Bearing Supplementary Designation
ZZ – Shield of pressed sheet steel on both sides of
the bearing
2RSH – Sheet steel reinforced contact seal of
acrylonitrile-butadiene rubber (NBR) on both sides of the bearing
2RS1 – Sheet steel reinforced contact seal of
acrylonitrile-butadiene rubber (NBR) on both sides of the bearing
CN – Normal internal clearance
C3 – Bearing internal clearance greater than normal
(CN)
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