Mr Mower Parts 60" Mower Blade Set of 3 Compatible with Exmark 103-6403 103-6403-S High Lift Notched Blades

What It Is

This is a set of three 60-inch high-lift notched blades designed for commercial zero-turn mowers, specifically Exmark Lazer Z and Lazer Z X-Series models. They replace OEM part numbers 103-6403 and 103-6403-S, offering improved grass lift and discharge for thick or wet turf.

Fitment & Compatibility

Before buying, verify three things:

• Deck size: Must be a 60-inch cutting deck.
• Blade measurements: Each blade is 20.5 inches long, 2.5 inches wide, with a 0.25-inch center hole and a 0.625-inch center hole diameter. Check your existing blades for these specs.
• Model fit: Compatible with Exmark Lazer Z, Lazer Z X-Series, and select Toro/TimeCutter models using the same OEM number. Not universal—confirm your deck’s blade pattern (3-blade, not 2-blade).
• OEM vs aftermarket: These are aftermarket replacements; they match OEM dimensions but use a high-lift design for better clipping discharge.

Key Things to Know

• Quality: High-lift blades require more engine power and can increase fuel consumption slightly, but they excel in bagging or side-discharge scenarios.
• Installation: Easy bolt-on swap—use a torque wrench to 70-90 ft-lbs. Check blade orientation: the notched edge faces upward toward the deck.
• Common gotcha: These blades are not for mulching; they’re designed for discharge or bagging. Using them on a mulching deck may cause clumping.
• Durability: Heat-treated steel with a protective coating; expect 25-50 hours of life on commercial mowers, longer on residential use.

Should You Buy It

If you own a 60-inch Exmark Lazer Z and need reliable, high-lift blades for thick grass or bagging, this set is a solid, cost-effective alternative to OEM. It’s not for mulching or low-lift applications, but for discharge performance, it delivers at a lower price point.