Sun Oracle Netra SPARC T3-1 Installation Manual page 61

5. (Optional) If your environment contains especially high vibrations, install the
rear plates to further secure the server to the rack.
The rear plates attach to the rear of the post and to one of the three sets of eyelets
on each side bracket, depending on the thickness of the post.
a. Using two of the M3 x 8 SEM screws for each rear plate, loosely install the
screws in one of the six positions on the rear plate.
The position varies depending on the thickness of the rail in the rack. For
example, the following figure shows where you would install the screws for the
optimum rack position on the rear plate.
Installing the Server 53