Grasscool E140 D140 7 Star Blades Repalce John D-eere GY20852 GX21784 for D160 E160 E170 E150 LA145 LA140 48 inch Deck Zero Turn Lawn Mower Tractor

What It Is

This is a set of three 7-star replacement mower blades designed for 48-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. They’re a direct aftermarket alternative to OEM part numbers GY20852 and GX21784.

Fitment & Compatibility

• Deck size: Only fits 48-inch decks. Measure your deck width from side to side before ordering—this won’t work on 42-inch or 54-inch decks.
• Models: Compatible with John Deere D140, D160, E140, E150, E160, E170, LA140, LA145, and select zero-turn mowers with a 48-inch deck (check your model’s deck part number).
• OEM replacement: Replaces OEM GY20852 and GX21784. These are aftermarket blades, not John Deere factory parts.
• Measurements: Each blade is roughly 20.5 inches long, 2.5 inches wide, with a 7-point star center hole and 0.5-inch diameter. Verify your existing blade’s length and center hole shape—if you have a different hole pattern, these won’t bolt on.
• Check before buying: Confirm your mower’s deck model number (stamped on the deck housing) and measure your current blade length and center hole. If you have a 48-inch deck with a star-shaped center hole, these are likely correct.

Key Things to Know

• Quality vs. OEM: Grasscool blades are made of heat-treated steel but may not last as long as John Deere factory blades under heavy use (dense grass, rocky terrain). They’re fine for standard residential mowing.
• Installation: Easy swap—just remove the old blade, clean the spindle, and bolt on the new one. Torque to 30-40 ft-lbs. Use a blade removal tool or block the blade with wood to prevent spinning.
• Common gotcha: The 7-star center hole is specific. If your deck uses a different spindle (e.g., 5-star or round hole), these won’t fit. Also, these are not universal—don’t assume they fit all 48-inch John Deere decks.
• Balance: Each blade is individually balanced, but check with a blade balancer after installation. An unbalanced blade causes vibration and can damage the spindle.

Should You Buy It

Buy this if you have a 48-inch John Deere lawn tractor or zero-turn with a star-pattern spindle and want a budget-friendly replacement for routine mowing. Skip it if you need OEM-grade durability for heavy commercial use or have a different deck size/spindle shape.