8TEN LawnRAZOR High Lift Blade 21 inch Deck for MTD Cub Cadet Troy-Bilt SC100 SC300 Tuff-Cut 220 742-0641 942-0641

What It Is

The 8TEN LawnRAZOR High Lift Blade is a 21-inch replacement blade designed for walk-behind mowers from MTD, Cub Cadet, Troy-Bilt, and other brands using the SC100, SC300, and Tuff-Cut 220 series. Its high-lift design increases airflow under the deck for better bagging performance and improved grass clipping discharge.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 21 inches (measure the blade tip-to-tip, not the deck housing). This blade replaces OEM part numbers 742-0641 and 942-0641. It fits MTD, Cub Cadet, Troy-Bilt, Yard Machines, and Yard Man models with a 21-inch deck, including SC100, SC300, Tuff-Cut 220, and similar push mowers. The center hole is a standard 5-point star (1-inch diameter), and the blade measures 3/8 inch thick. Check your mower’s model number (usually under the seat or on the deck) to verify compatibility—do not rely solely on brand name.

Key Things to Know

• High lift = better bagging, more power draw: The aggressive lift can strain small engines (under 140cc) or cause clumping in wet grass. Use only for dry, tall grass or heavy mulching.
• Installation is straightforward but requires torque: Use a torque wrench to tighten the blade bolt to 30-40 ft-lbs. Over-tightening can strip the star center.
• Quality is good for the price: These blades are heat-treated steel, but they may dull faster than OEM premium blades. Expect to sharpen or replace every 2-3 seasons with regular use.
• Check deck clearance: High-lift blades sit slightly lower than standard blades. Ensure your mower deck has at least 1/4 inch clearance between the blade tip and the deck housing to avoid contact.

Should You Buy It

This is a solid budget-friendly upgrade if you primarily bag grass and have a compatible 21-inch MTD/Cub Cadet push mower. Avoid it if your engine is under 140cc (may bog down) or if you mow wet grass frequently—stick to a standard lift blade instead. For $21.95, it’s a reliable alternative to OEM parts for most homeowners.