CRAFTSMAN CMXGZAM100129 21-Inch AYP/HOP Mulch OE#532-406712 Blade, Black

What It Is

This is a 21-inch mulching blade designed for Craftsman, AYP (American Yard Products), and Husqvarna (HOP) mowers. It replaces OEM part #532-406712 (and its cross-reference #406712) and is meant for cutting grass and finely chopping clippings to recycle nutrients back into the lawn.

Fitment & Compatibility

• Deck size: Only fits 21-inch cutting decks. Measure your blade length (tip to tip) – it must be exactly 21 inches. Center hole is typically 5/8" round, but confirm your spindle’s shape (some use a star or diamond pattern).
• Model/brand fit: Works with many Craftsman, Husqvarna, Poulan, and AYP mowers from the 2000s onward. Check your mower’s model number against the OEM #532-406712 in the manual or online parts lookup.
• OEM vs aftermarket: This is an OEM-style Craftsman replacement, not a generic blade. It’s made to original specs, so it should match bolt pattern, lift, and balance without modification.
• What to check: Verify your mower uses a single 21-inch blade (not a multi-blade system). Also note the blade’s center hole shape and thickness (usually 0.125–0.150 in.) – measure yours if unsure.

Key Things to Know

• Mulching performance: The curved, multi-wing design creates better lift and finer clippings than standard straight blades. Works best with a mulching plug installed and dry grass.
• Installation: Relatively easy – use a socket and torque wrench (recommended torque: 40-50 ft-lbs). Always disconnect the spark plug first. The blade is symmetrical, so no “up” or “down” orientation.
• Durability: Heat-treated steel holds an edge decently, but you’ll still need to sharpen every 20-25 hours of use. Avoid hitting rocks or roots to prevent bending.
• Common gotcha: If your mower has a different center hole shape (e.g., 7-point star), this blade won’t fit. Double-check before buying or consider a universal adapter.

Should You Buy It

If you have a 21-inch Craftsman or AYP mower and want genuine OEM mulching performance without fussing with aftermarket fitment, this is a solid, reliable choice. It’s best for homeowners who mow weekly and prioritize fine mulching over bagging. Skip it if you need a bagging or side-discharge blade, or if your deck uses a non-standard center hole.