(2PCS) GY20850 Lawn Mower Mulching Blades - Replace OEM GX22151 AM137328 AM137333 AM141033 - Fits John Deere D110 D120 D125 E100 E110 LA135 S240 X105 X110 X120 X300 Z225 - 42 Inch Deck Lawn Mower

What It Is

This is a set of two mulching blades designed to replace OEM blades on John Deere lawn tractors with a 42-inch cutting deck. They are intended for users who want finer grass clippings that decompose quickly, reducing the need for bagging.

Fitment & Compatibility

• Deck size: Fits only 42-inch John Deere decks (verify your deck measures 42" edge to edge).
• Models: Compatible with D110, D120, D125, E100, E110, LA135, S240, X105, X110, X120, X300, Z225, and similar 42" deck models.
• OEM replacements: Replaces John Deere part numbers GX22151, AM137328, AM137333, AM141033.
• Measurements: Blade length is 21 inches, center hole is 7/8-inch diameter, with a 5-point star drive. Check your existing blade’s length, hole size, and drive pattern before buying. If your deck uses a different hole shape (e.g., oval or hex), these won’t fit.

Key Things to Know

• Quality: Made from heat-treated steel; reviews note they hold an edge well for the price but may be slightly thinner than OEM blades.
• Installation: Moderate difficulty. You’ll need a socket wrench, torque wrench (recommended 40–50 ft-lbs), and jack or ramps to access the deck. Always disconnect the spark plug first.
• Common gotcha: These are mulching blades, not standard lift blades. They produce finer clippings but don’t discharge well—expect clumping in wet grass. Not ideal for bagging.
• Set includes: Two blades (most 42" decks use two blades), but no hardware. Reuse your existing washers and bolts if in good shape; replace them if worn.

Should You Buy It

If you have a 42-inch John Deere lawn tractor and want a budget-friendly mulching upgrade for regular dry-weather mowing, this set delivers solid value. Skip it if you need bagging performance, have a different deck size, or prefer OEM thickness.