Oregon 12PK 92-031 Lawn Mower Blades Compatible with Exmark Lazer Z 103-6398 116-5174 103-6393 103-6398

What It Is

This is a 12-pack of Oregon 92-031 replacement blades designed for high-end commercial zero-turn mowers like the Exmark Lazer Z series. They’re meant for operators who need frequent blade swaps on large properties or mowing crews.

Fitment & Compatibility

Before buying, confirm your deck size and blade measurements. These fit Exmark Lazer Z models with 60-inch decks that use OEM part numbers 103-6398, 116-5174, 103-6393, or 103-6398. The blade is 18.5 inches long, 2.5 inches wide, with a 5/8-inch center hole and 0.204-inch thickness. Check your current blade’s length, hole size, and thickness—if any differ, these won’t mount correctly. Also verify your spindle and blade adapter style; some Exmark decks use a different mounting pattern. Oregon is an aftermarket brand—quality is high, but not OEM.

Key Things to Know

• Quality: Oregon blades are heat-treated and hardened, offering good durability and cut quality comparable to OEM. Expect 20-30% longer life than standard blades in light-duty use.
• Installation: Straightforward if you’re comfortable with a socket wrench. Use a blade removal tool to avoid spinning the spindle. Torque bolts to 70-90 ft-lbs.
• Gotchas: The 12-pack is bulk—only cost-effective if you’ll use all within a season. Store extras dry to prevent rust. Not for zero-turn decks smaller than 60 inches.
• Sharpening: These can be sharpened 2-3 times before replacement. Balance after each sharpening to prevent vibration.

Should You Buy It

Buy this if you run a commercial Exmark Lazer Z with a 60-inch deck and go through blades fast enough to justify a 12-pack. Avoid if you have a different deck size, need OEM-only parts for warranty, or only mow a small lawn—you’ll waste money on extras.