3PK Lawn Mower Blades Replacement for 48" JD D140 D150 D160 LA130 LA140 LA145 LA155 LA165 X140 X165 Z245 Z255 145 155C AM137757 AM141035 GX21784 GY20852

What It Is

This is a set of three replacement blades for 48-inch John Deere lawn tractors and zero-turn mowers, designed to cut grass on residential properties with decks requiring a 21-inch blade length.

Fitment & Compatibility

Before buying, confirm your mower has a 48-inch deck (three blades, each 21 inches long). This set fits popular John Deere models: D140, D150, D160, LA130, LA140, LA145, LA155, LA165, X140, X165, and Z245, Z255, plus 145, 155C. Cross-reference OEM part numbers: AM137757, AM141035, GX21784, GY20852. Measure your current blade length (center hole to tip) – it must be exactly 21 inches. The center hole is 5/8-inch diameter, and the blade offset is 1/2-inch. Not compatible with 42-inch or 54-inch decks.

Key Things to Know

• Quality: Made from heat-treated steel with a coated finish to resist rust. Edge holds up well on grass but dulls faster if hitting rocks or sticks.
• Installation: Straightforward – remove the blade bolt (typically 5/8-inch or 15/16-inch socket), note the blade orientation (sharp edge faces forward), and torque the bolt to 40-50 ft-lbs. Use thread locker for safety.
• Common gotcha: These are standard (not mulching) blades. If your deck has a mulching plug, you’ll need a mulching blade set instead.
• Weight: Each blade weighs about 1.5 lbs – significantly lighter than OEM blades, which may reduce blade tip speed slightly.

Should You Buy It

This is a solid budget-friendly replacement for routine blade swaps on 48-inch Deere decks. If you mow fairly clean, level lawns and want to save money over OEM blades, go for it. Avoid if you need mulching blades, hit debris frequently, or require exact OEM weight/balance.