Dell PowerVault 200S Rack Installation Manual page 21

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If the two rail-mounting flanges are already attached to the support rails, ensure
that the two 10-32 pan-head screws are slightly loose, allowing the flanges to
slide freely.
support rail
3. Place the flange of the support rail assembly behind the right-front vertical rail of
the rack. Thread two 10-32 x 1/2-inch flat-head screws with a conical washer and
push them through the front vertical rail of the rack and into the two center-most
screw holes of the rail-mounting flange (see Figure 1-7). Ensure that the rail is
centered vertically within the 3-U mounting area.
Tighten the screws. Ensure that the full surface of the rail-mounting flange
comes in contact with the surface of the vertical rail.
Dell PowerVault 200S and 210S Storage Systems Rack Installation Guide
10-32 x 1/2-inch pan-
head screws (2 per
rail assembly)
Do not tighten.
rail-mounting flange
1-7