GY20850 42" Mulching Mower Blades for John Deere D105 D130 S100 S110 S240 LA115 X300 E100 E110 LA135 Replace GX22151 AM137328 AM137333 AM141033 GX21694 M149422 42 inch Deck Lawn(7-Point Star), Black

What It Is

This is a set of three 42-inch mulching blades designed to replace OEM blades on select John Deere lawn tractors with a 42-inch deck and a 7-point star spindle. The blade design lifts and recuts clippings for finer mulch, reducing bagging frequency.

Fitment & Compatibility

Must check before buying:

• Deck size: Only fits 42-inch cutting decks. Measure your deck width (blade tip to tip) to confirm.
• Spindle type: Requires a 7-point star center hole (not a 5-point or oval). Measure your spindle or look at your current blade’s center hole.
• Model compatibility: Fits John Deere D105, D130, S100, S110, S240, LA115, X300, E100, E110, LA135. Also fits select models with 42-inch decks that use OEM part numbers GX22151, AM137328, AM137333, AM141033, GX21694, or M149422.
• Blade length: Each blade is approximately 21 inches long (end to end). Confirm your deck’s blade length matches.
• OEM cross-reference: These are aftermarket replacements for the listed OEM numbers. They are not genuine John Deere parts.

Key Things to Know

• Quality: Black powder-coated finish resists rust, but the coating may wear off after a few mowings. Steel thickness is comparable to OEM.
• Installation: Easy DIY job—use a socket wrench and a block of wood to lock the blade. Torque bolts to 35-45 ft-lbs. No special tools needed.
• Mulching performance: Works well for dry grass up to 3-4 inches tall. For wet or tall grass, bagging or side discharge may be better.
• Common gotcha: The 7-point star hole must align exactly with your spindle. If you have a 5-point star or oval hole, these will not fit. Also, check that the blade’s center hole diameter is 1 inch (standard for most Deere 42-inch decks).

Should You Buy It

Buy this set if you own a compatible John Deere with a 42-inch deck, want an affordable mulching upgrade, and are comfortable with a straightforward DIY installation. It’s a solid value for regular lawn maintenance, but if you need maximum durability for heavy-duty commercial use, consider OEM blades instead.