8TEN LawnRAZOR Blade Set for Exmark Lazer Z AC AS 103-6404-S 72 Inch Deck (Notched High Lift) 3 Pack

What It Is

The 8TEN LawnRAZOR Blade Set is a 3-pack of notched high-lift blades designed for 72-inch Exmark Lazer Z AC and AS mower decks. These blades replace OEM part 103-6404-S and are built for heavy-duty commercial cutting, providing superior grass lift and discharge in tall or wet conditions.

Fitment & Compatibility

• Deck size: 72 inches only; confirm your Exmark deck is exactly 72 inches (not 60 or 48).
• Models: Exmark Lazer Z AC, Lazer Z AS, and select other Lazer Z variants with 72-inch decks.
• OEM replacement: Directly replaces Exmark part number 103-6404-S. Not compatible with Lazer Z X-Series or other deck types without checking blade dimensions.
• Measure before buying: Blade length is 21.75 inches, center hole is 5/8 inch, and thickness is 0.204 inch. Verify these match your existing blades.
• Notched design: The notch on the blade’s trailing edge is specific to high-lift performance; ensure your spindle assembly accommodates this shape.

Key Things to Know

• Installation difficulty: Moderate—requires a torque wrench (set to 70–90 ft-lbs) and lifting the mower safely. Use blade removal tools to prevent spinning.
• Quality: Made from heat-treated boron steel; holds an edge well but may dull faster on sandy or rocky terrain compared to OEM.
• Balance: Each blade is pre-balanced, but always check with a balancer after installation to avoid vibration and spindle wear.
• Common gotcha: The notched high-lift design increases air drag, which can reduce engine RPM slightly; ensure your deck belt and spindles are in good condition.

Should You Buy It

If you own a 72-inch Exmark Lazer Z AC or AS and need a cost-effective alternative to OEM blades for heavy residential or commercial use, this set delivers strong lift and durability. It’s ideal for operators who mow tall, damp grass frequently and want to save roughly 30% over OEM pricing. Avoid if you mow in extremely abrasive conditions or need a low-lift blade for fine turf.