Oregon 3 Pack 594-078 Mower Blade Gator G5 Fits Exmark 115-5059-03

What It Is

This is a 3-pack of Oregon Gator G5 mulching blades (model 594-078), designed to replace Exmark 115-5059-03 blades on zero-turn mowers. They’re built for heavy mulching, bagging, and side-discharge on commercial and residential mowers with 18.5-inch blade decks.

Fitment & Compatibility

• Deck size: Fits 18.5-inch blade length, 1-inch center hole, 0.75-inch diameter arbor hole, 0.250-inch blade thickness.
• OEM cross-reference: Replaces Exmark 115-5059-03, 103-2571-03; also fits select Toro, Scag, and John Deere models—verify your deck’s spindle and blade pattern.
• Check before buying: Measure your existing blade length, hole size, and offset. Ensure your mower deck has a 1-inch center hole and 0.75-inch arbor hole (common on Exmark Lazer Z and Turf Tracer models). Confirm your mower brand is listed in Oregon’s compatibility chart—this is not a universal fit.
• Aftermarket note: Oregon is a top-tier aftermarket brand; these are direct replacements but not OEM—quality is comparable or better.

Key Things to Know

• Mulching performance: The “G5” wave design and heat-treated steel create a vacuum that lifts grass for finer clipping—excellent for mulching leaves and tall grass.
• Installation: Easy bolt-on replacement if you have a blade removal tool and torque wrench. Tighten to 70-90 ft-lbs; over-torquing can strip threads.
• Durability: Oregon blades are sharp out of the box and hold an edge well, but they’re not for hitting rocks or stumps—replace if bent or nicked.
• Common gotcha: These are not for 21-inch walk-behind mowers; they’re strictly for 18.5-inch zero-turn decks. Double-check your deck model before ordering.

Should You Buy It

Buy this if you own an Exmark zero-turn with a 48- or 52-inch deck and want a durable, high-performance mulching blade that cuts cleaner than OEM and costs less per blade. Skip it if your deck isn’t 18.5-inch or you need a standard lift blade for bagging only.