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Model: NACHI 7304BDB - Angular contact ball bearings (DB) back to back>
Bearing Size
d = 20D = 52
B = 15
a = 7.6
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: 28900
Rated static load: 19800
Limit speed（Grease lubrication）: 9000
Limit speed（Oil lubrication）: 12000
