8TEN LawnRAZOR Blade Set for Exmark Quest QST20BE422 42 Inch Deck 109-9982 (Notched High Lift) 2 Pack

What It Is

The 8TEN LawnRAZOR Blade Set is a notched high-lift replacement blade pair designed for the Exmark Quest QST20BE422 with a 42-inch cutting deck. These blades are optimized for enhanced grass lift and bagging performance in residential/commercial zero-turn mowers.

Fitment & Compatibility

• Exact fit: Exmark Quest QST20BE422 (42” deck) and similar Exmark models using OEM part 109-9982.
• Measure before buying: Blade length must be 21 inches (center hole to tip), width ~2.5 inches, center hole diameter 1 inch, and notch spacing matches OEM.
• Cross-check: Fits Exmark Lazer Z, Radius, and Avenger models with 42” deck and 109-9982 part number. Verify your deck model number (e.g., 42-5560) and blade spindle bolt size (typically 5/8” or 3/4”).
• Aftermarket note: Not OEM Exmark, but built to OEM specs. Confirm your deck uses two blades, not three.

Key Things to Know

• High-lift design: Provides superior grass lift for bagging and mulching, but increases engine load and may throw debris—use with caution near gravel or fragile landscaping.
• Installation: Medium difficulty. You’ll need a socket wrench, torque wrench (recommended 70-80 ft-lbs), and blade removal tool. Always install with the notch facing upward toward the deck.
• Sharpness: Pre-sharpened but may need a quick hone for optimal cut. Replace both blades at the same time (sold as 2-pack).
• Durability: Heat-treated steel resists bending, but notched blades can chip if hitting rocks or roots. Check deck for bent spindles if blades don’t sit flat.

Should You Buy It

Buy this if you own an Exmark Quest QST20BE422 (or compatible 42” deck model) and need a reliable aftermarket alternative to OEM 109-9982 that improves bagging performance. It’s ideal for homeowners who prioritize clean clippings and don’t mind slightly higher engine effort. Avoid if you have a 48”+ deck or need standard lift blades for flat terrain.