Grasscool 21-inch Mulching Mower Blade for Craftsman/Husqvarna — Circle Center, Heat-Treated Steel 5/32" Thick

Grasscool 21-inch mulching replacement blade 406712 is a direct-fit steel mulching blade designed to restore cutting performance on Craftsman and Husqvarna 21" push mowers with a circle center hole.

If your 21" walk-behind mower is leaving uneven clippings or needs a durable replacement, these Grasscool blades deliver the correct length, thickness and lift profile to mulch efficiently. They are engineered as commercial-style mulching blades with specifications that match OEM replacement numbers 165833, 175064, 189028, 406712 and the 532-series equivalents. Before ordering, confirm your mower’s center hole pattern is the circular type — some models use a bow-tie or 5-star pattern and require a different part number.

How do these blades improve mulching and lawn appearance?

These blades have a raised air-lift profile and a 21" cutting span that chops grass clippings into finer pieces for faster decomposition and neater results. The combination of blade length, top lift and sharpened edge helps circulate clippings back through the deck, reducing visible grass strips and improving mulch distribution.

• 21" length (534 mm) for full deck coverage
• 1-1/8" (28 mm) air lift to keep clippings suspended for re-cutting
• 5/32" (4 mm) steel thickness for durability
• Compatible with OEM numbers 165833 / 175064 / 189028 / 406712

Will these blades fit my Craftsman or Husqvarna mower?

They fit 21" push mowers that accept a circle center hole mounting pattern. Many Craftsman and Husqvarna models share these dimensions, but both brands sometimes used alternate mounting patterns; check the center hole shape before purchase. Do not rely solely on model numbers—verify blade length, hole shape and thickness against your original blade.

• Center hole shape: circle (not bow-tie or 5-star)
• Deck size compatibility: 21"
• If your mower uses bow-tie or 5-star holes, order the corresponding MPN listed by your manufacturer

How durable and ready-to-use are these replacement blades?

Manufactured from heat-treated steel, these mulching blades are 5/32" thick to resist bending and wear under typical lawn conditions. The blades are painted for corrosion protection during shipping; that coating does not need to be removed and will wear off after short use.

• Heat-treated steel construction for extended life
• Protective paint finish prevents surface rust in storage
• Ready to install—no stripping of paint required

What must I check before ordering replacement blades?

Double-check three critical measurements: blade length, center hole shape and thickness. Even when a replacement number matches your mower’s manual, variations in mounting pattern can make a blade incompatible. If unsure, remove your old blade and compare or photograph the center hole for confirmation.

• Measure blade length across the cutting edge: 21" (534 mm)
• Confirm center hole is circular and matches mounting hardware
• Verify blade thickness and lift height against original blade

Who this is for: Lawn owners, maintenance crews and small landscapers who need a reliable, OEM-equivalent mulching blade for 21" Craftsman or Husqvarna push mowers with a circular mounting hole. Choose Grasscool 406712 if you want a heavy-duty, ready-to-install replacement that restores mulching performance—just confirm the hole pattern and dimensions before buying.