Toro Part # 20120P Blade Kit Replaces 120-9500-03 Timemaster Blades

What It Is

The Toro Part # 20120P Blade Kit is a three-blade set designed for Toro Timemaster walk-behind mowers with 30-inch decks. It replaces the older OEM part number 120-9500-03 and is intended for cutting grass, not heavy mulching or bagging.

Fitment & Compatibility

Before buying, confirm your Toro Timemaster model has a 30-inch deck (not 22-inch or 42-inch). This kit fits all Timemaster models using the original 120-9500-03 blade, including models 20330, 20331, 20332, 20333, 20334, and 20340. Measure your existing blade length—these are 16.5 inches long with a 1-inch center hole and a 0.25-inch thickness. If your blades are shorter, wider, or have a different hole size, this kit won’t fit. Always verify your mower’s model number on the frame or under the seat; the blade kit is OEM Toro, not aftermarket.

Key Things to Buy

• Quality: Toro OEM blades are heat-treated, hardened steel. They stay sharp longer than cheap aftermarket alternatives but cost more.
• Installation: Easy—lift deck, remove three bolts, swap blades, torque to 40-50 ft-lbs. Use a blade stop tool or block wood to prevent spinning.
• Common gotcha: The blades are directional. The stamped “Toro” or part number must face up toward the deck. Installing upside down reduces cut quality and can cause vibration.
• Durability: Expect 20-30 hours of mowing before noticeable dulling. Sharpen, don’t replace, until they’re under 2 inches wide or bent.

Should You Buy It

Buy this if you own a 30-inch Toro Timemaster and want guaranteed fit, reliable OEM quality, and hassle-free replacement. It’s the right choice for maintaining factory cut performance and avoiding compatibility issues with aftermarket blades. Skip it only if you need a cheaper alternative or a different blade type (mulching, high-lift).