Belt sanding machine for cleaning and grinding operations on round tubulars with diameters from 10 to 400 mm. The free belt slides on two vulcolan rollers mounted on a compensated fork which allows the roller to adapt to any deformation of the piece. Equipped with contrast group with grooved rubber roller that slides on an adjustable guide by handwheel according to the diameter of the tube. Available for large tubular support roller conveyors in line with the machine.