Dell PowerEdge R640 Manual page 31

Table 17. Static and sliding rails
Sliding and static rail
Product Rail identifier Mounting
R640 B6
B4
Screws are not included in either kit as threaded racks are offered with various 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 following:
• Spacing between the front and rear mounting flanges of the rack
• Type and location of any equipment mounted in the back of the rack such as power distribution units (PDUs)
• 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 18. Static rails adjustability
Product Rail Rail type
identifier
R640 B6 Sliding
B4 Static
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.
Rail type
interface
ReadyRails II Sliding
ReadyRails Static
Rail adjustable range (mm) Rack types supported
Square
Min Max
630 883
608 879
Rack types supported
4-Post
Square Round
√ √
√ √
Round Threaded
Min Max Min
616 876 630
594 872 604
2-Post
Thread Flush
√ X
√ √
Rail depth—mm
Without
CMA
Max
897 714
890 622
Rack rails
Center
X
√
With CMA
845
N/A
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