Figure 1-2, Figure 1-3, Two-post, open-frame relay rack wide-hole spacing – Dell PowerEdge 2650 User Manual
Page 9
2-Post Rack Installation
1-5
Universal-Hole Spacing Racks
Industry-standard two-post racks with universal-hole spacing have an alternating pattern of
three holes per U with center-to-center hole spacing (beginning at the top hole of a 1-U
space) of 15.9 mm, 15.9 mm, and 12.7 mm (0.625 inch, 0.625 inch, and 0.5 inch) for the
front and back vertical column of holes (see Figure 1-2).
F i g u r e 1 - 2 .
Tw o - P o s t , O p e n - F r a m e R e l a y R a c k U n i v e r s a l - H o l e S p a c i n g
Wide-Hole Spacing Racks
Some two-post racks with wide-hole spacing have an alternating pattern of two holes per U
with center-to-center hole spacing (beginning at the top hole of a 1-U space) of 31.7 mm
and 12.7 mm (1.25 inches and 0.5 inch) for the front and back vertical column of holes (see
Figure 1-3).
F i g u r e 1 - 3 .
Tw o - P o s t , O p e n - F r a m e R e l a y R a c k W i d e - H o l e S p a c i n g
44 mm (1.75 inches) (1 U)
15.9 mm (0.625 inch)
12.7 mm (0.5 inch)
15.9 mm (0.625 inch)
15.9 mm (0.625 inch)
44 mm (1.75 inches) (1 U)
12.7 mm (0.5 inch)
31.7 mm (1.25 inches)