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Model: NACHI 7011DB - Angular contact ball bearings (DB) back to back>
Bearing Size
d = 55D = 90
B = 18
a = 11.9
da1(min) = 61
da2(min) = 61
Da1(max) = 84
Da2(max) = 86
ra(max) = 1
ra1(max) = 0.6
Mass = 0.42
Basic load rating: 50500
Rated static load: 52500
Limit speed（Grease lubrication）: 5000
Limit speed（Oil lubrication）: 6700
