Rotary 3 3401 Mower Blades Bobcat 112111-02 Gravely 03253800 36" 52" 54" Deck

What It Is

This is a set of three replacement mower blades designed for zero-turn and commercial riding mowers with 36-inch, 52-inch, or 54-inch cutting decks. They are aftermarket equivalents for OEM part numbers Bobcat 112111-02 and Gravely 03253800, suited for heavy-duty grass cutting on residential or commercial turf.

Fitment & Compatibility

Before buying, measure your existing blades to confirm fit. These Rotary 3 3401 blades have a length of 18 inches (457 mm), a center hole diameter of 3/4 inch (19 mm), and a thickness of 0.25 inch (6.4 mm). They fit Bobcat zero-turn mowers (e.g., ZT series with 52" or 54" decks) and Gravely commercial mowers (e.g., Pro-Turn series with 36", 52", or 54" decks). Verify your deck model number and spindle pattern: these are a 3-blade set, so ensure your deck uses three blades. Cross-check with OEM part numbers Bobcat 112111-02 or Gravely 03253800. Not for residential push mowers or decks smaller than 36 inches.

Key Things to Know

• Quality: Made from heat-treated steel with a hardened edge, these blades are durable for regular mowing but may wear faster than OEM on sandy or rocky terrain. They are not mulching blades—use for standard side-discharge or bagging.
• Installation: Moderate difficulty. You’ll need a socket wrench and a blade removal tool (or block of wood to hold the blade). Torque spindle bolts to 70-90 ft-lbs. Always lift the deck or disconnect the spark plug before starting.
• Common Gotchas: The 18-inch length is critical—measure your current blades’ center-to-center distance to avoid interference with the deck shell. Some users report the center hole fits slightly tighter than OEM; if so, file the hole lightly. Replace all three blades at once to maintain balance.
• Maintenance: Sharpen after 10-15 hours of use. Check for bends or cracks after hitting obstacles—replace immediately if damaged.

Should You Buy It

If you need a reliable, budget-friendly alternative to OEM blades for Bobcat or Gravely zero-turn mowers with a 36", 52", or 54" deck, this set is a solid choice. It’s best for homeowners or light commercial users who want good cutting performance without paying premium OEM prices. Avoid if you need mulching blades or if your deck uses non-standard bolt patterns or lengths.