Grasscool 21 inch Lawn Mower Mulching Blades Replace Craftsman 406712 532406712 for Husqvarna 21'' Deck Push Walk Behind Lawnmower 165833 175064 189028 532189028 (2Pack)

What It Is

This Grasscool 21-inch mulching blade set (2-pack) is designed to replace Craftsman OEM part 406712/532406712 and fits Husqvarna 21-inch deck push walk-behind mowers. It’s intended for fine grass clipping recycling, not bagging or side-discharge.

Fitment & Compatibility

Before buying, confirm three things:

1. Deck size: Must be exactly 21 inches (measured blade tip to tip). This blade is 21” long with a 1” center hole and 5-point star drive pattern.
2. Model numbers: Directly replaces Craftsman 406712, 532406712, and Husqvarna parts 165833, 175064, 189028, 532189028. Fits most Husqvarna 21” push mowers (e.g., LC221A, LC221RA, LC221RH) and Craftsman models using those OEM numbers.
3. Blade type: This is a mulching blade (curved, with more surface area). If your mower currently uses a standard or high-lift blade, you may need to adjust deck height or swap to a mulching plug/cover.

Check your mower’s blade mounting system: Some Craftsman/Husqvarna decks use a single bolt with a star washer; others use a 5-point star pattern. This blade matches the star pattern—verify your mower uses that, not a 4-point or keyed hole.

Key Things to Know

• Material: Grasscool blades are made of hardened steel, but may be slightly thinner than OEM. Expect faster dulling if you hit rocks or roots regularly.
• Installation difficulty: Easy—lift mower, remove center bolt, swap blade, torque to 35-45 ft-lbs. Use a blade removal tool or block wood to prevent spinning. Recheck after first use.
• Balance: These blades are not always perfectly balanced out of the box. You may need to file or sand the heavy side to avoid vibration; a cheap blade balancer is recommended.
• Mulching performance: Works best with dry, short grass. Wet or tall grass will clump—raise deck height or make multiple passes.

Should You Buy It

If you need a budget-friendly mulching blade set for a 21” Craftsman or Husqvarna walk-behind and don’t mind occasional balancing, this is a solid value at ~$14 per blade. For heavy-duty use or commercial mowing, stick with OEM Craftsman or Oregon blades for longer life and better balance.