2PCS 3-N-1 Blades Fit for 42 inch Lawn Mower Blades Compatible with John Deere 102 125 135 D100 D105 D120 D130 LA100 LA105 LA110 Tractor Replace OE GX22151 GY20850 50-3231 AM137333 AM137328

What It Is

This is a set of two 3-in-1 (mulch, bag, side-discharge) mower blades designed to fit 42-inch cutting decks on select John Deere lawn tractors. They replace OEM part numbers GX22151, GY20850, 50-3231, AM137333, and AM137328.

Fitment & Compatibility

Check deck size first: These only fit 42-inch decks. Measure your deck’s cutting width—if it’s 38", 46", 48", or 54", these will not work.

Model list: Compatible with John Deere 102, 125, 135, D100, D105, D120, D130, LA100, LA105, LA110, and similar models with a 42" deck. Not all D-series or LA-series tractors use a 42-inch deck—verify your specific model’s deck size.

Measure your old blade: Length should be approximately 20.5 inches center-to-center (bolt hole to far tip). The center hole is 7/8" diameter. If your blade is longer, shorter, or has a different hole size, these won’t fit.

OEM vs aftermarket: These are aftermarket replacements. They match OEM form and function but are not genuine John Deere parts.

Key Things to Know

• Installation difficulty: Easy. Jack up the mower, block safely, remove the old blade bolt (usually 5/8" or 15/16" wrench), swap blades, and torque the bolt to 70-80 ft-lbs. Use a thread locker if recommended by your manual.
• Balance: Aftermarket blades can sometimes be slightly out of balance. If you feel vibration after install, remove and balance the set on a blade balancer (cheap tool, worth it).
• Sharpness: These come sharp but not razor-sharp. For best cuts, re-sharpen after 25-30 hours of use or if you hit rocks/stumps.
• Gotcha: The 3-in-1 design means they work best with the discharge chute in the proper position for your chosen mode. Don’t expect perfect mulching with the bag attached.

Should You Buy It

If you own one of the listed John Deere models with a 42-inch deck and need a budget-friendly replacement that does all three jobs, this is a solid pick. It’s not a premium OEM blade, but for the price and positive reviews, it’s a reliable option for regular homeowners. Skip it if you want genuine John Deere parts or if your deck isn’t exactly 42 inches.