Toro Part # 133-8181-03 Blade 20 Inch

What It Is

The Toro Part # 133-8181-03 is a 20-inch OEM replacement blade designed for Toro walk-behind mowers. It’s a standard lift blade for general residential grass cutting, not for mulching or bagging.

Fitment & Compatibility

This blade fits Toro mowers with a 20-inch cutting deck and a 5-point star center hole (requires a specific star-shaped adapter, not a standard round hole). Common compatible models include the Toro Recycler (e.g., 20334, 20339) and TimeCutter (e.g., 74710, 74711) series. Before buying: measure your current blade’s length from tip to tip (must be exactly 20 inches) and confirm your mower’s deck model number (stamped under the deck or in the manual). This is an OEM part—aftermarket alternatives (e.g., Oregon, Stens) may fit but require verifying the star pattern and offset (this blade has a 0.75-inch offset for standard lift). Not for 21-inch or 22-inch decks.

Key Things to Know

• Quality: OEM Toro blade—good steel, balanced from factory, but edge dulls faster than high-carbon aftermarket options.
• Installation: Requires a 5/8-inch socket or wrench; torque to 35-50 ft-lbs. The star center hole can be tricky to align—use a blade removal tool or wedge to lock the blade.
• Common Gotcha: The star pattern is not universal—aftermarket “universal” blades often don’t fit without an adapter ring. Stick with OEM for guaranteed fit.
• Maintenance: Sharpen every 10-15 hours of use; replace if bent or nicked deeper than 1/8 inch.

Should You Buy It

Buy this if you own a Toro 20-inch mower with a star-center blade mount and want a direct, hassle-free OEM replacement. It’s a safe choice for average homeowners who value fitment over cutting longevity. Skip it if you have a 21-inch deck, want a mulching blade, or prefer a cheaper aftermarket option (but verify compatibility first).