SINTIKI 21 Inch Mulching Blade 942-0640 742-0640 for MTD Cub Cadet Troy-Bilt Lawn Mower, Heavy Duty Replacement Blade

What It Is

This is a 21-inch mulching blade designed to replace OEM part numbers 942-0640 and 742-0640. It fits select MTD, Cub Cadet, and Troy-Bilt walk-behind mowers with 21-inch cutting decks, optimized for fine grass clipping recycling rather than bagging or side discharge.

Fitment & Compatibility

Before buying, verify your mower’s deck size is exactly 21 inches (measure center-to-center of blade mounting holes). This blade is aftermarket, not OEM, so it works as a direct replacement for models using 942-0640 or 742-0640, including many Cub Cadet SC series, Troy-Bilt TB series, and MTD push mowers. Check your mower’s model number (often under the seat or on the deck) against SINTIKI’s compatibility list. The blade uses a standard 1-inch center hole and 5-point star drive – confirm your mower’s spindle matches. Avoid assuming fitment for older or non-standard deck shapes.

Key Things to Know

• Material quality: Heavy-duty steel, but not premium hardened – expect decent durability for residential use, not commercial.
• Installation difficulty: Easy if you have a socket wrench and blade removal tool; torque to 30-40 ft-lbs. Use thread locker if bolts are reused.
• Mulching performance: Lift is adequate for dry grass, but may struggle with thick, wet clumps. Keep blades sharp for best results.
• Common gotcha: The blade is slightly thicker than OEM in some reviews – ensure your mower’s blade bolt isn’t too short to engage threads fully.

Should You Buy It

Buy this if you need a reliable, budget-friendly mulching blade for a compatible 21-inch MTD/Cub Cadet/Troy-Bilt mower and don’t mind slightly thicker steel. Skip it if you mow heavy, damp grass regularly or want OEM fitment peace of mind – consider a genuine Cub Cadet blade instead.