Dell External OEMR XL R720XD Technical Manual page 40

The static rails (shown in Figure 15) support a wider variety of racks than the sliding rails, but do not
support serviceability in the rack and are not compatible with the CMA.
One key factor in selecting the proper rails is identifying the type of rack in which they will be
installed. Both the sliding rails and the static rails support toolless mounting in 19"-wide, EIA-310-E
compliant square hole and unthreaded round-hole 4-post racks. Both also support tooled mounting
in threaded hole 4-post racks, but only the static rails, as the more universal solution, support
mounting in 2-post (Telco) racks.
Table 23 lists the rack rail systems that the R720 and R720xd support.
Rail
System
identifier
B6
R720/R720xd
B4
For detailed information about rail dimensions, see the Rack rail specifications section in Appendix A.
For more information on installing the T620 in a rack, see the
Support.Dell.com/Manuals.
PowerEdge R720 and R720xd Technical Guide
40
Mounting interface
ReadyRails II
ReadyRails
Rack types supported
Rail
4-post
type
Square Round
 
Sliding
 
Static
Rack Installation Instructions
2-post
Thread Flush Center
X X

  
on