# Step 5: Attach the Arm Modules

> Attach the completed left and right arm modules to the torso shell with mounting plates 100_05A and 100_08A and 24 M4x30 Socket bolts.

- Page: https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/attach-left-and-right-arms/step-5
- Section: Asimov › Asimov 1 › Assemble Asimov 1 › Assemble › Torso Module › Attach Left + Right Arms
- Previous: [Step 4: Install the Speaker](https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/torso-assembly/step-4.md)
- Next: [Step 6: Attach the Torso to the Pelvis](https://docs.menlo.ai/asimov/1/build/assembly-steps/torso-module/attach-lower-half-and-wiring/step-6.md)

> [!IMPORTANT]
> **Assign actuator IDs before assembly**
>
> Assign and verify all 25 actuator IDs before assembling the robot. The robot will not work correctly with missing or incorrect IDs. IDs must be assigned one actuator at a time on the bench; you may need to disassemble the robot if you skip this step. See [Assign Actuator IDs](https://docs.menlo.ai/asimov/1/build/assembly-preparations/assign-actuator-ids.md).

## Parts needed

| Part | Count |
| - | -: |
| Torso assembly from Step 4 | 1 |
| Completed Left Arm Module | 1 |
| Completed Right Arm Module | 1 |
| `100_05A` left mounting plate | 1 |
| `100_08A` right mounting plate | 1 |
| M4x30 Socket bolt (carried with arm modules) | 24 |
| Threadlocker | As needed |

## Instructions

1. Set up part `100_01C` such that the neck is facing the ceiling and the waist is facing the ground.

2. Take part `100_05A` and align it with the left arm hole from the inner side of part `100_01C`. Then, take the left arm module and align **12 of** M4x30 Socket bolts carried with that arm with `100_01C` and `100_05A`. Lightly tighten all the bolts to secure all the parts together.

3. After the parts are aligned:

   > [!NOTE]
   >
   > **Not ready to apply threadlocker?**
   >
   > You can assemble without threadlocker while you check the fit, alignment, and orientation. When you are confident, disassemble as needed, apply threadlocker to the bolts, and reassemble them following these instructions.

   - remove **12 of** M4x30 Socket bolts one at a time in a star formation,
   - apply threadlocker,
   - then tighten them back to secure Part `100_01C` and part `100_05A` and the Left Arm Module together.

4. Take part `100_08A` and align it with the right arm hole from the inner side of part `100_01C`. Then, take the right arm module and align **12 of** M4x30 Socket bolts carried with that arm with `100_01C` and `100_08A`. Lightly tighten all the bolts to secure all the parts together.

5. After the parts are aligned:

   > [!NOTE]
   >
   > **Not ready to apply threadlocker?**
   >
   > You can assemble without threadlocker while you check the fit, alignment, and orientation. When you are confident, disassemble as needed, apply threadlocker to the bolts, and reassemble them following these instructions.

   - remove **12 of** M4x30 Socket bolts one at a time in a star formation,
   - apply threadlocker,
   - then tighten them back to secure Part `100_01C` and part `100_08A` and the Right Arm Module together.