Dell S4048 Getting Started Manual page 8

Figure 3. Two-Post Center-Mount Configuration
Four-Post Threaded Configuration
To install the Dell ReadyRails system using the four-post threaded configuration, follow these steps.
1. For this configuration, remove the flange ear castings from each end of the ReadyRails assemblies.
Use a Torx driver to remove the two screws from each flange ear and remove each casting. Refer to
item 1 of the following figure. Retain the castings for future rack requirements.
2. For each rail, attach the front and rear flanges to the post flanges with two user-supplied screws at
each end. Refer to item 2 of the following figure.
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Install the Hardware