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Model: NACHI 6904 - 2NSE - Double contact sealed deep groove ball bearings>
Bearing Size
d = 20D = 37
B = 9
da(min) = 22
Da(max) = 35
ra(max) = 0.3
Mass = 0.036
Basic load rating: 6350
Rated static load: 3700
Limit speed（Grease lubrication）: 11000
