Mr Mower Parts 3-Pack Notched High Lift Blade Set for Exmark 103-6404 103-6404-S 72" Cut Fits Exmark Lazer Z Models

What It Is

This is a 3-pack of notched high lift blades designed for Exmark Lazer Z zero-turn mowers with a 72-inch cutting deck. The high lift profile increases airflow for superior grass clipping discharge in bagging or side-discharge applications, ideal for commercial operators or homeowners with thick, wet grass.

Fitment & Compatibility

Before buying, verify these three things:

1. Deck size: These blades are for 72-inch cut decks only. Measure your deck width if unsure—common Exmark Lazer Z models with 72" decks include the S, Z, X, and E-Series.
2. OEM cross-reference: These replace Exmark part numbers 103-6404 and 103-6404-S. Check your current blade part number (stamped on the blade) to confirm match.
3. Measurements: Blade length is 20.5 inches overall, center hole diameter 1 inch, and thickness 0.1875 inch. Notched design requires the blade bolt to align with the notch—ensure your spindle bolts are compatible (typically 5/16" or 3/8").
4. Not universal: Will not fit 60" or 48" Exmark decks, or non-Exmark brands without verifying spindle pattern.

Key Things to Know

• Lift vs. mulching: High lift blades provide excellent bagging/side-discharge but create more dust and wear faster in dry, dusty conditions. Not ideal for mulching kits.
• Installation: Requires a torque wrench—tighten blade bolt to 70-90 ft-lbs (check your mower manual). Use thread locker if bolts are reused. The notch must face upward toward the deck.
• Balance: Aftermarket blades may need balancing before install. Use a blade balancer—unbalanced blades cause vibration, spindle wear, and poor cut quality.
• Sharpening: Resharpenable but don’t thin the edge beyond 1/16 inch. Replace when the notch depth is less than 1/4 inch.

Should You Buy It

If you own an Exmark Lazer Z with a 72-inch deck and need reliable, high-lift replacement blades for bagging or side-discharge mowing, this 3-pack offers good value at $59.99 with solid reviews. It’s a direct OEM replacement at a lower price point. Skip it if you run a mulching setup or need low-lift blades for sandy/dusty conditions.