HP E840 A Series User And Service Manual page 28

5. Attach the rack mount adapters to the mainframe using the m5x8 pan
head screws provided. To mount the mainframe flush with the rack
front, begin with the 3rd hole from the front of the adapter (Figure
2-4).
With the standard adapters (Option 923), the mainframe can be recess
mounted up to 270.7 mm (10.6 inches), or extended out from the rack
up to 147.6 mm (5.8 inches) in 12.3 mm (approximately 1/2 inch)
increments.
The rack mount adapters for the VXI compliant and flush mount
options are also shown in Figure 2-4.
Recess Mount in 12.3
(~1/2 inch) Increments
m5x8 Pan Head
Screws
Standard
Adapter
Option 923
VXI Plug & Play
Compliant
Adapter
Option 925
Flush Mount
Adapter
Option 924
Figure 2-4. Attaching the Rack Mount Adapter to the Mainframe.
28 Rack Mounting and Option Installation Chapter 2