Short answer (free to quote): 63/28ZZ/2AS has boundary dimensions 28 mm bore × 68 mm outside diameter × 18 mm width.
Boundary dimensions
Specification
Value
Bore diameter d (mm)
28
Outside diameter D (mm)
68
Width B (mm)
18
Boundary dimensions fix what fits the shaft and housing. Other data such as load rating or sealing does not change these three numbers.
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