8TEN LawnRAZOR Blade for Toro TimeCutter SW4200 ZS4200S ZS4200T 131-3938-03 42 Inch Deck (Toothed Mulching) 2 Pack

What It Is

The 8TEN LawnRAZOR Toothed Mulching Blade is a direct-replacement aftermarket blade set (2-pack) designed for Toro TimeCutter zero-turn mowers with a 42-inch deck, specifically the SW4200, ZS4200S, and ZS4200T models. Its toothed edge is optimized for fine mulching—chopping clippings into tiny particles that decompose quickly.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Must be a 42-inch deck. Measure center-to-center on your blade mounting holes—this blade uses a 5-point star center hole pattern (common on Toro TimeCutter).
• Model match: Confirmed fit for Toro TimeCutter SW4200, ZS4200S, and ZS4200T. Also fits other Toro 42" decks using OEM blade part #131-3938-03. Not compatible with 50" or 60" decks.
• OEM vs aftermarket: This is an 8TEN aftermarket blade, not genuine Toro. It matches OEM dimensions (blade length ~20.5”, thickness ~0.2”) but may have slight weight or balance differences. Always check blade balance before install.

Key Things to Know

• Mulching vs bagging: Toothed blades create finer clippings for mulching but can clog if you try to bag wet grass—use standard lift blades for bagging.
• Installation difficulty: Easy—just a socket and torque wrench (35-50 ft-lbs). But you must re-check blade balance; aftermarket blades sometimes require light grinding to balance.
• Durability: 8TEN uses heat-treated steel, but reviews note edge life is shorter than OEM—expect sharpening after 10-15 hours of use on tough turf.
• Common gotcha: The 5-point star center hole fits Toro’s spindle, but if your mower has a different pattern (e.g., oval or keyhole), it won’t mount.

Should You Buy It

If you own a Toro TimeCutter with a 42-inch deck and want fine mulching without paying OEM prices, this is a solid budget pick. It’s not for heavy commercial use or bagging—stick to OEM if you need longer edge life or consistent bagging performance. For light-to-moderate residential mulching, it’s a good value at $33.95 for two blades.