131-3938-03 Lawn Mower Blades for 42" Deck, Compatible with Toro TimeCutter SW4200 SS4220 SS4225 ZS4200S ZS4200T ZX4275T MX4275T 131-4182 131-4183 131-7708 131-7709, 2 Pack

What It Is

This is a 2-pack of OEM-style replacement blades for 42-inch Toro TimeCutter zero-turn mowers. Designed for medium-duty residential mowing, they cut and mulch grass clippings efficiently.

Fitment & Compatibility

Before buying, verify your mower has a 42-inch cutting deck—measure deck width if unsure. These blades fit specific Toro TimeCutter models: SW4200, SS4220, SS4225, ZS4200S, ZS4200T, ZX4275T, and MX4275T. They replace OEM part numbers 131-4182, 131-4183, 131-7708, and 131-7709. Blade length is approximately 20.5 inches with a 1-inch center hole and 1/2-inch offset. Cross-check your existing blade measurements—center hole diameter and overall length—to confirm match. Aftermarket equivalents may vary slightly; stick with these listed models for guaranteed fit.

Key Things to Know

• Quality: OEM-grade steel with hardened edge; lasts a season under normal residential use. Not for heavy commercial or rocky terrain.
• Installation: Straightforward with basic tools (socket wrench and torque wrench). Torque blade bolts to 60-70 ft-lbs. Use a blade lock or block to prevent rotation.
• Gotcha: Deck must be level before installing to ensure even cut. Check spindle condition—worn spindles can cause wobble even with new blades.
• Balance: Each blade is pre-balanced; still verify with a blade balancer after sharpening to avoid vibration.

Should You Buy It

If you own one of the listed Toro TimeCutter 42-inch models and want a direct-fit, no-fuss replacement, this 2-pack is a solid choice. It’s priced reasonably for OEM-grade blades and works well for routine residential mowing. Avoid if you need a universal blade or have a different deck size.