8TEN LawnRAZOR Mower Blade Set for John Deere 42 inch Cut Deck GX22151 GY20850 AM137333 AM137328 AM141033 (Mulching)

What It Is

This is a set of three high-lift mulching blades designed for John Deere 42-inch cutting decks. They replace OEM parts GX22151, GY20850, AM137333, AM137328, and AM141033, intended for residential mulching applications.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch cutting deck (measure deck width, not blade length). These blades fit most John Deere 100-, 200-, 300-, and X300-series models with that deck size, including popular models like D105, D110, D125, D130, E100, E110, E120, E130, L100, L110, L120, L130, LA105, LA110, LA115, LA120, LA125, LA130, LA135, LA140, LA145, X300, X304, X310, X320, X324, X330, X340, X350, X354, X360, X370, X380, X384, X390, and X394. Each blade measures 21 inches long with a 1-inch center hole and 5-point star drive. They are aftermarket replacements—not OEM—but match the dimensions and mounting pattern of the listed John Deere parts. If your mower uses a different blade length, center hole size, or drive pattern, these won’t fit.

Key Things to Know

• Mulching performance: The high-lift design recirculates clippings for finer cut and better nutrient return, but it requires dry grass and moderate cutting height. Wet or tall grass may clog.
• Installation difficulty: Easy—requires a socket wrench and blade removal tool. Torque blades to 30–40 ft-lbs (check your manual). Always disconnect spark plug first.
• Common gotchas: These blades are not universal—verify your deck uses three blades, not two. Some users report slight balance differences; a quick bench test after install ensures smooth operation.
• Durability: Made from heat-treated steel, but they dull faster than OEM or premium aftermarket blades if used on sandy soil or rocky terrain.

Should You Buy It

Buy this set if you own a compatible John Deere 42-inch deck mower, want an affordable mulching upgrade from standard blades, and don’t mind replacing them more frequently than premium options. It’s a solid value for homeowners who cut weekly and prioritize fine clippings over longevity. Skip it if you need bagging or side-discharge blades, or if you cut heavy, wet grass regularly.