2 Pack GY20850 Mower Blades with Nut&Washer Replaces UC21583 GX22151 AM141033 AM141031 AM137333 AM137328 for Deere John 42 Inch D100 E130 D130 D110 105 102 X300 S240 E120 E100 Z225 115 Decks

What It Is

This 2-pack of replacement mower blades (with nuts and washers) is designed for 42-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. Each blade is 21 inches long, with a 1-inch center hole and 5-point star drive, and a 0.25-inch thickness—suitable for residential mulching, bagging, and side-discharge mowing.

Fitment & Compatibility

Before buying, confirm your machine has a 42-inch deck and that the blade length matches your OEM blade at 21 inches. These replace John Deere part numbers UC21583, GX22151, AM141033, AM141031, AM137333, and AM137328. Fits models including: D100, D110, D130, E100, E120, E130, 102, 105, X300, S240, Z225, and 115 series. Do not assume fit—measure your current blade length and check the star drive pattern (5-point) matches your spindle. Aftermarket, not OEM, so verify deck clearance if you have a deeper or custom deck.

Key Things to Know

• Quality: Medium carbon steel, painted black. Adequate for residential use but may dull faster than OEM high-carbon blades on heavy or rocky lawns.
• Installation: Easy if you have a socket wrench and a block of wood to jam the blade. Torque nut to 40-50 ft-lbs—don’t overtighten.
• Common Gotcha: The included nuts and washers are generic; if your spindle has a specific shoulder or lock pattern (e.g., flange nut), reuse your original hardware.
• Balance: Out of the box, these are usually balanced, but check with a blade balancer before installing to avoid vibration.

Should You Buy It

Buy this 2-pack if you need a budget-friendly, direct-fit replacement for a 42-inch John Deere residential deck and don’t require premium steel for frequent heavy-duty mowing. It’s a solid value for typical lawn care, but skip it if you mow tough, debris-heavy areas or want OEM longevity.