Dell PowerEdge R300 - Manual (Page 37)

Two-Post Rack Installation
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7 Slide the adjustable-mounting bracket so that it is against the back of vertical two-post rack and secure
it to the two-post rail with two 12-24 x 0.5-inch pan-head Phillips screws (see Figure 2-6).
8 Repeat step 6 and step 7 to install the right mounting rail in the rack.
9 Using a 3/8-inch wrench or nut driver, tighten the nuts on the adjustable mounting brackets on both
mounting rails.
Figure 2-6. Installing the Mounting Rails for Flush-Mount Configuration
1 two-post open-frame rack 2 12-24 x 0.5-inch pan-head
Phillips screws (4 per rail) 3 mounting rails (2)
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1
3