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Why buy John Deere replacement blades? Genuine John Deere parts for application-specific design.
Comparison below is of John Deere blades versus comparable competitive blades (blades not manufactured by John Deere, but sold to fit the same equipment).

Stake Test Results:
Fragments of competitive blade resulting from stake test
Competitive Blade Fragments
John Deere blade bends from impact during stake test instead of fragmenting
John Deere Original Equipment Rotary Mower Blade

Blade Comparisons:
Features John Deere Rotary Blade Competitive Blade
Trueness to Engineering Specifications
Size of centre hole: Perfectly sized to spindle alignment boss. Centre hole too large leads to moderate blade and deck vibration.
Location of centre hole: Hole is located in exact centre of blade. Mislocated centre holes leads to serious vibration and blade-to-blade contact.
Flatness of blade/spindle contact area: Blade remains flat while tightening blade bolt. As blade is tightened, ends do not remain flat and blades become misaligned.
Material and Heat Treatment Combines carbon with boron and other materials to provide hardenability for long life without brittleness. Some competitive companies sell hardness only, compromising safety with brittle blades. Others don't control the material or heat-treating process, resulting in blades that are too soft and wear quickly or are too hard and brittle.
Rigorous Testing
Fatigue Test: Blades shaken over 6 million cycles to simulate abusive environment.
Stake Test: Blade approaches 322 km/h (200 mph), then encounters 2.54 cm (1 in.) steel rod. Blade must BEND, not fragment (see results above). Aftermarket blade fragments in stake test. (See results above)
Field Test: All new blades are tested at field test sites in Wisconsin and Florida for wear and longevity.