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Model: NACHI 7211CDB - Angular contact ball bearings (DB) back to back>
Bearing Size
d = 55D = 100
B = 21
a = -1.6
da1(min) = 64
da2(min) = 64
Da1(max) = 91
Da2(max) = 94.6
ra(max) = 1.5
ra1(max) = 1
Mass = 0.635
Basic load rating: 86500
Rated static load: 80000
Limit speed（Grease lubrication）: 8000
Limit speed（Oil lubrication）: 11000
