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Made by Boca Bearing, the ceramic 50mm axle bearing spins freer and basically lasts forever. Part number UC210C50MM NB2 non-removable seal.
Bearing info: Bearing Material Chrome Steel 52100
Rolling Element Mat. Ceramic SI3N4
Dimension Type Metric
ID (d) 50
OD (D) 90
Width Inner Ring 51.6
Width Outer Ring 22
Insert Type Spherical-Curved OD
Locking Type Set Screw
Enclosure # Two Seals
Enclosure Material Chrome Steel
Enclosure Type Contact Seal
Retainer Material Chrome Steel
ABEC/ISO Rating ABEC#1/ISOP0
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