Copyright © 2019, 2021, Hitachi, Ltd.
DKC910I
Hitachi Proprietary
[INST(IN)03-01-10]
Rev.1
INST(IN)03-01-10
3. Installing Rails
NOTE: Use the mounting holes of the rack that are level front to back and side to side when
installing the rails so that installed equipment and options are horizontally positioned.
Check the dimension from the inside of the front post to the outside of the rear post in the rack before
installing rails.
The length can be adjusted within an adjustment range of the rail kit.
• RRCB (Rail for DKC) is 660 mm - 920 mm.
• RRDB (Rail for SBX/UBX) is 600 mm - 750 mm.
• RRHSN (Rail for HSNBX) is 610 mm - 910 mm.
• RRDBF (Rail for FBX) is 600 mm - 900 mm.
• RRNB (Rail for NBX) is 680 mm - 860 mm.
Figure 3-1 Dimension from Front Post to Rear Post
EIA units and intervals of mounting holes of RKU rack frame conforming to EIA standard
•
A unit (U) space conforming to EIA standard is 44.5 mm as shown in the figure below.
• The boundary of the unit falls on the middle of the interval of 12.7 mm.
The boundary of the unit (1 U/1 EIA) is from the center of the interval of 12.7 mm to the center of the
next interval of 12.7 mm.
• For rack, hole size for rack installation is determined based on the EIA standard.
Hole size for rack installation :
Universal intervals: Repeat of 44.45 mm (15.875 mm + 15.875 mm + 12.7 mm)
Maximum number of mountable unit spaces: 40
Figure 3-2 Attachment Hole Size of Rack
Rack
Rack rear post
Rack front post
Dimension from
Front Post to Rear
Unit
boundary
1U = 44.45 mm
1 unit (EIA)
12.7 mm
31.75mm
15.875 mm
15.875 mm
12.7 mm
Unit
boundary