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Model: NACHI 7311CDB - Angular contact ball bearings (DB) back to back>
Bearing Size
d = 55D = 120
B = 29
a = -4.4
da1(min) = 65
da2(min) = 65
Da1(max) = 110
Da2(max) = 114
ra(max) = 2
ra1(max) = 1
Mass = 1.45
Basic load rating: 142000
Rated static load: 121000
Limit speed（Grease lubrication）: 7300
Limit speed（Oil lubrication）: 10000
