Toro Part # 131-3939-03P Timecutter 42" Deck Blade Kit for 79220P SS4225 Mower

What It Is

The Toro Part # 131-3939-03P is an OEM 42-inch deck blade kit designed specifically for Toro Timecutter SS4225 (model 79220P) zero-turn mowers. It includes three blades that balance cutting performance with durability for residential lawn care.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: This kit is for 42-inch decks only. If your Timecutter has a 50-inch or 60-inch deck, this won’t fit.
• Model match: Confirmed fit for Toro Timecutter SS4225 (model 79220P). Also fits other Timecutter models with 42-inch decks (check your owner’s manual or current blade part number).
• OEM vs aftermarket: This is genuine Toro, not an aftermarket knockoff. Aftermarket blades may be cheaper but can differ in thickness, heat treatment, or balance—leading to uneven cuts or vibration.
• Measurements: Each blade is approximately 16.5 inches long with a 1-inch center hole and 1/4-inch thickness. Measure your existing blades to confirm.

Key Things to Know

• Quality: OEM blades are precision-balanced and heat-treated for longer edge retention. Expect 25–50 hours of cutting life depending on grass conditions.
• Installation difficulty: Easy—requires a socket wrench and jack/ramp to lift the mower. Torque bolts to 70–90 ft-lbs. Mark blade orientation before removal.
• Common gotcha: The kit includes three blades, but some aftermarket listings sell single blades. This is a full set, so you won’t need to buy extras.
• Sharpness: Blades come factory-sharpened but not razor-sharp. They’ll dull faster if you hit rocks, roots, or thick weeds.

Should You Buy It

If you own a Toro Timecutter SS4225 or compatible 42-inch deck model and want a guaranteed fit with OEM durability, this kit is the right choice. It’s priced fairly for a genuine Toro set and has strong user feedback. Skip it if you’re looking for a budget aftermarket option or if your deck size differs.