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Model: NACHI 7304DF - Angular contact ball bearings (DF) face to face>
Bearing Size
d = 20D = 52
B = 15
a = 2.9
da1(min) = 27
da2(min) = 25
Da1(max) = 45
Da2(max) = 47
ra(max) = 1
ra1(max) = 0.6
Mass = 0.15
Basic load rating: 30500
Rated static load: 20800
Limit speed（Grease lubrication）: 10000
Limit speed（Oil lubrication）: 13000
