SCITOO 2pcs 42 Inches Deck Mower Blades for MTD for Cub Cadet for Troy-Bilt Replaces OEM 742-04308 742-04312 942-04308 942-04312 119-8456

What It Is

This is a set of two 42-inch replacement mower blades designed for mid-size lawn tractors and zero-turn mowers from MTD, Cub Cadet, and Troy-Bilt. They are intended for cutting grass on residential or light commercial properties with 42-inch decks.

Fitment & Compatibility

Before buying, verify these four things:

• Deck size: Only fits 42-inch (107 cm) cutting decks. Measure your deck width from blade tip to blade tip.
• Brand/model: Works with MTD, Cub Cadet, and Troy-Bilt models using a center hole and oval drive pattern. Check your owner’s manual or current blade for the pattern.
• OEM part numbers: Replaces OEM 742-04308, 742-04312, 942-04308, 942-04312, and 119-8456. If your blade has one of these numbers stamped on it, these will fit.
• Measurements: Each blade is 21 inches long (since two cover 42 inches), with a 1-inch center hole and a 5/8-inch oval drive. Confirm your existing blade matches these dimensions.

Critical check: Not all 42-inch decks use the same blade pattern. If your current blade has a different center hole shape or drive slot, these will not fit.

Key Things to Know

• Quality: These are aftermarket blades, not OEM. They are made from hardened steel but may not hold an edge as long as factory Cub Cadet or MTD blades. Expect to sharpen or replace more frequently under heavy use.
• Installation: Easy to install with basic hand tools (socket wrench, torque wrench recommended). Torque blade bolts to 55-65 ft-lbs. Use a blade removal tool or block the blade to prevent rotation. Always disconnect the spark plug first.
• Balance: Aftermarket blades sometimes require balancing. Use a blade balancer and file the heavy side if needed. An unbalanced blade causes vibration, poor cut, and bearing wear.
• Gotcha: These blades are sold as a pair, but some 42-inch decks use different blade lengths or patterns for left vs. right. Verify both blades are identical before buying.

Should You Buy It

Buy these if you need a budget-friendly, quick replacement for a 42-inch MTD, Cub Cadet, or Troy-Bilt mower and you’re comfortable with occasional sharpening and balancing. Skip them if you want OEM-level durability or have a deck that uses a non-standard blade pattern. At $18.35 for a pair, they’re a solid value for light to medium use.