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Model: NACHI 6304ZZE - Two dust cover deep groove ball bearings>
Bearing Size
d = 20D = 52
B = 15
da(min) = 27
Da(max) = 45
ra(max) = 1.1
Mass = 0.144
Basic load rating: 15900
Rated static load: 7900
Limit speed（Grease lubrication）: 9500
