HP ProCurve 3400cl-48G Installation And Getting Started Manual page 37

2.
Partially install a screw
into the top hole of a
close (0.5-inch) pair on
both sides of the rack
3.
Lower switch with mounting
brackets onto the partially
installed screw
Partially install a screw (5/8-inch number 12-24) into the top hole of a pair
of holes that are 0.5 inches apart in each rack/cabinet upright as shown
in the illustration below. Ensure that the screws are at the same level in
each upright.
Place the switch in the rack and lower it so the notches in the bottom of
the bracket slide onto the screws, then tighten these screws.
Installing the Switch
Installation Procedures
2-17