48 Inch Deck Mower Toothed Blade Fit John Deere 145 155C LA130 LA140 LA145 LA155 LA165 D140 D150 D160 100 Lawn Mower Replaces OEM GY20852 GX21786 GX21784 AM137757 AM141035

What It Is

This is a 48-inch deck mower blade set for John Deere lawn tractors, featuring a toothed cutting edge designed for mulching grass clippings into fine particles. It’s intended for residential mowing on flat to moderately uneven turf, not for heavy-duty commercial use.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 48 inches (measured blade tip to blade tip). This set fits John Deere 100-series models: 145, 155C, LA130, LA140, LA145, LA155, LA165, D140, D150, D160. Also fits 100 (non-LA/D) series with 48-inch decks. Replaces OEM part numbers GY20852, GX21786, GX21784, AM137757, AM141035. Check your current blade’s center hole diameter (should be 1 inch) and overall length (about 21 inches per blade). Measure your existing blade—aftermarket blades can vary slightly in thickness or hole alignment. Verify your deck’s spindle orientation; some models use two blades, others three. Cross-reference your mower’s model number on the OEM compatibility list to avoid returns.

Key Things to Know

• Quality: Made from heat-treated steel with a toothed edge for mulching. Expect decent durability for residential use, but may dull faster on rocky or sandy soil compared to premium brands.
• Installation: Moderate difficulty. Requires a socket wrench, torque wrench (set to 70-90 ft-lbs), and blade removal tool or block of wood to prevent spinning. Always disconnect spark plug first.
• Common gotchas: The toothed edge is directional—install with the teeth facing upward for mulching, not downward for bagging. If your deck uses a different blade offset (e.g., flat vs. dished), this set may not align properly. Check blade balance after installation; unbalanced blades cause vibration and deck damage.
• Wear: Replace blades every 25 hours or when nicked/dull. Toothed blades clog more easily in wet grass; avoid mowing when damp.

Should You Buy It

If you own a compatible John Deere 48-inch deck tractor and primarily mulch your lawn, this is a solid, affordable replacement for OEM blades. It’s not for bagging or side-discharge setups, nor for heavy commercial use. For the price, it delivers good value for typical residential mowing.