72" Mower Deck Blades Fit for Exmark Front Runner FR724 Lazer Z X-Series S-Series E-Series AC AS LC Lawn Mower Replaces OEM 103-6404 103-6404-S (Notched High Lift) 3 Pack

What It Is

This is a set of three notched high-lift mower blades designed for 72-inch commercial zero-turn mowers, optimized for superior grass clipping discharge and bagging performance in heavy-duty mowing conditions.

Fitment & Compatibility

Before buying, verify your mower has a 72-inch deck and is an Exmark Front Runner FR724, Lazer Z X-Series, S-Series, E-Series, or AC/AS/LC model. These blades replace OEM part numbers 103-6404 and 103-6404-S. Measure blade length (should be 25 inches) and center hole diameter (should be 1 inch). The notched design is specific to high-lift applications—do not use on standard or mulching decks. Check your spindle orientation and bolt pattern to ensure these match your existing blade setup.

Key Things to Know

• Quality: Aftermarket blades at a lower price than OEM; steel thickness and hardness may vary slightly, but reviews indicate good durability for residential and light commercial use.
• Installation: Straightforward—remove old blades, clean spindles, torque bolts to manufacturer specs (typically 70-90 ft-lbs). Use a blade balancer after installation to prevent vibration.
• Gotchas: Notched high-lift blades create more lift and can increase debris throw—wear eye protection. They are not ideal for mulching or dry, dusty conditions as they stir up more clippings. Ensure blade orientation matches your deck’s discharge direction (usually left or right side).
• Fitment note: Cross-check your mower’s year and serial number with Exmark’s parts list, as some older models may use a different blade length or hole size.

Should You Buy It

Buy if you own a compatible 72-inch Exmark zero-turn and need a cost-effective replacement for OEM 103-6404 blades that maintains strong bagging and side-discharge performance. Avoid if you primarily mulch or need a lighter-duty blade for small lawns.