Rotary 50" 11479 Aftermarket Replacement Lawn Mower Blade Set - 3 Blades

What It Is

This is a set of three aftermarket replacement blades for 50-inch cutting deck lawn mowers, designed for residential or light commercial use. The Rotary 11479 blades are intended to replace worn or damaged OEM blades on compatible zero-turn, riding, or garden tractors.

Fitment & Compatibility

Before buying, verify your mower’s deck size is exactly 50 inches—measure from blade tip to blade tip across the deck. These blades are aftermarket replacements, not OEM, so they fit multiple brands (e.g., John Deere, Husqvarna, Cub Cadet, Troy-Bilt) that use a 50-inch deck with a center hole diameter of 1 inch and a star-shaped drive pattern. Check your current blade’s length (likely 16.5 inches), width (around 2.5 inches), and thickness (about 0.2 inches). Confirm the blade part number cross-references to OEM numbers like Rotary 11479, John Deere M155220, or Husqvarna 532155220. Measure your existing blade’s mounting hole pattern—these use a 5-point star center hole—and ensure your spindle matches. If your mower uses a different hole pattern (e.g., oval or round), these won’t work.

Key Things to Know

• Quality: Aftermarket steel, typically less hardened than OEM, so expect slightly shorter lifespan under heavy use or in rocky soil. Fine for regular grass cutting.
• Installation: Straightforward with a socket wrench and torque wrench—tighten to 40-50 ft-lbs. No special tools needed, but use thread locker on the bolts to prevent loosening.
• Balance: These come unsharpened and may need balancing before install. Use a blade balancer to avoid vibration that can damage the spindle or deck.
• Common Gotcha: The star center hole can be tight on some spindles—file down any burrs if it doesn’t slide on easily. Also, check that the blade’s lift (the angled edge) points upward toward the deck when installed.

Should You Buy It

If you need a budget-friendly replacement for a 50-inch deck mower and are comfortable with basic DIY installation (including balancing), this set is a solid value—just verify your spindle’s star pattern and dimensions first. Skip it if you demand OEM durability or have a non-standard deck.