Troy-Bilt Mower Blade MTD 42 INCH Length 490-110-Y115/M115

What It Is

This is a 42-inch OEM replacement blade set for Troy-Bilt riding mowers, designed to cut grass efficiently on medium-to-large lawns. It’s a direct factory replacement for the 490-110-Y115 and M115 part numbers, intended for use with Troy-Bilt tractors and zero-turn mowers with a 42-inch cutting deck.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: Your mower must have a 42-inch deck. Measure from blade tip to blade tip across the deck if unsure.
• Model fit: This blade fits specific Troy-Bilt models (e.g., Pony, Bronco, Mustang series with 42-inch decks) and some MTD-built units. Check your owner’s manual or existing blade part number against 490-110-Y115/M115.
• Measurements: Blade length is exactly 42 inches (center hole to tip). Center hole diameter is usually 1-inch (some models use 7/8-inch—measure yours). Verify the center hole and spindle pattern match your mower. This is an OEM part, so aftermarket brands may differ slightly.

What to check: Remove one existing blade and compare length, hole size, and thickness. If your mower uses a different part number (e.g., 490-110-Y116), this won’t fit.

Key Things to Know

• Quality: OEM construction with hardened steel and balanced design. Should last 1-2 seasons on normal use (replace sooner if hitting rocks or roots). Dull blades tear grass, causing browning.
• Installation difficulty: Moderate. You’ll need a socket wrench and a blade removal tool (or block of wood to stop blade spin). Torque bolts to 70-90 ft-lbs. Always disconnect spark plug first.
• Common gotchas: The 42-inch length means two blades (21 inches each). Don’t buy just one. Also, check for deck strike—if your mower deck is bent or misaligned, a new blade may contact the deck.
• Sharpening: Can sharpen 2-3 times, but OEM blades are relatively inexpensive; replacing is often faster and safer than balancing after sharpening.

Should You Buy It

If you own a Troy-Bilt 42-inch riding mower and want a guaranteed fit without measuring aftermarket options, this OEM blade is a safe, no-hassle choice. It’s priced higher than generic blades but avoids fitment headaches. Best for owners who prefer factory parts and want reliable cutting performance for a season or two.