942-04308 942-04308A Mower Blades -2 Blades- High Lift fits for Troy BIlt Bronco Mustang Cub Cade RZT MTD Craftsman with 42" Cutting Deck Replaces 742-04308 742-04312

What It Is

This is a set of two high-lift mower blades designed to replace OEM parts 742-04308 and 742-04312. They are intended for 42-inch cutting decks on Troy-Bilt Bronco, Mustang, Cub Cadet RZT, MTD, and Craftsman lawn tractors, providing increased airflow for better grass clipping discharge and bagging performance.

Fitment & Compatibility

Before buying, confirm your deck is exactly 42 inches (measured blade tip to blade tip). These blades fit many MTD-built tractors, but verify your model number against the 942-04308/942-04308A part number. They replace OEM 742-04308 and 742-04312, but check your current blade’s center hole size (should be 1-inch diamond or 7/8-inch round) and overall length (typically 20.5 inches). Measure your old blade’s length, width, and thickness to ensure a match. Aftermarket blades may vary slightly in balance or thickness, so compare to your original.

Key Things to Know

• High lift vs. standard: High-lift blades create more suction, which improves bagging and side discharge but can reduce engine efficiency on thick grass. Not ideal for mulching unless paired with a mulching kit.
• Installation: Requires a torque wrench (40-50 ft-lbs) and thread locker. The blades are sharp—wear gloves. Ensure the blade’s “up” side faces the deck.
• Balance: Aftermarket blades may need balancing after installation. Use a blade balancer to avoid vibration that can damage spindle bearings.
• Deck compatibility: These only fit 42-inch decks. Do not use on 46-inch or larger decks. Check your deck’s spindle bolt pattern (usually 5/16-inch or 3/8-inch).

Should You Buy It

Buy these if you need a cost-effective replacement for your 42-inch MTD/Craftsman/Troy-Bilt deck and prioritize strong bagging or side discharge performance. Avoid if you primarily mulch or have a deck larger than 42 inches.