It will prevent rotating movements, but it will not be able to remain completely fixed.
CUPB is a product that uses friction fastening. In cases where oil, etc. adhered to the round pipe/round shaft causes the friction coefficient to decrease or if impact loads or vibrations occur, the maximum load weight may decrease.
The surface may be scratched depending on the material and surface finish of the round pipe/round shaft.
If excessive loads are applied, then the round pipe/round shaft may be scratched or CUPB may be damaged.
Take care to pay attention to the vertical orientation when mounting.
Tablet PC holders DTAC-PB using brackets for round pipes CUPB are available. DTAC-PB
Brackets for simple positioning when using aluminum frames/square shafts for vertical axes CUAB are available. CUAB