Oregon 6PK 20 1/2" 92-031 Lawn Mower Blades Replacement for Exmark Lazer Z 103-6398 116-5174 103-6393 103-6398

What It Is

This is a set of six 20.5-inch Oregon G5 Gator mulching blades (model 92-031) designed for high-end zero-turn mowers like the Exmark Lazer Z. They replace OEM part numbers 103-6393, 103-6398, and 116-5174, and are intended for commercial or residential mowing where fine mulching and bagging are priorities.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 60 inches (six blades at 20.5" each). These fit Exmark Lazer Z and Lazer Z X-Series models with 60" decks using those OEM blade numbers. Also compatible with some Toro and Scag 60" decks, but always cross-reference your deck’s blade part number. Measure your current blade length (center hole to tip) and check the center hole size (typically 5/8" or 7/16" hex, but verify). Aftermarket blades like these may require different washers or spacers than OEM—keep your original hardware handy.

Key Things to Know

• Quality: Oregon G5 Gator blades have a heat-treated cutting edge and a patented “Gator” notch design for finer mulching. They are heavier than standard blades, which can reduce lift in wet grass.
• Installation: Easy with a socket wrench. Use a torque wrench (40-50 ft-lbs) and tighten in a star pattern. Never reuse lock washers.
• Gotchas: These blades are not for side-discharge decks without a mulching kit. They may also create more noise than OEM flat blades. Check blade balance after installation—Oregon blades are usually balanced, but verify.
• Lifespan: Expect 25-50 hours of use depending on debris and mowing frequency. Sharpen or replace sooner if you see ragged cuts.

Should You Buy It

If you own a 60" Exmark Lazer Z and want OEM-level mulching performance at a lower price, these are a solid buy. They’re ideal for commercial operators who mow frequently and want fine grass clipping breakdown. Avoid if you strictly side-discharge or need the lightest blade possible.