# 90mm Single Sprocket Shaft Assembly
### Single Sprocket Shaft Assembly Parts Required
| **PART NUMBER** | **DESCRIPTION** | **QTY.** |
| ------------------------------------------------------- | ---------------------------- | -------- |
| [REV-41-1323](https://www.revrobotics.com/rev-41-1323/) | 15MM SPACER | 1 |
| [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\* | 1 |
| [REV-41-1348](https://www.revrobotics.com/rev-41-1348/) | 5MM X 90MM HEX SHAFT | 1 |
### Single Sprocket Shaft Assembly Steps
| | |
| ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [
](#single-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.
Note: For the Mecanum Drivetrain Kit, replace the sprocket with a 24 Tooth Pulley
|
| 
| Slide a 15mm Spacer 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.
|
| 
| SINGLE SPROCKET ASSEMBLY COMPLETE
Repeat the above steps until there are two completed Single Sprocket Assemblies. Set aside for later.
|
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.revrobotics.com/duo-build/ftc-starter-kit-mecanum-drivetrain/90mm-single-sprocket-shaft-assembly.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.