Table 110 on page 258 specifies the holes in which you insert screws to install the mounting hardware in
an open-frame rack (an X indicates a mounting hole location). The hole distances are relative to one of the
standard U divisions on the rack. For reference, the bottom of all mounting shelves is at 0.04 in. (0.02 U)
above a U division.
Table 110: Mounting Hardware Hole Locations for Front-Mounting in an Open-Frame Rack
Large ShelfDistance Above U DivisionHole
X9.86 U17.26 in. (43.8 cm)30
X8.86 U15.51 in. (39.4 cm)27
X7.86 U13.76 in. (34.9 cm)24
X6.86 U12.01 in. (30.5 cm)21
X5.86 U10.26 in. (26.0 cm)18
X4.86 U8.51 in. (21.6 cm)15
X3.86 U6.76 in. (17.1 cm)12
X2.86 U5.01 in. (12.7 cm)9
X1.86 U3.26 in. (8.3 cm)6
X0.86 U1.51 in. (3.8 cm)3
X0.50 U0.88 in. (2.2 cm)2
0.14 U0.25 in. (0.6 cm)1
To install the large mounting shelf (see Figure 57 on page 259):
1. On the rear of each rack rail, install cage nuts, if needed, in the holes specified in Table 110 on page 258
for the large shelf.
2. Partially insert a mounting screw into the highest hole specified in Table 110 on page 258.
3. Hange the shelf over the mounting screws using the keyhole slots located near the top of the large
shelf flanges.
258
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