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Model: NACHI 7006DB - Angular contact ball bearings (DB) back to back>
Bearing Size
d = 30D = 55
B = 13
a = 5.8
da1(min) = 35
da2(min) = 35
Da1(max) = 50
Da2(max) = 52
ra(max) = 1
ra1(max) = 0.6
Mass = 0.135
Basic load rating: 23600
Rated static load: 20300
Limit speed（Grease lubrication）: 8500
Limit speed（Oil lubrication）: 11000
