New Stens Blade Adapter 400-320 Compatible with Toro Recyclers, 2002 and newer 104-8687, 104-8695, 106-3987

What It Is

The Stens Blade Adapter 400-320 is a replacement drive adapter that connects the mower blade to the crankshaft on Toro Recycler walk-behind mowers. It’s designed for 2002 and newer models, ensuring the blade spins correctly for cutting and discharge.

Fitment & Compatibility

Before buying, confirm your mower is a Toro Recycler model built in 2002 or later. This adapter replaces OEM part numbers 104-8687, 104-8695, and 106-3987. Measure the crankshaft diameter—this adapter fits a 7/8-inch shaft with a 5/16-inch keyway. Check your deck size; it’s compatible with most 21-inch and 22-inch Recycler decks, but verify your specific model number on the Stens cross-reference list or Toro’s parts site. If your mower has a different shaft size or an older Recycler (pre-2002), this won’t fit.

Key Things to Buy

• Quality: Stens is a reputable aftermarket brand, but this adapter may have slightly looser tolerances than OEM. Inspect for burrs or rough edges before installation.
• Installation: Moderate difficulty. You’ll need a socket set and torque wrench—tighten to manufacturer specs (typically 55-65 ft-lbs). Use a thread locker on the bolt to prevent loosening.
• Common Gotchas: The adapter’s keyway slot may need filing for a snug fit with the key. Ensure the blade sits flat; a warped adapter can cause vibration. Check the old adapter for wear—if the bolt hole is stripped, replace it.
• Price vs. OEM: At $29.99, it’s cheaper than Toro’s OEM part (often $40+). If you’re on a budget and don’t mind potential fit adjustments, this is a solid value.

Should You Buy It

Buy this Stens adapter if you own a 2002+ Toro Recycler and need a cost-effective replacement for a worn or damaged OEM adapter. It’s a good choice for DIYers comfortable with minor fitment tweaks (like filing the keyway) and who want to save about $10–15 over OEM. If you prefer a perfect drop-in fit with zero hassle, stick with the genuine Toro part.