> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/duo-build/channel-drivetrain-build-guide/double-sprocket-shaft-assembly.md).
# Double Sprocket Shaft Assembly
### Double Sprocket Shaft Assembly Parts Required
| **PART NUMBER** | **DESCRIPTION** | **QTY.** |
| ------------------------------------------------------- | ---------------------------- | -------- |
| [REV-41-1324](https://www.revrobotics.com/rev-41-1324/) | 3MM SPACER | 2 |
| [REV-41-1326](https://www.revrobotics.com/rev-41-1326/) | THROUGH BORE BEARING - SHORT | 2 |
| [REV-41-1327](https://www.revrobotics.com/rev-41-1327/) | SHAFT COLLAR | 1 |
| [REV-41-1338](https://www.revrobotics.com/rev-41-1338/) | 10 TOOTH #25 SPROCKET | 2 |
| [REV-41-1348](https://www.revrobotics.com/rev-41-1338/) | 5MM X 90MM HEX SHAFT | 1 |
### Double Sprocket Shaft Assembly Steps
| | |
| ------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| 
| Add a Shaft Collar flush to the end of the 5mm x 90mm Hex Shaft.
Tighten the Shaft Collar.
|
|  | Slide a Through Bore Bearing – Short onto the shaft.
Note the smaller portion of the bearing faces towards the Shaft Collar.
|
|  | Slide a 3mm Spacer onto the shaft. |
|  | Slide a 10 Tooth # 25 Sprocket onto the shaft. |
|  | Slide a 10 Tooth # 25 Sprocket onto the shaft. |
|  | Slide a 3mm Spacer onto the shaft. |
|  | Slide a Through Bore Bearing – Short onto the shaft.
Note the smaller portion of the bearing faces away from the Shaft Collar.
|
|  | DOUBLE SPROCKET ASSEMBLY COMPLETE
Repeat the above steps until there are two completed Double Sprocket Assemblies. Set them aside for later.
|