3-Pack Mower Blades 532173921 / 173920 / 173921 for Husqvarna / AYP 48 Inch Deck

Overview

These 532173921 / 173920 / 173921 mower blades are a 3-pack of aftermarket replacement blades for select Husqvarna and AYP 48-inch mower deck applications that use this part-number path.

This listing includes 3 mower blades.

Important: Match your original blade number, blade length, center-hole style, and deck configuration before ordering. Do not order by deck size or appearance alone.

Key Features

• 3-pack replacement mower deck blades
• Primary Blade Number Path: 532173921 / 173920 / 173921
• Blade Length: 16-5/8 inch
• Blade Width: 2-1/2 inch
• Center Hole: 5-point star
• Style: Mulching
• Deck Size Path: 48-inch (3 blades required)

Compatible Brands & Model Series

These blades are intended for select Husqvarna and AYP mower decks that use the 532173921 / 173920 / 173921 blade path.

• Husqvarna: select 48-inch deck applications including certain Z248F and related Z200-series / YTH / GTH platforms when the original blade number matches
• AYP / Poulan / Craftsman: select 48-inch deck applications using the same blade numbers

Fitment note: Model names and deck size are only starting points. Always confirm the original blade number, length, center-hole style, and blade layout before ordering.

Replaces Common Blade Numbers

• 532173921
• 173920
• 173921
• 532-173921

Blade Specifications

• Length: 16-5/8 inch
• Width: 2-1/2 inch
• Center Hole: 5-point star
• Style: Mulching
• Quantity: 3 blades (standard for 48-inch decks on this path)

Before Ordering

Confirm all of the following before ordering:

• Your original blade number matches 532173921, 173920, or 173921
• Your blades measure approximately 16-5/8″ long with a 5-point star center hole
• Your mower uses a 48-inch deck that requires three blades
• Your spindle shafts, blade bolts, and washers are in good condition

Do not install blades until fitment is confirmed. Installed blades are typically not eligible for return.

Common Symptoms of Worn Mower Blades

• Uneven or ragged cut quality
• Grass tearing instead of clean cutting
• Visible wear, cracks, bends, or rounded edges
• Increased deck vibration
• Reduced performance in thick or wet grass

Installation Notes

• Park the mower on a level surface and disconnect the spark plug wire
• Mark blade orientation before removing the old blades
• Inspect spindles, blade bolts, and washers before installing new blades
• Compare the new blades side-by-side with your originals
• Torque blade bolts to the manufacturer’s specification and check blade tip clearance

Why Buy From PTO Direct USA?

• Fast USA shipping
• Fitment-first product descriptions
• Clear part-number routing for mower deck repairs
• Deck parts organized by belts, blades, spindles, pulleys, and rebuild kits
• Support for homeowners, repair shops, and mower owners

Need Help Confirming Fitment?

Send us your mower model / product number, deck size, original blade number, and clear photos of the original blade (including the center hole) and the mower identification tag before ordering.

FAQ

What blade numbers do these replace?

These blades replace the 532173921 / 173920 / 173921 path on supported 48-inch applications.

What are the blade measurements?

Approximately 16-5/8 inch length, 2-1/2 inch width, with a 5-point star center hole.

Can I order these blades by deck size only?

No. Deck size is only a clue. Match the original blade number, length, center-hole style, and blade layout first.

How many blades are included?

This listing includes 3 blades, which is the normal quantity for a full set on a 48-inch deck using this path.

Need other deck parts? Browse mower deck belts, spindle assemblies, deck pulleys and idlers, and deck rebuild kits.

Need a different blade? Browse the full mower blades collection.