CUB CADET 748-06644 Blade Adapter #6 X 1.19 W/S Lithium Ion ZT1 XT1 SCP21E LT42E 42E

What It Is

This is the OEM blade adapter (Cub Cadet part 748-06644) that connects the mower blade to the spindle shaft on select Cub Cadet zero-turn and riding mowers with 42-inch decks. It’s specifically designed for lithium-ion battery-powered models (e.g., ZT1 42E, XT1 LT42E) and some gas equivalents, ensuring the blade sits correctly and spins without wobble.

Fitment & Compatibility

Before buying, confirm your mower model and deck size. This adapter fits Cub Cadet models with a 42-inch deck that use a 6-point star spindle shaft (1.19-inch center hole) and a 1-inch blade center hole. Compatible models include: ZT1 42E, XT1 LT42E, SCP21E, and LT42E. It is not compatible with 46-inch or 54-inch decks, or models with a round or keyed shaft. Check your owner’s manual or remove the old adapter to verify the star pattern and shaft diameter. OEM part number is 748-06644; aftermarket equivalents may vary in fitment.

Key Things to Know

• Material & Build: OEM-grade cast iron, durable enough for residential use but not heavy commercial abuse. Lithium-ion models put less torque on it than gas, so wear is minimal.
• Installation: Simple swap—remove blade bolt, slide off old adapter, slide on new one, and torque blade bolt to 45–55 ft-lbs. No special tools needed beyond a socket wrench.
• Common Gotcha: The adapter’s star pattern must align perfectly with the spindle. If it’s loose or misaligned, the blade can vibrate or fly off. Double-check that the adapter isn’t cracked or warped before installing.
• Price vs. Aftermarket: At $15.95, it’s fairly priced for OEM. Cheaper knockoffs may have looser tolerances and can cause blade imbalance or premature spindle wear.

Should You Buy It

If you own a Cub Cadet 42-inch electric or gas mower from the ZT1 or XT1 series and need a direct replacement for a worn or damaged adapter, this is the right choice. It’s a simple, reliable OEM part that ensures safe blade operation. Skip it if you have a different deck size or a non-Cub Cadet mower—fitment is model-specific.