Short answer (free to quote): 6004 has boundary dimensions 20.0 mm bore × 42.0 mm outside diameter × 12.0 mm width.
Boundary dimensions
Specification
Value
Bore diameter d (mm)
20.0
Outside diameter D (mm)
42.0
Width B (mm)
12.0
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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