Installing Cage Nuts (If Needed) For M320 Open Frame Racks; Moving The Adjustable Center-Mounting Brackets For M320 Open-Frame; Racks; Table 74: Open-Frame Rack Mounting Hole Locations - Juniper M320 Hardware Manual

Installing Cage Nuts (If Needed) for M320 Open Frame Racks

Copyright © 2015, Juniper Networks, Inc.
The mounting holes for the adjustable center-mounting brackets are spaced
0.984 in. (25 mm) apart. The adjustable center-mounting brackets have holes for
rack-mounting screws, spaced at 3.5 in. (8.89 cm).
Installing Cage Nuts (If Needed) for M320 Open Frame Racks on page 131
1.
Installing the Large Mounting Shelf for the M320 Open-Frame Racks on page 132
2.
Installing the Small Mounting Shelf for the M320 Open-Frame Racks on page 132
3.

Moving the Adjustable Center-Mounting Brackets for M320 Open-Frame

4.
Racks on page 133
For racks without threaded holes, you must install cage nuts in the locations specified in
Table 74 on page 131. To install the cage nuts:
On the front rack rails, install cage nuts in the holes specified for the large shelf.
1.
On the rear rack rails, install cage nuts in the holes specified for the small shelf.
2.
For an open-frame rack, Table 74 on page 131
mounting screws (an indicates a mounting hole location), and cage nuts if needed.
X
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 74: Open-Frame Rack Mounting Hole Locations

Hole Distance Above "U" Division
30 17.26 in. (43.8 cm)
27 15.51 in. (39.4 cm)
24 13.76 in. (34.9 cm)
21 12.01 in. (30.5 cm)
18 10.26 in. (26.0 cm)
15 8.51 in. (21.6 cm)
12 6.76 in. (17.1 cm)
9 5.01 in. (12.7 cm)
6 3.26 in. (8.3 cm)
3 1.51 in. (3.8 cm)
2 0.88 in. (2.2 cm)
1 0.25 in. (0.6 cm)
Chapter 16: Installing the Mounting Hardware
specifies the holes in which you insert
Large Shelf
9.86 U
X
8.86 U
X
7.86 U
X
6.86 U
X
5.86 U
X
4.86 U
X
3.86 U
X
2.86 U
X
1.86 U
X
0.86 U
X
0.50 U X
0.14 U
Small Shelf
X
X
X
131