HP E8400A C-Size VXI Mainframe User And Service Manual page 25

Chapter 2
4. Attach the support rails to the rack's inside vertical rails. The support
rails must be positioned behind the bottom channel nuts installed in
Step 3 (Figure 2-3). Use four channel nuts and the four 0.5x10-32
support rail-to-rack pan head screws to secure the rail.
position rail behind
bottom channel
nut
Figure 2-3. Attaching the Support Rails to the Rack.
0.5x10.32 pan head screws
Rack Mounting and Option Installation 25