Husqvarna 586179801 Lawn Mower 22-in Deck Mulching Blade Genuine Original Equipment Manufacturer (OEM) Part

What It Is

This is a genuine OEM mulching blade for Husqvarna 22-inch cutting decks, designed to recirculate clippings into fine particles that decompose quickly as fertilizer. It replaces worn or damaged blades on compatible Husqvarna walk-behind mowers.

Fitment & Compatibility

Must check before buying:

• Deck size: Only fits 22-inch cutting decks. Measure your deck width from blade tip to blade tip.
• Model compatibility: Works with Husqvarna models like LC221A, LC221RH, LC221SP, LC321A, LC321SP, and many others. Verify your exact model number (stamped on the mower frame or under the seat).
• OEM vs aftermarket: This is a genuine Husqvarna part (OEM #586179801). Aftermarket blades may differ in thickness, hole pattern, or balance.
• Blade measurements: Center hole diameter is 1 inch (25.4mm), overall length is 22 inches, and the blade has a 0.25-inch thickness. Confirm these match your current blade.
• Shaft type: Fits standard 1-inch crankshafts. Not for engines with a smaller or larger output shaft.

Key Things to Know

• Quality: OEM blades are heat-treated and balanced for less vibration and longer life than generic alternatives. Expect 25–50 hours of use before dulling, depending on grass conditions.
• Installation: Moderate difficulty. Requires a socket wrench and torque wrench (recommended torque: 40–50 ft-lbs). Always lift the mower, disconnect the spark plug, and wear gloves.
• Common gotchas:
  • The blade is directional—install with the curved side facing the deck (up) for proper mulching.
  • Never sharpen a mulching blade beyond its original profile; it will lose mulching efficiency. Replace instead.
  • Check for deck damage or bent blade spindles before installing—a warped deck will ruin a new blade quickly.
• Safety: Always use a blade removal tool or block wood to prevent rotation when loosening the bolt.

Should You Buy It

Buy this if you own a Husqvarna 22-inch walk-behind mower and want a direct-fit, reliable mulching blade that minimizes clippings and feeds your lawn. It’s ideal for homeowners who mow frequently (no bagging) and prefer OEM quality over cheaper aftermarket options. Skip it if you need a bagging or standard lift blade, or if your deck is a different size.