CUB CADET 490-110-F115 42" Mulching Blade Set Star Mount RZT LTX LT EFI 1170 42 1600 ZT1 XT2 XT1 SX42 GW- CMXGZAM110115

What It Is

This is a set of three 42-inch mulching blades designed for select Cub Cadet zero-turn and lawn tractors with a star-shaped spindle mount. They are meant to replace worn OEM blades on decks that require a 3-blade mulching setup, cutting grass into fine clippings for nutrient recycling.

Fitment & Compatibility

Before buying, verify three things: deck size (must be exactly 42 inches), spindle mount type (this uses a 5-point star pattern, common on Cub Cadet RZT, LTX, and ZT1 series), and blade shape (mulching blade with a high-lift, curved design). This set fits models like the RZT 1170, LTX 1040, LTX 1045, LTX 1046, LTX 1047, LTX 1050, ZT1 42, ZT1 50, XT1, XT2, SX42, and GW- CMXGZAM110115. Do not assume fit if your deck is 46 or 50 inches—this is only for 42-inch models. Check your owner’s manual or measure your current blade length (should be ~20.5 inches each) and verify the star pattern; a standard 5-point star is not the same as a 3-hole or oval mount. OEM part number is 490-110-F115.

Key Things to Buy

• Quality: OEM-grade steel with a hardened edge; holds an edge longer than cheap aftermarket blades but may dull faster in sandy or rocky soil.
• Installation difficulty: Moderate. You’ll need a socket or wrench for the center bolt (usually 5/8-inch) and a block of wood to jam the blade. Torque to 40-50 ft-lbs. No special tools required.
• Mulching performance: Works best with dry grass; wet or thick grass may clump or require slower mowing. Not designed for bagging or side discharge—use only for mulching.
• Common gotcha: The star mount can strip if the bolt is over-tightened or the blade is installed upside down. Always replace the center bolt if it’s worn or rusted.

Should You Buy It

If you own a compatible 42-inch Cub Cadet with a star spindle and want OEM-quality mulching blades that will fit perfectly without modification, this set is a direct replacement. It’s priced about average for OEM blades—fine for most homeowners, but if you mow heavy or commercial use, consider a higher-end aftermarket option. For occasional mulching on a residential lawn, it’s a solid, straightforward buy.