Dell PowerVault 720N Installation And Troubleshooting Manual page 36

2-6 Dell PowerVault 720N, 740N, and 760N Installation and Troubleshooting Guide
Whole-U Alignment
rack vertical rail
conical washer
10-32 x 0.375-inch
countersunk screws
1-U spacing mark
d. At the back of the rack, secure the rack adapter rail to the rack's vertical rail
using two 10-32 x 0.375-inch screws and conical washers.
If you used hole numbers 1 and 5 at the front of the rack, hole numbers
8 and 10 will align to holes on the vertical rail (for whole-U alignment).
If you used hole numbers 2 and 6 at the front of the rack, hole numbers 7 and
9 will align to holes on the vertical rail (for half-U alignment). See Figure 2-3.
e. Using a torque-measuring wrench, tighten the rack adapter rail to the vertical
rail to 27 inch pounds (3.0 newton meters).
Figure 2-4 shows the rack adapter rails properly positioned in the rack.
rack adapter rail
Half-U Alignment