User Manual

racks. Both also support tooled mounting in threaded hole four-post racks, but only the static rails, as the more “universal”
solution, support mounting in two-post (Telco) racks.
Table 20. Sliding and static rail configurations
Sliding and Static Rail
Product
Rail
Identifier
Mounting
Interface
Rail Type
Rack Types Supported
4–Post 2–Post
Square Round Thread Flush Center
PowerEdge
R350
A12 ReadyRails II Sliding √ √ √
1
X X
A8 ReadyRails Static √ √ √
1
√
1
√
1
1
Minor conversion required.
Note that screws are not included in either kit due to the fact that threaded racks are offered with a variety of thread
designations. Users must therefore provide their own screws when mounting the rails in threaded racks.
NOTE: Screw head diameter for the sliding rails must be 10 mm or less.
Other key factors governing proper rail selection include the spacing between the front and rear mounting flanges of the rack,
the type and location of any equipment mounted in the back of the rack such as power distribution units (PDUs), and the overall
depth of the rack. The static rails offer a greater adjustability range and a smaller overall mounting footprint than the sliding
rails. This is because of their reduced complexity and lack of need for CMA support.
Table 21. Rail adjustable range and rail depth specifications
Rail Adjustable Range and Rail Depth
Produc
t
Rail
Identifi
er
Chassis
configuration
Rail
Type
Rail Adjustable Range (mm)
Rail Depth
(mm)
Square
*
Round
*
Threaded
*
withou
t CMA
with
CMA
Min Max Min Max Min Max
PowerE
dge
R350
A12
2.5-inch Sliding 631 868 617 861 631 883 720 845
3.5-inch Sliding 681 868 667 861 681 883 770 895
A8 Static 608 879 594 872 618 898 622 -
*
Values represent the distance between the front and rear mounting flanges on the rack.
NOTE:
The adjustment range of the rails is a function of the type of rack in which they are being mounted. The Min/Max
values listed above represent the allowable distance between the front and rear mounting flanges in the rack. Rail depth
without the CMA represents the minimum depth of the rail with the outer CMA brackets removed (if applicable) as
measured from the front mounting flanges of the rack.
NOTE: 3.5"HDD configurations utilize a self-adjusting slide feature. To fully install the system, this feature requires extra
force during the last 50 mm travel.
Ready Rails II Sliding Rails for 4–Post Racks
● Support for tool-less installation in 19” EIA-310-E compliant square or unthreaded round hole four-post racks including all
generations of Dell racks.
● Support for tooled installation in 19-inch EIA-310-E compliant threaded hole four-post racks.
● Support full extension of the system out of the rack to allow serviceability of key internal components.
● Support for optional cable management arm (CMA).
● Minimum rail mounting depth without the CMA (2.5-inch configuration): 720 mm
● Minimum rail mounting depth without the CMA (3.5-inch configuration): 770 mm
● Minimum rail mounting depth with the CMA (2.5-inch configuration): 845 mm
● Minimum rail mounting depth with the CMA (3.5-inch configuration): 895 mm
● Square-hole rack adjustment range (2.5-inch configuration): 631-868 mm
32
Rack, rails, and cable management