Husqvarna 539105711 21" HD Blade – Replacement Lawn Mower Heavy-Duty Cutting Blade

Part Number: 539105711
Category: Lawn Mower Replacement Parts
Type: 21" HD Blade – Replacement Lawn Mower Heavy-Duty Cutting Blade

The Husqvarna 539105711 21" HD Blade is a replacement mower cutting blade designed for compatible Husqvarna lawn mowing equipment. Featuring a 21-inch heavy-duty (HD) configuration, this blade is intended to provide the cutting action required by the applicable mower deck and blade-drive system. Ideal for replacing a dull, bent, chipped, excessively worn, cracked, damaged, or unserviceable blade, the 539105711 helps restore proper cutting performance and the mower’s intended blade configuration.

Product Specifications

• Part Number: 539105711
• Brand: Husqvarna
• Product Type: Mower Blade
• Blade Length: 21"
• Configuration: HD / Heavy-Duty
• Component Type: Replacement Cutting Blade
• Application: Lawn Mower
• System: Mower Deck / Cutting System
• Function: Grass Cutting
• Condition: New

Features & Benefits

• Replacement 21-inch mower blade for compatible Husqvarna equipment
• Features the specified HD / heavy-duty configuration
• Designed to provide the cutting action required by the applicable mower deck
• Helps restore consistent cutting performance when the original blade becomes worn or damaged
• Supports the mower’s intended cutting-system configuration
• Suitable for routine mower maintenance, blade replacement, and cutting-system restoration
• Ideal for replacing a dull, bent, chipped, excessively worn, cracked, damaged, or unserviceable mower blade
• Practical replacement component for maintaining dependable lawn-cutting performance

Applications

• Husqvarna lawn mowers
• Compatible lawn and garden equipment
• Mowers requiring a 21" HD blade
• Mower deck cutting systems
• Grass-cutting applications
• Blade-drive assemblies
• Replacement of worn or damaged mower blades
• Lawn mower maintenance and repair
• Cutting-system restoration

Important Notes

• Verify part number 539105711 before ordering
• Confirm compatibility with your specific Husqvarna mower model and cutting-deck configuration
• Verify that your application requires a 21-inch HD blade
• Blade length alone does not determine compatibility
• The exact blade width, thickness, center-hole dimensions, mounting pattern, lift profile, cutting-edge configuration, and orientation are not identified in the supplied product information; compare these specifications with the original blade
• Do not assume this blade is specifically a mulching, bagging, high-lift, low-lift, or combination blade unless confirmed for your equipment
• Compare the original blade’s length, width, thickness, center hole, mounting pattern, cutting profile, lift design, and orientation
• Do not substitute a mower blade based solely on approximate length or appearance
• Inspect associated blade adapters, spindles, mandrels, shafts, washers, blade bolts, pulleys, bearings, and mounting hardware for wear or damage
• Never attempt to straighten, weld, or repair a cracked or severely bent blade for continued use
• Verify whether any blade bolts, washers, adapters, or other mounting hardware are included or must be purchased separately
• Shut off the mower, disconnect the appropriate power source, and ensure the blade has completely stopped before servicing the cutting system
• Use appropriate hand protection when handling mower blades, as the cutting edges may be sharp
• Install the blade in the correct orientation and direction and tighten mounting hardware according to the equipment manufacturer’s specifications
• After installation, verify proper blade retention, orientation, clearance, balance, and unobstructed rotation before returning the mower to normal operation