FusionModule2000 Smart Modular Data Center
Installation Guide
B Common Screw Torques
Issue 02 (2018-03-31)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
303
B
Common Screw Torques
Application Scenario
Screw Specifications
Torque (Kgf·cm) (Tolerance:
±10%)
Board, module, or panel
installation
M2.5 captive screw
2.1–2.5
M3 captive screw
3.8–4.2
Captive
M2.5
3
M3
6
Guide rail installation
Cross recessed pan head
thread forming screw
M5 (GB/T 6560-1986)
30
Subrack or box-type
module installation
M3 screw assembly
(mounting ear)
6
M4 countersunk screw
(mounting ear)
12
M6 panel screw
20
Grounding
M4
14
M6
48
M8
120
Cabinet or chassis
installation, cable tray,
upper fastener, or
antiseismic enhancement
installation, cabinet
combination, or outdoor
cable clip
ST3.5 tapping screw +
plastic expansion sleeve
3
M4
12
Cross recessed pan head
thread forming screw M5
(GB/T 6560-1986)
30
M6
30
M8/M8 expansion bolt
(tension/implosion)
130