Exmark 103-6400-S Notched Blade Lazer Z CT HP 3 Pack

What It Is

The Exmark 103-6400-S is a factory OEM notched blade designed specifically for Exmark Lazer Z CT and HP zero-turn mowers. It is sold as a 3-pack, intended for commercial-grade cutting on 48-inch, 52-inch, and 60-inch decks that use three blades.

Fitment & Compatibility

Before purchasing, confirm these details:

• Deck size: Fits 48-inch, 52-inch, and 60-inch Lazer Z decks that use three blades. Measure your deck width to be sure.
• Model compatibility: Designed for Exmark Lazer Z CT and HP series. Not for Lazer Z X-Series or other Exmark models unless specified.
• OEM vs aftermarket: This is an Exmark OEM part (not a generic replacement). If you need a direct factory fit, this is it. Aftermarket blades may differ in thickness, balance, or hole pattern.
• Measurements: Blade length is approximately 18.5 inches, center hole diameter 0.625 inches (5/8-inch), and notch spacing matches factory specs. Measure your old blade’s length, hole size, and notch position to verify.
• Check your deck model number on the mower’s serial tag. If in doubt, call Exmark support with your model/serial number.

Key Things to Know

• Quality: OEM blades are heat-treated and balanced for commercial use. They hold an edge longer than budget aftermarket options.
• Installation difficulty: Moderate. You’ll need a socket wrench and a blade removal tool (or a block of wood to prevent spinning). Torque bolts to 40-50 ft-lbs.
• Common gotcha: Notched blades are directional. Ensure the notch faces upward (toward the deck) when installed. Installing upside down reduces cut quality and can damage the spindle.
• Packaging: The 3-pack includes matched blades for balanced cutting. Do not mix with used or different-brand blades on the same deck.

Should You Buy It

This is the right choice if you own an Exmark Lazer Z CT or HP and want a direct, no-guesswork OEM replacement that delivers consistent commercial-grade performance. If you’re on a tight budget or own a different Exmark model, look for aftermarket alternatives or verify compatibility first. For most Lazer Z CT/HP owners, this 3-pack is a reliable, time-saving buy.