https://www.mcmaster.com/sprockets/for-shaft-diameter~8mm/
Sprockets for 8 mm Shaft Diameter | McMaster-Carr
Choose from our selection of sprockets for 8 mm shaft diameter in a wide range of styles and sizes. In stock and ready to ship.
8 mm shaftsprocketsdiametermcmastercarr
https://www.conrad.com/en/p/joy-it-stepper-motor-nema17-05gm-nema17-05gm-1-68-nm-1-68-a-shaft-diameter-8-mm-2148836.html
Buy Joy-it Stepper motor Nema17-05GM Nema17-05GM 1.68 Nm 1.68 A Shaft diameter: 8 mm | Conrad...
Top Joy-it Selection | Order easily now: Joy-it Stepper motor Nema17-05GM Nema17-05GM 1.68 Nm 1.68 A Shaft diameter: 8 mm | Fast delivery | Reasonable prices