Congratulations on your purchase of the SR-RH8D Hand. This hand is the result of years' experience in hand design and use, and it aims at incorporating everything a robot builder needs: reliability^3, ease of use and compatibility with existing robot platforms in both hardware and software.

When unpacking, please check your package contents.

For a single hand

  • 1x SR-RH8D Hand

For a Pair of Hands

  • 2x SR-RH8D Hands

Note: The Bluetooth interface and Capacitive Pads, if ordered, are installed inside the unit. They will not be visible from the outside.

If your ordered the PC Interface Board + Power and Data Hub + Power Supply

  • 1x Power Supply 12V
  • 1x USB to Serial converter cable. \\Typically, this will be a special 2-in-1 cable with miniaturized circuitry built inside the USB connector.
  • 1x Power and Data Hub board
  • 1x or 2x Long connection cable (depending on whether you ordered one unit or a pair or units)
  • 2x Short connection cables

The Long and Short connection cables are similar and can be interchanged if the user needs. The Long cable is usually used to connect to the main unit but this is not mandatory; any of the cables can be used.

The hand is assembled by means of 8 screws located on the back (“wrist”) position. These screws are designed with common spacing in mind, being compatible with assembly on Robotis Dynamixel Pro Series (such as used in Thor-Mang).

Assembly screws are already pre-assembled (in green). Remove them, including the washers. Pay attention to NOT remove the screws in red or any other screws as they are structural to the hand assembly.

The wrist rotation has aproximately 180º of range. Therefore, for correct assembly, rotate central hub so that triangle in center part aligns with top triangle in outer shell. This corresponds to neutral angle. Wrist will rotate 90 degrees left and right from this position.

Use the pre-assembled M2.5 bolts to mount the unit to your robot.

IMPORTANT: Bolts must enter the unit between 12mm and 16mm. Any longer will damage the internals of the unit and may prevent correct rotation of the Wrist; any shorter and appropriate fixation may not be provided.

After this step and without applying power, manually rotate unit to confirm assembly was performed correctly. If you feel any blockage within the 180 degree range, please consult with our technical team through the email support@seedrobotics.com before powering and using the unit.


  • When tightening screws do not press or push them in. Screws should be tightened by rotation only.
  • Use of the washers is recommended but not essencial, depending on the mounting bracket and your own individual needs.
  • Complete the assembly by connecting the appropriate cable to the main connector at the back of hand. See Connection Diagrams and Connector Pinouts

Copyright © 2015-2023 Seed Robotics Ltd

  • rh8d/unpacking_mechanical_assembly.txt
  • Last modified: 2021/06/15 12:00
  • by SeedR KB Admin