CUB CADET 942-0616A 21.23" Mulching Blade RZT42 XT1-LT42 ZT1-42 42" Deck Mowers

What It Is

This is a genuine OEM Cub Cadet 21.23-inch mulching blade (part 942-0616A) designed for 42-inch deck tractors, including the RZT42, XT1-LT42, and ZT1-42 models. It’s intended for mulching grass clippings into fine particles that decompose quickly, reducing bagging needs.

Fitment & Compatibility

• Deck size: Only for 42-inch cutting decks—not for 46”, 50”, or 54” decks.
• Model fit: Fits Cub Cadet RZT42, XT1-LT42, ZT1-42, and also the LT42, GT42, and SC42 series. Check your owner’s manual or existing blade part number.
• OEM vs aftermarket: This is a genuine Cub Cadet part, not a generic replacement. Aftermarket blades may vary in thickness, balance, and hole alignment—stick with OEM for guaranteed fit.
• Measurements: Blade length is 21.23 inches (center hole to tip). Center hole diameter is 0.75 inches. Verify your current blade matches these specs before ordering.

Key Things to Know

• Sharpness out of box: Blades come sharp but not razor-fine. A quick file touch-up before first use can improve cut quality.
• Installation difficulty: Easy—requires a socket wrench and a block of wood to lock the blade. Torque to 60-70 ft-lbs. Use thread locker on the bolt if it’s loose.
• Common gotcha: Mulching blades work best with a mulching plug installed (if your deck has one) and when mowing dry grass at a slower ground speed. Wet or tall grass will clump.
• Balance: OEM blades are typically well-balanced, but check with a blade balancer after sharpening to avoid vibration.

Should You Buy It

If you own a Cub Cadet 42-inch deck tractor and want a reliable, direct-fit mulching blade that delivers fine clippings with minimal effort, this is the right choice. It’s more expensive than generic blades, but the OEM fit and consistent quality justify the price for users who mow frequently and want a clean, mulched finish.