The Universal Series only guarantees accuracy for positioning repeatability. (Backlash is also guaranteed for the US Series only.)
Ball screw specification (GL-N/TH direct motor coupling only): ±0.02 mm
Belt specification: ±0.08 mm
Positioning repeatability is not guaranteed for the motor wrap specification.
With correct timing belt tension, the positioning repeatability will be the same as that of the direct motor coupling specification.