Genuine OEM HUSQVARNA PARTS - Blade 21" H/D 539105711

What It Is

This is a genuine OEM Husqvarna 21-inch high-lift (H/D) mower blade designed for heavy-duty cutting and bagging performance. It’s intended for use on select Husqvarna walk-behind mowers with a 21-inch cutting deck, particularly models that require a high-lift blade for improved grass discharge and mulching.

Fitment & Compatibility

• Deck size: Must be exactly 21 inches. Measure your existing blade tip-to-tip or check your mower’s deck spec.
• Model fit: Primarily fits Husqvarna walk-behind mowers (e.g., LC221A, LC321A, LC421A series). Not for zero-turn or riding mowers.
• OEM vs aftermarket: This is genuine Husqvarna, so no adapter or modification needed. Aftermarket blades may have different hole patterns or thickness—verify center hole size (usually 1 inch) and spindle shape (usually star or oval).
• Measurements: Blade length 21”, center hole diameter 1”, offset/height matches OEM spec. Check your mower’s model number on the deck or manual for exact part cross-reference (539105711).

Key Things to Know

• Quality: High-carbon steel with hardened edge; lasts longer than budget blades but costs more.
• Installation difficulty: Easy—requires a socket wrench and blade removal tool (or wood block to lock blade). Torque to 35–50 ft-lbs.
• Common gotcha: High-lift blades increase suction and wear faster in sandy or dusty conditions. They also require more engine power—may bog down in tall, wet grass.
• Balance: Always check blade balance after sharpening or replacement; an unbalanced blade causes vibration and deck damage.

Should You Buy It

Buy this if you have a compatible Husqvarna 21-inch walk-behind mower and want a direct-fit, reliable OEM blade for heavy-duty cutting and bagging. It’s ideal for users who value longevity and consistent performance over cheaper alternatives. Skip it if your mower uses a different deck size or if you only need a standard lift blade for mulching.