GY20850 Mower Blades - Fit for John Deere D130 D110 D100 D125 D105 S100 E100 LA125 42'' Deck Lawn Tractor Riding Mower Gator Mulching Blades - Replaces GX22151 AM141033 AM131033 AM137333

What It Is

This is a set of three mulching blades designed to fit 42-inch cutting decks on popular John Deere lawn tractors and similar models. They chop grass clippings into fine particles that decompose quickly, eliminating the need for bagging.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck (not 48” or 54”). These blades are direct replacements for OEM part numbers GX22151, AM141033, AM131033, and AM137333. They fit John Deere D100, D105, D110, D125, D130, S100, E100, and LA125 models, plus many Gator utility vehicles with the same deck. Measure your existing blade length (should be ~20.5 inches center-to-center), center hole diameter (~1 inch), and thickness (~0.25 inches). Also check that the blade spindle pattern matches—these have a five-point star center hole.

Key Things to Know

• Mulching vs. standard blades: These are designed for mulching, not side-discharge or bagging. They work best when you mow frequently and keep grass dry.
• Installation difficulty: Easy to swap with basic hand tools (socket wrench and torque wrench). Torque blade bolts to 45–55 ft-lbs. Use thread locker to prevent loosening.
• Aftermarket quality: Budget-friendly compared to OEM John Deere blades, but some users report they dull faster or are slightly thinner. Check for balance out of the box—unbalanced blades cause vibration and uneven cuts.
• Common gotcha: These blades are not universal. They only fit the 42-inch deck with the star-shaped center hole. Do not use on decks with a round center hole or different spindle pattern.

Should You Buy It

If you own one of the listed John Deere models with a 42” deck and want an affordable mulching blade set for regular lawn maintenance, this is a solid choice. However, if you mow tough, thick grass or need maximum durability, consider spending more on OEM or premium aftermarket blades.