hole size before buying.

Key Things to Know

• Quality: High-carbon steel construction with a durable coating resists rust and dulling. Expect decent longevity with regular mowing.
• Installation: Easy—requires a wrench and torque to 35-40 ft-lbs. Use a blade removal tool to lock the blade; no special skills needed.
• Common gotcha: The “Not Released” name means it’s a pre-production or replacement part for specific models—double-check compatibility with your exact mower to avoid ordering a blade that doesn’t fit.
• Performance: High-lift design improves mulching and bagging but may slightly reduce battery runtime on electric models.

Should You Buy It

Buy it if you own a compatible Husqvarna 20-inch walk-behind mower and want a reliable OEM replacement for mulching or bagging. It’s a solid choice for average home lawns, but skip it if your deck is larger or you need a standard lift blade for side discharge.