8TEN LawnRAZOR Blade Set for John Deere LA140 LA145 LA155 LA165 D140 48 Inch Deck GY20852 GX21784 AM141035 (Mulching)

What It Is

The 8TEN LawnRAZOR Blade Set is a three-blade, mulching replacement kit designed for 48-inch cutting decks on select John Deere lawn tractors. It’s built to finely chop grass clippings for nutrient recycling, reducing bagging needs.

Fitment & Compatibility

Before buying, verify your deck size is exactly 48 inches (models like the LA140, LA145, LA155, LA165, and D140 use this). Check your current blade part numbers: this set directly replaces OEM GY20852, GX21784, and AM141035. Measure your blade length (should be ~17.5 inches) and center hole (typically 1 inch). Also confirm the blade shape—this is a mulching design with a higher lift and more curve than standard cutting blades. If your deck has a side-discharge or bagging setup, these blades will still work, but they’re optimized for mulching.

Key Things to Know

• Quality: Made from heat-treated steel with a black coating for rust resistance. Expect them to stay sharp for 10-15 hours of mowing on average turf.
• Installation: Moderate difficulty—requires a socket wrench and torque wrench (recommended 45-55 ft-lbs). Always lift the deck and disconnect the spark plug first.
• Common gotcha: These blades are slightly thicker than stock, so ensure your blade spindle bolts are long enough to thread fully—if not, use OEM bolts.
• Mulching vs. cutting: For best results, use with a mulching plug or cover kit; otherwise, clippings may clump in wet grass.

Should You Buy It

If you own one of the listed John Deere tractors with a 48-inch deck and want a affordable, high-rated mulching blade that outperforms basic OEM sets, this is a solid choice. It’s best for homeowners who mow weekly and prefer a clean, finely mulched lawn without bagging. Not ideal for commercial use or decks under 48 inches.