Husqvarna 580258102 Lawn Mower 21-in Deck 4-in-1 Blade Genuine Original Equipment Manufacturer (OEM) Part

What It Is

The Husqvarna 580258102 is a genuine OEM 21-inch 4-in-1 blade designed for Husqvarna walk-behind mowers. It combines mulching, bagging, side discharge, and leaf shredding into one blade, making it ideal for residential lawns with varied debris.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: Only fits 21-inch cutting decks. Measure your deck’s cutting width—not the blade length—to be sure.
• Model fit: Works with Husqvarna models like HU700H, HU725H, HU775H, and select 21-inch LC series mowers. Check your owner’s manual or existing blade part number. Not compatible with older Husqvarna models using a different center hole pattern.
• Measurements: Blade length is 21 inches, center hole diameter is 5/8 inch, and the center-to-center mounting hole distance is 3-3/8 inches. Measure your old blade’s hole spacing to verify.
• OEM vs aftermarket: This is a genuine Husqvarna part, ensuring exact fit, balance, and material specs. Aftermarket blades may vary in thickness or hole alignment.

Key Things to Know

• Quality: Made from hardened steel with a coated finish to resist rust. Expect longer edge retention than most aftermarket blades.
• Installation: Moderate difficulty—requires a socket wrench and blade removal tool. Always disconnect the spark plug and tip the mower with the carburetor up to avoid oil leaks.
• Common gotcha: The 4-in-1 design has a more complex shape than standard blades. If you only bag or only mulch, a dedicated blade may perform better. This blade is a compromise for versatility.
• Balance: OEM blades are factory-balanced, but after installation, double-check balance on a blade balancer to avoid vibration.

Should You Buy It

If you own a compatible Husqvarna 21-inch mower and want a single blade that handles mulching, bagging, side discharge, and leaf shredding without switching blades, this is a reliable, well-reviewed OEM choice. It’s not the best for heavy-duty mulching or commercial use, but for a typical homeowner with mixed lawn conditions, it delivers solid performance and long life.