8TEN LawnRAZOR Blade for John Deere LA140 LA145 LA155 LA165 D140 48 Inch Deck GY20852 GX21784 AM141035 (Mulching) 6 Pack

What It Is

This is a 6-pack of mulching blades designed for 48-inch cutting decks on specific John Deere lawn tractors. They replace OEM part numbers GY20852, GX21784, and AM141035, and are intended for mulching grass clippings into fine particles rather than side-discharging or bagging.

Fitment & Compatibility

Measure your deck first. These blades only fit John Deere 48-inch decks (not 42-inch or 54-inch). Confirm your model is on this list: LA140, LA145, LA155, LA165, D140. Also fits select LA130/LA150 series decks with the same OEM part numbers. Check blade length: Each blade is 20.5 inches long, with a 1-inch center hole and 3/8-inch offset. Measure your existing blade’s length and center hole diameter. If you have a different OEM number (like GY20851 or AM137399), these will not fit. OEM cross-reference: GY20852, GX21784, AM141035. These are direct replacements for those parts.

Key Things to Know

• Mulching only. These blades have a curved, high-lift design to recirculate clippings. They will not perform well for bagging or side-discharge—use dedicated blades for those jobs.
• Installation tip: Torque the blade bolt to 70-80 ft-lbs. Over-tightening can strip the spindle; under-tightening can cause the blade to slip or detach.
• Balance check: After sharpening (if needed), always balance the blades. An unbalanced blade causes vibration, poor cut quality, and spindle wear.
• 6-pack value. At ~$8.83 per blade, this is cheaper than buying singles. But if you only need one or two, you’re stuck with extras. Rotate them as spares.

Should You Buy It

Buy this if you own a compatible John Deere 48-inch deck model and want a cost-effective mulching blade set for regular replacement. It’s a solid value for the price and rating, but only if you’re committed to mulching—not for bagging or side-discharge use. If you need a single blade or a different deck size, skip it.