Maxpower

What It Is

The Maxpower 331557X is an aftermarket replacement blade set for 21-inch walk-behind mowers, designed to handle standard residential grass cutting and mulching tasks.

Fitment & Compatibility

• Deck size: Fits only 21-inch cutting decks—measure your deck width (blade tip to tip) before buying.
• Blade specs: 21-inch length, 0.25-inch center hole diameter, 3.5-inch star pattern (common for Craftsman, Husqvarna, Poulan, and many MTD/John Deere models).
• OEM cross-reference: Replaces OEM part numbers 331557X, 331557, and 331557A. Confirm your mower’s OEM blade part number online or in the manual.
• What to check: Measure your current blade’s length, center hole shape (star vs. oval), and ensure the blade adapter pattern matches. Not compatible with universal or offset hole blades.

Key Things to Know

• Quality: Medium-carbon steel, decent for average lawns but may dull faster than premium OEM blades on tough grass or debris.
• Installation: Easy—use a socket wrench and blade removal tool. Torque to 40-50 ft-lbs; overtightening can strip the adapter.
• Gotcha: The star pattern can be tight on some adapters; lightly file the hole if it’s too snug to avoid vibration.
• Balance: Out of the box, balance is acceptable but check with a balancer—unbalanced blades cause mower shake and uneven cut.

Should You Buy It

Buy it if you need a budget-friendly, direct replacement for a common 21-inch walk-behind mower and you’re comfortable checking fitment and balance yourself. Skip it if you need heavy-duty mulching, have a premium mower brand (e.g., Honda, Toro with non-star patterns), or want longer blade life—spend more on OEM or high-carbon steel instead.