2 Pack GY20850 Mower Blades with Blade Nuts for John Deere D100 D105 D110 D130 E100 E120 E130 L100 LA105 LA115 S100 S120 S130 S240 X300 Replaces John Deere 42" Mower Blades GX22151 AM141033

What It Is

This is a 2-pack of 42-inch replacement mower blades (model GY20850) designed for select John Deere lawn tractors, including D100, D105, D110, D130, E100, E120, E130, L100, LA105, LA115, S100, S120, S130, S240, and X300 series. Each pack includes two blades and two blade nuts, making it a direct swap for worn or damaged OEM blades.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 42 inches (not 38, 44, or 48 inches). These blades replace John Deere part numbers GX22151 and AM141033. Check your current blade length (should be ~21 inches) and center hole size (typically 7/8-inch hex or round). Verify your model’s year—older L100/LA100 variants may differ. These are aftermarket blades, not OEM John Deere, so they may not have the same stamped branding or coating. Always cross-reference your deck serial number if unsure.

Key Things to Know

• Quality vs. OEM: At $29.99 for two blades with nuts, these are budget-friendly but may not hold an edge as long as genuine John Deere blades (expect 1-2 seasons of use).
• Installation: Requires a socket wrench (usually 15/16-inch or 5/8-inch for the nut). Torque the blade nut to 45-55 ft-lbs—do not overtighten. Blades are uncoated steel; apply anti-seize to prevent rust.
• Balance: Aftermarket blades may need balancing before install. Use a blade balancer; an unbalanced blade causes vibration and poor cut quality.
• Common gotcha: The included nuts may be thinner than OEM. Reuse your original nuts if they’re in good condition to ensure proper retention.

Should You Buy It

This is a solid budget option for occasional mowing on a 42-inch John Deere tractor (D100/E100 or similar). If you mow weekly on rough terrain or want longer blade life, spend more on OEM or high-carbon blades. For light-duty use, the price and included hardware make it a convenient value.