GY20850 Mower Blades with Blade Nuts & Washers for John Deere D110 D105 D130 S240 X300 E100 E120 E130 LA115 LA105 Decks Replaces GY20850 John Deere 42 inch Mower Blades AM141033 GX22151

What It Is

This is a set of three 42-inch mower blades designed for John Deere lawn tractors, complete with blade nuts and washers. It’s a direct replacement for the OEM GY20850 part, intended for residential mowing on 42-inch decks.

Fitment & Compatibility

Before buying, confirm your deck size is exactly 42 inches—measure from blade tip to blade tip. This set fits John Deere models: D105, D110, D130, S240, X300, E100, E120, E130, LA115, and LA105. It replaces OEM part numbers GY20850, AM141033, and GX22151. These are aftermarket blades, so verify that your spindle pattern matches (three-hole, 1-inch center hole). Check your blade length: 21 inches each, total 42 inches across. If your deck uses a different bolt pattern or length, these won’t work.

Key Things to Know

• Quality: 4.8/5 rating from 31 reviews suggests good durability, but aftermarket steel may be thinner than OEM—expect slightly shorter life if you mow rough terrain.
• Installation: Easy DIY job with a socket wrench. Includes nuts and washers, but you may need a torque wrench (recommended 40-50 ft-lbs). Lift the deck safely and disconnect the spark plug.
• Gotcha: These are non-OEM, so the blade balance may vary slightly. Check balance before mounting (hang on a nail through the center hole) and file off any heavy side to avoid vibration.
• Sharpness: They come sharp but not razor-edged. Sharpen after a few uses for best cut quality.

Should You Buy It

If you own one of the listed John Deere models with a 42-inch deck and want a budget-friendly, highly rated replacement that includes hardware, this is a solid choice. Avoid if you need OEM-grade thickness or mow heavy commercial loads—go with factory blades instead.