Z= 84

Genuine Bosch drive (toothed) belt — part number 2604736003 (also listed as 2 604 736 003). This replacement belt is made for Bosch orbital sanders such as the GSS 28 and GSS 28 A, restoring the tool’s original drive engagement and sanding motion.

Key specifications: toothed/serrated design with Z = 84 teeth for positive engagement, nominal working length ~252 mm, sold as a single replacement belt. These dimensions match the original Bosch sizing so the belt meshes correctly with the sander’s pulleys and eccentric drive.

Why choose this part: it’s the original Bosch fitment for the GSS 28-series sanding drive train, made to the same form of component so you can get your sander back to factory performance quickly. Bosch power tool parts like this belt are the simplest direct fix when the sander’s drive slips or the sanding stroke degrades.

Browse our full range of Bosch sander parts.