Genuine OEM Toro Part # 137-1999-03 Blade; Fits 2017 & Newer Toro Timecutter 42" Mowers

What It Is

The Genuine OEM Toro Part # 137-1999-03 is a 16.25-inch, high-lift replacement blade designed specifically for 2017 and newer Toro Timecutter 42-inch zero-turn mowers. It provides a clean, even cut and improved bagging performance for residential and light commercial use.

Fitment & Compatibility

• Deck Size: Fits only 42-inch cutting decks. Do not use on 44-inch, 50-inch, or 60-inch decks.
• Model Range: Compatible with all Toro Timecutter 42" models (e.g., SS4225, SS4235, MX4250, MyRIDE) manufactured from 2017 onward. Check your mower’s serial number or model tag under the seat.
• OEM vs Aftermarket: This is a genuine Toro part—guaranteed bolt pattern and thickness. Aftermarket blades may have different hole sizes or offset, causing vibration or poor cut.
• Measurements: Blade length is 16.25 inches, center hole diameter 0.75 inches, and thickness 0.1875 inches. Confirm your current blade matches these specs.
• Quantity: Sold individually. You need three blades for a full set on a 42-inch deck.

Key Things to Know

• Installation Difficulty: Easy—requires a socket wrench (typically 5/8-inch or 15/16-inch) and a block of wood to lock the blade. No special tools needed.
• Common Gotcha: The blade has a specific orientation; the “high-lift” curved side must face upward toward the deck. Installing upside down will cause poor cut and excessive vibration.
• Quality: OEM blades are heat-treated and balanced from the factory. Aftermarket blades often lack this precision and may wear faster or create uneven cutting.
• Maintenance: Replace every 25-30 hours of use or when the cutting edge is dull or nicked. Sharpening is possible but reduces blade life.

Should You Buy It

Buy this if you own a 2017+ Toro Timecutter 42" and want a direct, no-guesswork replacement that maintains factory cut quality and bagging performance. It’s ideal for homeowners who prioritize reliability over saving a few dollars on aftermarket blades. If your deck is a different size or older model, confirm fitment first.