Husqvarna 521981501 18-Inch Gator Blade – Genuine OEM Replacement Mower Blade

Part Number: 521981501
Category: Zero-Turn Mower Blades, Mulching Blades & Cutting Deck Parts
Type: 18-Inch Gator Blade – Genuine OEM Replacement Mower Blade

The Husqvarna 521981501 18-Inch Gator Blade is a genuine OEM replacement cutting blade designed for select Husqvarna zero-turn mowers and compatible 52-inch cutting deck applications. Husqvarna's official illustrated parts documentation identifies 521981501 as “BLADE, 18" GATOR” and specifies a quantity of three on applicable mower deck configurations.

Product Specifications

• Part Number: 521981501
• Manufacturer: Husqvarna
• Product Type: Gator Mower Blade
• OEM Description: Blade, 18" Gator
• Blade Length: 18"
• Blade Style: Gator / Mulching
• Component Type: Mower Deck Cutting Component
• Application: Zero-Turn Lawn Mower
• Compatible Brand: Husqvarna
• Documented Models: MZ5225 / MZT52
• Documented Deck Application: 52" Cutting Deck
• Blades Required for Applicable 52" Deck: 3
• Mounting Style: Star Center
• System: Mower Deck / Cutting System
• Replacement Type: Direct OEM Replacement
• OEM Status: Genuine Husqvarna OEM Part
• Condition: New
• Quantity: 1 Blade
• UPC: 705788537402
• Part Number Reference: 521981501

Husqvarna parts sources consistently identify 521981501 as a genuine 18-inch Gator blade.

Features & Benefits

• Genuine Husqvarna OEM replacement mower blade
• Factory-designated 18" Gator Blade
• Designed for select Husqvarna zero-turn mowers
• Compatible with documented 52-inch mower deck applications
• Gator-style cutting profile
• Designed for effective grass cutting and clipping processing
• Suitable for compatible mulching configurations
• Helps circulate and recut grass clippings within the mower deck
• Helps restore cutting performance when replacing worn blades
• Manufactured for the applicable Husqvarna spindle and deck configuration
• Factory-style 18-inch blade dimensions
• Star-style center mounting configuration
• Designed to maintain proper blade positioning and deck clearance
• Suitable for routine mower deck maintenance
• Ideal replacement for dull, worn, bent, chipped, cracked, or damaged blades
• Direct replacement for equipment requiring 521981501
• Genuine OEM blade rather than an unspecified aftermarket substitute

Documented Applications

The Husqvarna 521981501 18-Inch Gator Blade is documented for select Husqvarna zero-turn mower applications, including:

• Husqvarna MZ5225
• Husqvarna MZT52
• Select Husqvarna 52-inch zero-turn mower decks
• Compatible 52-inch mulching configurations
• Mower decks specifying three 18-inch Gator blades
• OEM replacement applications requiring 521981501

Husqvarna's official MZ5225 parts diagram lists three 521981501 18-inch Gator blades in the accessories/mulching configuration.

A separate parts reference specifically lists the genuine 521981501 18" Gator Blade as fitting the Husqvarna MZT52.

52-Inch Deck Configuration

On applicable 52-inch mower decks, three 18-inch blades work together to provide coverage across the deck's cutting width. Husqvarna's MZ5225 documentation specifies:

• Part Number: 521981501
• Description: Blade, 18" Gator
• Quantity Required: 3

This listing is for one blade unless otherwise specified, so three individual blades would be required when replacing the complete set on a documented three-blade deck.

Gator Blade Design

Gator-style mower blades are commonly used for mulching and clipping-management applications. The blade's profile helps move grass clippings within the mower deck so they can be cut into smaller pieces before being discharged or returned to the lawn.

For best results, the blade should be used only on mower and deck configurations specifically approved for 521981501.

An Oregon Gator G5 replacement cross-reference for Husqvarna 521981501 specifies an 18-inch blade with a five-point star mounting configuration, further confirming the basic blade dimensions and mounting style associated with this OEM application.

Important Notes

• Verify compatibility with your exact Husqvarna mower model, product number, serial number, cutting deck size, spindle configuration, and production revision before ordering.
• Husqvarna identifies 521981501 as “BLADE, 18" GATOR.”
• Match part number 521981501 directly with the number shown in your mower's illustrated parts diagram or OEM documentation.
• This is an 18-inch Gator-style mower blade intended for specific compatible mower deck configurations.
• The Husqvarna MZ5225 parts diagram specifies three blades for the applicable configuration.
• This listing is for one blade unless otherwise specified.
• Do not assume that three blades are included simply because an applicable mower deck requires three.
• Do not select a replacement blade based solely on overall length or appearance.
• Mower blades can differ in length, width, thickness, center-hole configuration, lift profile, cutting geometry, offset, and rotation requirements.
• Verify the star mounting configuration against your existing spindle before installation.
• Do not substitute a blade with an incompatible center-hole pattern.
• Inspect all blades on a multi-blade deck when replacing one damaged or excessively worn blade.
• For consistent cutting and reduced vibration, blades installed on the same deck should be in comparable serviceable condition.
• Inspect the blade spindle, spindle bearings, mounting hardware, washers, adapters, and surrounding mower deck components when replacing the blade.
• If a blade was damaged by striking a rock, stump, curb, or other solid object, inspect the spindle and deck for corresponding impact damage.
• Never straighten and reuse a severely bent mower blade.
• Replace blades that are cracked, deeply chipped, excessively worn, or otherwise structurally compromised.
• If sharpening a serviceable blade, maintain the original cutting profile and ensure the blade remains properly balanced.
• An unbalanced blade can create excessive vibration and accelerate spindle, bearing, and mower deck wear.
• Install the blade in the correct factory orientation with the cutting edges and lift surfaces positioned as specified by Husqvarna.
• Make sure the blade is fully seated against the spindle mounting surface before tightening the hardware.
• Tighten blade hardware to the mower manufacturer's specified torque.
• After installation, verify adequate clearance between all three blades and surrounding deck components before operating the mower.
• Never operate the mower with damaged, loose, incorrectly installed, or improperly balanced blades.
• Shut off the mower, engage the parking brake, remove the ignition key, disconnect the spark plug or battery where applicable, and wait for all moving components to stop before servicing the cutting deck.
• Wear heavy protective gloves when handling mower blades.
• This listing is for one Husqvarna 521981501 18-Inch Gator Blade only unless otherwise specified. Blade bolts, washers, spindles, adapters, baffles, mulch caps, and other mower deck components are sold separately.
• Match part number 521981501 with your equipment's illustrated parts diagram or OEM documentation before ordering to ensure proper fitment.