21 Inch Lawn Mower Blade - Mulching Blade for Cub Cade MTD Craftsman Troy Bilt TB110 TB200 Some 21" Walk Behind Push Mower Replace Parts 942-0741A 742-0741A CMXGZAM100067

What It Is

This is a 21-inch mulching blade designed to replace OEM part numbers 942-0741A, 742-0741A, and CMXGZAM100067. It fits select Cub Cadet, MTD, Craftsman, and Troy-Bilt 21-inch walk-behind push mowers, including the TB110 and TB200 series. The blade’s curved, high-lift design cuts grass into fine clippings that are recirculated into the lawn for natural fertilization.

Fitment & Compatibility

Before buying, confirm your mower has a 21-inch cutting deck—measure from blade tip to blade tip (not the deck shell). This blade replaces OEM numbers 942-0741A, 742-0741A, and CMXGZAM100067. It fits many MTD-built models (Cub Cadet SC100/SC300, Craftsman 37400/37500, Troy-Bilt TB110/TB200) but not all 21-inch decks—check your mower’s model number against the manufacturer’s compatibility list. Measure the blade’s center hole diameter (must be 1-inch) and the distance between mounting holes (typically 2.75 inches on center for most MTD spindles). Avoid assuming “21-inch” means universal fit; blade offset, sail height, and air-lift shape vary by brand.

Key Things to Buy

• Quality: Made from hardened steel with a protective coating to resist rust. Reviews note it stays sharp longer than some budget blades but may require balancing out of the box.
• Installation difficulty: Moderate. You’ll need a socket wrench, torque wrench (recommended 35-50 ft-lbs), and patience to center the blade on the spindle. Always disconnect the spark plug first.
• Common gotchas: The blade’s mulching design reduces bagging efficiency—if you prefer bagging, consider a standard lift blade. Also, the 21-inch length can be tight on some decks; measure twice before ordering.
• Maintenance: Sharpen or replace every 25 hours of use or when the blade chips. Check the blade’s balance after each sharpening to avoid vibration.

Should You Buy It

Yes, if you own a compatible MTD-based 21-inch mower and want to mulch clippings instead of bagging or side-discharging. At $18.99 with solid reviews, it’s a reliable, affordable replacement that improves lawn health. Skip it if you need a bagging blade or have a non-MTD deck (e.g., Honda, Toro, or Husqvarna).