Torque Specifications For Rack Mounting; Chassis Location Requirements; Table 27 Typical Torque Values For Rack Mounting The Chassis - Alcatel-Lucent 7750 SR-a4 Installation Manual

Torque Specifications for Rack Mounting

Chassis Location Requirements

7750 SR-a4 and SR-a8 Installation Guide
Racks and rack-mounting screws are not supplied by Alcatel-Lucent. EIA-310 defines four
screw sizes: 10-32, 12-24, M5, and M6. Each screw size has a different typical torque value,
which can vary depending on the material used in the manufacture of the rack and screws.
Table 27 lists some typical torque values.
Warning: Always follow the rack manufacturer's instructions regarding screws and torque.
Table 27: Typical Torque Values for Rack Mounting the Chassis
Screw Size
10-32
12-24
M5
M6
Observe the following requirements when installing the system horizontally in the 19-in.
(482.6 mm) rack.
• Maintain clearance around the chassis as shown in the shaded areas in
as described in
• Ensure that the inlet and exhaust of the chassis is free of obstructions from cabling,
mounting hardware, or other electronic equipment in the area.
Typical Torque
18-20 lbf-in (2.03 to 2.25 N
24-28 lbf-in (2.71 to 3.16 N
20-22 lbf-in (2.25 to 2.48 N
34-38 lbf-in (3.84 to 4.29 N
Table 28.
Site Preparation
.
m)
.
m)
.
m)
.
m)
Figure 15 and
59