Pair(2) Mower Blades Compatible with John Deere L100 L110 42" Deck GX20249 GX20433 GY20567

What It Is

This is a set of two replacement mower blades designed for 42-inch cutting decks on select John Deere lawn tractors. They are aftermarket parts intended for standard residential mowing—not for heavy-duty or commercial use.

Fitment & Compatibility

Before buying, confirm your mower deck is exactly 42 inches (measured blade tip to blade tip). These blades fit John Deere models including L100, L110, L120, L130, LA100, LA110, LA120, LA130, and LA140 from the mid-2000s. They replace OEM part numbers GX20249, GX20433, and GY20567.

Check your current blade’s length (should be ~21 inches), center hole diameter (typically 7/16-inch or 5/8-inch—measure yours), and the blade thickness (usually 0.25 inches). Also verify the blade is a standard straight or low-lift design—these are not high-lift or mulching blades. Cross-reference your mower’s model number (found on the frame or under the seat) with the seller’s compatibility list.

Key Things to Know

• Quality vs. OEM: These are aftermarket blades, not genuine John Deere. Expect slightly thinner steel (around 0.19–0.21 inches vs. OEM 0.25 inches) which may wear faster or bend on rocks.
• Installation difficulty: Easy—requires a socket wrench, torque to 55–70 ft-lbs, and a blade removal tool. Always disconnect the spark plug first.
• Common gotcha: These blades are not universal. They will not fit 48-inch or 54-inch decks. Also, the center hole may be slightly off on some aftermarket batches—test fit before tightening.
• Sharpness out of box: Typically sharp enough for a few cuts, but many users recommend sharpening them before first use for best results.

Should You Buy It

If you need a budget-friendly replacement for light residential mowing on a 42-inch John Deere lawn tractor, these blades will work fine. They’re a good value for the price, but don’t expect OEM durability. Best suited for occasional mowing on flat, debris-free lawns. Avoid if you mow rocky terrain or want long-lasting performance.