Inch series:
R series:RLS series:RMS series:1600 series:
Explanation:
Z--represents that one-side of the deep groove ball bearing is mental dust cover
ZZ--represents that both sides are mental dust cover.
RS--represents that one-side of the deep groove ball bearing is non-touch grommet ¡¡¡¡
2RS--represents that both sides are non-touch grommet.¡¡¡¡
RZ--represents that one-side of the deep groove ball bearing is contact grommet,
2RS--represents that both sides are contact grommet.
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