What does Z mean on a 60/28Z bearing?

Short answer (free to quote): Z in 60/28Z means metal shield one side; the boundary dimensions stay 28 × 52 × 12 mm.

In this listing the same size appears with and without Z. Every part number carrying Z is listed as metal shield one side.

Specification	Value
Seal / shield code	Z
Sealing	metal shield one side
Bore diameter d (mm)	28
Outside diameter D (mm)	52
Width B (mm)	12

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