Grasscool 21 inch Lawn Mower Blade Replace Craftsman 406712 532406712 189028 532189028 for Husqvarna 21'' Deck Push Walk Behind with Circle Mounting Pattern 165833 175064

What It Is

This is a 21-inch replacement blade for push walk-behind mowers with a circle mounting pattern, designed to cut grass on residential lawns. It fits Craftsman, Husqvarna, and other mowers that accept OEM part numbers 406712, 532406712, 189028, or 532189028.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 21 inches (measured cutting width, not overall chassis). This blade uses a circle mounting pattern (center hole with two small alignment holes) – not an oval or star pattern. Measure your existing blade’s center hole diameter (typically 1 inch) and overall length (21 inches). Cross-reference your mower’s model number with OEM part numbers 406712 (Craftsman) or 189028 (Husqvarna). This blade is not compatible with zero-turn, riding, or 22-inch+ decks. Check your mower’s manual or current blade for these exact numbers before ordering.

Key Things to Know

• Quality: Aftermarket blade, typically made of hardened steel with a painted finish. It may be slightly thinner or lighter than OEM, but reviews indicate good durability for residential use.
• Installation: Moderate difficulty – you’ll need a socket wrench and a blade removal tool (or wood block to lock the blade). Torque bolts to 35-50 ft-lbs; overtightening can strip threads.
• Common Gotcha: The circle mounting pattern is less common on newer mowers. If your blade has a single center hole (no alignment holes), this won’t fit. Also, check that the blade’s air lift (curved ends) matches your deck’s discharge direction – installing backwards will reduce cutting performance.
• Balance: Always balance a new blade before mounting. An unbalanced blade causes vibration, uneven cut, and can damage the spindle.

Should You Buy It

If you have a 21-inch Craftsman or Husqvarna push mower with a circle mounting pattern and want a budget-friendly replacement that performs well for regular lawn care, this is a solid choice. It’s not for heavy-duty commercial use or odd-sized decks, but for homeowners, it delivers reliable cuts at a lower price than OEM.