UDC Parts 942-05052A 6 Point Star Mower Blades Replacement for Cub Cadet 50 Inch XT1 LT50 GT50 RZT SX50 Troy Bilt Mustang XP Craftsman Z550 T260 742-05052A Ultima ZT1-50 / Medium Lift Mulching 3 Pack

What It Is

This is a set of three 50-inch medium-lift mulching blades designed for zero-turn and lawn tractors from Cub Cadet, Troy-Bilt, and Craftsman. Each blade uses a 6-point star center hole and measures roughly 16.5 inches long, meant to replace OEM part 742-05052A.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 50 inches and uses a 6-point star spindle (not a 5-point or oval hole). Compatible models include Cub Cadet XT1 LT50, GT50, RZT SX50, Ultima ZT1-50; Troy-Bilt Mustang XP 50; and Craftsman Z550, T260. Also fits some Roper and Husqvarna 50-inch decks with the same star pattern. Measure your existing blade length (end to end) and center hole shape. If your deck uses a different spindle mount (e.g., 5-point star or keyed shaft), these will not fit.

Key Things to Know

• Medium lift vs. high lift: These provide good mulching and bagging performance but less vacuum than high-lift blades. Expect slightly less discharge power in wet grass.
• Sharpening: Blades are heat-treated steel and can be sharpened 2–3 times before replacement. Check balance after each sharpening.
• Installation: Use a torque wrench set to 70–90 ft-lbs. Reverse threads are common on some Cub Cadet spindles—verify rotation direction before tightening.
• Common gotcha: The 3-pack covers one 50-inch deck. If your mower has a different deck width (48 or 54 inches), these will not fit.

Should You Buy It

Yes, if you need affordable, direct-fit replacement blades for a 50-inch Cub Cadet, Troy-Bilt, or Craftsman with a 6-point star spindle and prefer mulching over high-vacuum bagging. Not ideal for wet, heavy grass or if your deck uses a different spindle pattern.