GICOOL GY20850 Mulching Blades for John Deere 42 inch Deck, 7-Point Star Mower Blades for D110 D130 D105 S100 E100 E120 E130 Z225 LA105, Replace GX22151 AM141033 AM141031, 2-Pack

What It Is

The GICOOL GY20850 is a set of two mulching blades designed for John Deere 42-inch decks. They replace OEM part numbers GX22151, AM141033, and AM141031, and are intended for use on select John Deere lawn tractors and zero-turn mowers.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck and a 7-point star center hole. These blades fit models including D110, D130, D105, S100, E100, E120, E130, Z225, and LA105. Measure your existing blade length—these are 20.5 inches long, 2.5 inches wide, with a 0.25-inch thickness and a 1-inch center hole. They are aftermarket replacements, not OEM, so check that your spindle and blade bolt pattern matches (typically 7-point star). Verify your deck model (e.g., 42A, 42C) if you have a non-standard tractor.

Key Things to Know

• Mulching vs. bagging: These blades are designed for mulching (finer clippings), not standard discharge or bagging. If you switch from a standard blade, expect different cutting performance.
• Installation difficulty: Easy to install with basic tools—lift mower, remove blade bolt (usually 5/8-inch), replace blade, torque to 30-45 ft-lbs. Use a blade stop tool or block wood to prevent rotation.
• Quality check: At $23.90 for a 2-pack, these are budget-friendly. Some users report they are slightly thinner or less durable than OEM, so inspect for warping or bending after heavy use. Sharpening is possible but may not last as long as premium steel.
• Common gotcha: Ensure the blade orientation (cutting edge facing the direction of rotation) and that the star pattern aligns fully. A loose fit can cause vibration or damage.

Should You Buy It

If you need a low-cost mulching blade set for a 42-inch John Deere and don’t mind replacing them more often than OEM, this is a solid value. It’s best for homeowners with light to medium mowing who prioritize price over long-term durability. For heavy commercial use, stick with OEM or premium aftermarket blades.