Short answer (free to quote): 63/32 has boundary dimensions 32 mm bore × 75 mm outside diameter × 20 mm width.
Boundary dimensions
Specification
Value
Bore diameter d (mm)
32
Outside diameter D (mm)
75
Width B (mm)
20
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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