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Model: NACHI 7211BDF - Angular contact ball bearings (DF) face to face>
Bearing Size
d = 55D = 100
B = 21
a = 22.1
da1(min) = 64
da2(min) = 60
Da1(max) = 91
Da2(max) = 94.6
ra(max) = 1.5
ra1(max) = 1
Mass = 0.635
Basic load rating: 78000
Rated static load: 74500
Limit speed（Grease lubrication）: 4000
Limit speed（Oil lubrication）: 5500
