Caltric Deck Blade Compatible with John Deere X145 X300 X304 Z225 Z235 S240 (21 3/8" L - 2.6" W) qty2

What It Is

This is a set of two aftermarket replacement mower blades from Caltric, designed for 42-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. Use these when your existing blades are dull, bent, or chipped.

Fitment & Compatibility

Before purchasing, verify the following:

• Deck size: These blades are 21-3/8 inches long and 2.6 inches wide, intended for a 42-inch deck (two blades per deck).
• Model compatibility: Fits John Deere X145, X300, X304, Z225, Z235, S240, and many other models with the same deck. Cross-check your model number with Caltric’s list.
• OEM equivalent: Replaces John Deere part numbers GY20785, GY20786, or GY21197. If your current blade has a different OEM number, measure length and width to confirm.
• Center hole and spindle: These blades use a standard 1-inch center hole with a 5-point star drive. Verify your spindle’s star pattern matches (most John Deere 42-inch decks do).
• Quantity: Sold as a pair (qty 2), so no need to buy two sets for a single deck.

Key Things to Know

• Quality vs. OEM: Caltric blades are aftermarket, typically made from hardened steel, but may not hold an edge as long as genuine John Deere blades. Expect to sharpen or replace more frequently.
• Installation difficulty: Moderate. You’ll need a socket wrench, torque wrench (recommended 35-50 ft-lbs), and a block of wood to lock the blade. Always lift the deck or remove the blade for safety.
• Balance check: Aftermarket blades sometimes come slightly unbalanced. Spin each blade on a nail or balancer before installing to avoid vibration.
• Common gotcha: The star drive pattern can be tight on new blades. If it doesn’t slide onto the spindle easily, don’t force it—check for burrs or debris.

Should You Buy It

This is a solid budget-friendly option if you’re replacing dull blades on a 42-inch John Deere deck and don’t mind slightly shorter lifespan than OEM. The price is low for a pair, and fitment is reliable for listed models. Not ideal for commercial use or if you demand maximum cut quality—stick with genuine John Deere blades for that.