Fismiuta 42-inch mower blades — 6-star center hole 42" mulching replacement, heat-treated boron steel for 42" decks

These Fismiuta 42-inch, 6-star center-hole mower blades (model 942-04308 / 942-04312) are heavy-duty replacement blades engineered for mulching, bagging, or side-discharge on compatible 42" decks using a 6-point star center hole.

If your riding mower uses a 42" deck with a 6-star center hole — commonly found on Cub Cadet XT1-42, ZT1-42, LT42, RZT42 and many Troy-Bilt and Craftsman models — these blades are built as an upgraded, drop-in replacement. Fismiuta designed them from 40MnB boron steel with full-body heat treatment to resist impact, hold a sharper edge longer, and maintain balance at high RPMs. Read on to check fit, key performance traits, and whether these blades match your mowing needs.

How do these blades improve cutting and mulching performance?

Fismiuta blades use a medium-lift aerodynamic profile that creates strong airflow under the deck, lifting grass upright for a cleaner cut and better mulching action. The sharpened, larger effective edge reduces tearing and promotes a uniform appearance across the lawn.

• Medium-lift design generates a vacuum vortex for upright grass feeding.
• Wider cutting area and enhanced edge retention for precise shearing.
• Optimized for mulching, bagging, or side discharge with improved bag fill.

Will these blades fit my mower and replace OEM numbers?

They are made to replace specific OEM part numbers for several 42" decks; verify your mower’s SKU or existing blade part number before purchasing. The Fismiuta 942-04308 series replaces many Cub Cadet, Troy-Bilt, Craftsman and Columbia 42" blade part numbers when the center hole is the 6-point star configuration.

• Compatible OEM replacements include: 742-04308, 742-04308A, 942-04308A, 942-04308, 742-04312, 942-04312, and related codes.
• Fits 42" decks from Cub Cadet XT1-42, ZT1-42, LT42, RZT42 and select Troy-Bilt/Craftsman models.
• Confirm your mower requires a 6-point star center hole before ordering.

How durable are these blades against impacts and rust?

Constructed from industrial-grade 40MnB boron steel with full-body heat treatment, these blades are engineered to resist shocks from hidden rocks or roots and to maintain structural integrity. A heavy-duty powder coat finish protects against corrosion, abrasive wear, and UV exposure for longer service life.

• Full-body heat treatment increases toughness and impact resistance by about 35% over low-end carbon steel blades.
• Powder coating provides enhanced rust and UV protection for seasonal durability.
• Digital dynamic balancing reduces vibration that can accelerate hub and spindle wear.

How do these blades affect vibration, motor wear, and maintenance needs?

Each blade is dynamically balanced to minimize high-speed wobble, which reduces noise and vibration transmitted to the deck and motor bearings. Cleaner cuts and improved balance help prevent premature wear to spindles and save time on re-trimming and resharpening.

• Digital dynamic balancing lowers vibration for smoother operation at full throttle.
• Sharper edge retention means less frequent sharpening or replacement.
• Reduced rotor imbalance helps protect spindles and mower drive components.

Who is this for: Homeowners and small property managers who use 42" riding mower decks with a 6-point star center hole and want a stronger, longer-lasting replacement blade for mulching, bagging, or side discharge. These blades suit users seeking a performance upgrade over basic carbon-steel replacements — especially those mowing uneven yards with hidden debris or who want cleaner cuts and reduced vibration for extended mower life.