3 Pack GX21380 Lawn Mower Blades with Blade Nuts for John Deere 190C D170 LA150 LA175 E180 G110 S180 Replace John Deere 54 inch Mower Blades GY20684 GY20679 GY20686 Medium Lift Mulching

What It Is

A 3-pack of aftermarket 54-inch medium-lift mulching blades designed for select John Deere lawn tractors, including the 190C, D170, LA150, LA175, E180, G110, and S180. These blades replace OEM part numbers GY20684, GY20679, and GY20686, and come with three blade nuts.

Fitment & Compatibility

• Deck size: Fits only John Deere 54-inch mower decks. Measure your existing blade length and center hole diameter to confirm.
• Models: Compatible with 190C, D170, LA150, LA175, E180, G110, S180, and similar models with a 54-inch deck. Not for 42-inch or 48-inch decks.
• OEM vs aftermarket: These are aftermarket replacements for OEM GY20684, GY20679, GY20686. Verify your current blade’s part number before ordering.
• Measurements: Blade length should be approximately 21 inches; center hole diameter is 1 inch. Check blade thickness (typically 0.25 inches) and offset to match your original.

Key Things to Know

• Installation: Moderate difficulty. You’ll need a socket wrench and a torque wrench (recommended torque: 70-90 ft-lbs). Lift the deck or remove blades safely—use jack stands, not just the mower’s lift.
• Quality: Made from hardened steel with a coated finish to resist rust. Users report they cut well and hold an edge for a season with moderate use.
• Common gotcha: The included blade nuts are standard, but some John Deere decks use a different thread pitch (5/8-18 vs 5/8-11). Check your spindle nut thread before installing—if they don’t fit, reuse your original nuts.
• Mulching vs bagging: These are medium-lift mulching blades, so they produce finer clippings for mulching. For bagging, you’ll want high-lift blades instead.

Should You Buy It

If you own a compatible John Deere 54-inch deck tractor and need a cost-effective set of mulching blades with included nuts, this 3-pack is a solid value—especially if you’re okay with aftermarket quality for routine replacement. It’s not for bagging or decks smaller than 54 inches.