54" Medium-Lift Mower Blades for John Deere / Craftsman D170 G110 190C LA150 GX21380 GY20679 GY20684 GY20686 SPM684375001 with 54 inch Deck Lawn Mower Replace GX21380, GY20679 (7 Point Star), Black

What It Is

This is a set of three 54-inch medium-lift mower blades designed to replace OEM parts on John Deere and Craftsman lawn tractors with a 54-inch cutting deck. Medium-lift blades balance grass clipping discharge and bagging performance, making them suitable for residential mowing on flat to moderately uneven lawns.

Fitment & Compatibility

Critical checks before purchase:

• Deck size: Only fits 54-inch cutting decks. Measure your deck width to confirm.
• Model compatibility: Fits John Deere D170, G110, 190C, LA150, and Craftsman models using OEM part numbers GX21380, GY20679, GY20684, GY20686, or SPM684375001. Verify your mower’s model number and OEM blade part numbers.
• Star pattern: These blades use a 7-point star center hole. Confirm your spindle shaft matches this pattern (common on John Deere 54-inch decks). A 5-point star or round hole will not fit.
• Measurements: Blade length is approximately 17.5 inches (each). Check your existing blade length and center hole diameter (typically 1 inch with star pattern).
• OEM vs aftermarket: These are aftermarket replacements. They should work identically to OEM blades if fitment matches, but tolerances may vary slightly.

Key Things to Know

• Quality: 4.6-star rating from 16 reviews suggests solid build for residential use. Expect medium-carbon steel – not as durable as high-end premium blades but fine for typical mowing.
• Installation difficulty: Easy if you have a socket set and jack/ramps. Torque blade bolts to 40-50 ft-lbs. Use thread locker if not already applied.
• Common gotchas: The 7-point star is non-standard on some decks – double-check your spindle before ordering. Medium-lift means less suction than high-lift blades, so wet grass or heavy mulching may leave clumps.
• Set includes: Three blades (one center, two outer). Ensure your deck uses three blades – some 54-inch decks use two.

Should You Buy It

Buy if you have a compatible John Deere or Craftsman 54-inch deck with a 7-point star spindle and need a budget-friendly, reliable replacement for standard residential mowing. Skip if you require high-lift blades for wet grass or have a different star pattern (5-point or round). For the price, it’s a solid value for DIY homeowners who match fitment carefully.