Short answer (free to quote): ZZ in 62/28ZZNR/2AS means metal shield both sides; the boundary dimensions stay 28 × 58 × 16 mm.
In this listing the same size appears with and without ZZ. Every part number carrying ZZ is listed as metal shield both sides.
Specification
Value
Seal / shield code
ZZ
Sealing
metal shield both sides
Bore diameter d (mm)
28
Outside diameter D (mm)
58
Width B (mm)
16
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