Rotary 60" 6303 Commercial Gator Mulch Lawnmower Blade Set (3) 5/8" Center Hole

What It Is

This is a set of three Rotary 6303 Gator mulch blades designed for 60-inch commercial zero-turn mowers. They use a 5/8-inch center hole and are built to shred clippings into fine mulch for improved lawn appearance and nutrient recycling.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Only fits 60-inch cutting decks. Measure your deck width if unsure.
• Center hole: Must be exactly 5/8 inch. Most commercial zero-turns use this, but check yours.
• Blade length: The 6303 is 20.5 inches long. Measure your current blade from tip to tip.
• OEM cross-reference: Replaces many OEM blades, including John Deere M158079, M155129, and M159100; Kubota K5371-99210; and Gravely 47003. Compare your OEM part number.
• Brand/model: Fits many 60-inch commercial mowers from John Deere, Kubota, Gravely, Ferris, and others with a 5/8-inch center hole and 20.5-inch blade length. Confirm your model’s blade pattern (some use a different hole shape or offset).

Key Things to Know

• Mulching performance: The “Gator” design (serrated, curved wings) chops clippings finer than standard blades. Best for dry grass; wet grass may clump.
• Installation: Simple swap—remove old blades, clean spindle, torque bolts to 70–90 ft-lbs. No special tools needed beyond a socket wrench.
• Durability: Rotary is a known aftermarket brand. These blades are heat-treated steel but may dull faster than OEM high-carbon blades if you mow rocky or sandy soil.
• Balance: Check blade balance after installation (use a blade balancer). Unbalanced blades cause vibration and spindle wear.

Should You Buy It

Buy this set if you own a 60-inch commercial zero-turn with a 5/8-inch center hole and want an affordable, effective mulch upgrade. It’s ideal for operators who prioritize clean mulching over bagging or side-discharge. Skip it if your deck uses a different hole size, or if you need extreme durability for heavy debris.