Lucent Technologies 1200A 24V ECS Battery Plant J85500E-2
5 - 4 Installation
Issue 7 October 1998
Table 5-A: Minimum Torque For All Electrical Connections
Screw Size
Torques - lb-in Or (lb-ft)
Wire Connectors
Head Tightened
Nut Tightened
Slotted
Machine
Hex or
Socket Cap
Slotted
Machine
Hex or
Socket Cap
Slotted
Machine or
Hex Cap Socket Cap
8-32
10-24
1/4-20
5/16-20
3/8-16
7/16-14
1/2-13
5/8 -11
3/4-10
15
21
50
-
-
-
-
-
-
15
21
50
100
180
280
500
(71)
(125)
19
27
65
-
-
-
-
-
-
19
27
65
135
240
385
585
(97)
(172)
19
27
65
135
240
385
585
(97)
(172)
23
33
80
165
290
465
710
(118)
(209)
Table 5-B: Torque and Minimum Yield Strength for
Mechanical Connections (Using Hex Head Cap Screws)
Cap Screw
Diameter
Grade 2
Minimum Yield
Strength (PSI)
Torque (Ft-Lb)
UNRC
1/4
3/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/ 8
1-1/4
1-38
1-1/2
57,000
57,000
57,000
57,000
57,000
57,000
57,000
57,000
36,000
36,000
36,000
36,000
36,000
36,000
5
12
22
35
54
77
107
190
193
290
410
580
760
1010