108-3766-03 Blade Support - 125-2466 105-8579 Blade Bolt, Fits for Commercial 21 ECS180GKA21000 S X Series Compatible with Toro Walk Behind Mower 20001, 20003, 20005, 20067, 20069, 20070

What It Is

This is a genuine Toro blade support (part #108-3766-03) paired with the correct blade bolt (125-2466 / 105-8579) for securing the blade to the spindle. It’s designed for commercial-duty Toro walk-behind mowers and is commonly used in high-hour landscaping or turf maintenance.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This support fits Toro Commercial 21” walk-behinds, including models 20001, 20003, 20005, 20067, 20069, and 20070. It also works with the ECS180GKA21000 and S Series. The support is OEM Toro, not aftermarket—so no guesswork on fit. Measure your existing support’s outer diameter and center hole size (typically 1” OD with a 5/8” center hole). The bolt is a 5/16”-24 thread, 1-1/8” long. If your deck is a 21” Toro commercial with a standard spindle, this is the right pair. Not for residential or 22”+ decks.

Key Things to Know

• Quality: Genuine Toro cast steel—holds up better than stamped aftermarket supports under heavy use.
• Installation: Easy bolt-on; use thread locker (blue Loctite) and torque to 35-45 ft-lbs. Don’t over-tighten or you’ll strip the spindle threads.
• Common gotcha: The bolt included is a one-time-use stretch bolt. Replace it every time you remove the blade—reusing it risks failure.
• Check your spindle: If the spindle shaft is worn or bent, this support won’t fix a wobble. Inspect before installing.

Should You Buy It

If you own a Toro 21” commercial walk-behind and need a direct OEM replacement for a worn or damaged blade support, this is the right choice. It’s inexpensive, includes the correct bolt, and has near-perfect reviews. Skip it if you have a residential Toro or a different deck size—fitment is strictly for the models listed.