# Why DAC42780045 Is Not the Same Part as DAC43800045

DAC42780045 and DAC43800045 look related in a catalog and do not interchange. DAC42780045 is 42 × 78 × 45 mm. DAC43800045 is 43 × 80 × 45 mm. The width may match; the bore and OD do not.

If the old stamp is only partly visible, measure the shaft (42 vs 43 mm is obvious with a micrometer) and the housing bore. Do not force a 43 mm unit onto a 42 mm shaft or leave a 42 mm unit loose in a 43 mm-class knuckle.

The DAC42780045 bearing listing states this size only. TFL Bearing publishes that warning so purchasing does not treat the two DAC codes as a typo of each other.