Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
Issue 10 July 2000
Spare Parts and Replacement Procedures 8 - 13
Table 8-D: Minimum Torque for Electrical Connections
Screw Size
Torque Values in In-Lb (or Ft-Lb)/Nm
Wire Connections
Head Tightened
Nut Tightened
Slotted
Machine
Hex /Socket
Cap
Slotted
Machine
Hex /Socket
Cap
Slotted
Machine/
Hex Cap
Socket Cap
In-Lb Nm In-Lb Nm In-Lb Nm In-Lb Nm In-Lb Nm In-Lb Nm
8-32
15
/2
15
2
19
2
19
2
19
2
23
2.3
10-24
21
2.5
21
2.5
27
3
27
3
27
3
33
4
1/4-20
50
5.5
50
5.5
65
8
65
8
65
8
80
9
5/16-18
-
-
100
11
-
-
135
15
135
15
165
19
3/8-16
-
-
108
20
-
-
240
27
240
27
290
33
7/16-14
-
-
280
32
-
-
385
44
385
44
465
55
1/2-13
-
-
500
56
-
-
585
66
585
66
710
80
5/8-11
-
-
(71)
96
-
-
(97)
131
(97)
131 (118) 160
3/4-10
-
-
(125) 170
-
-
(172) 233 (172) 233 (209) 283
Table 8-E: Torque and Minimum Yield Strength Values
for Mechanical Connections (Using Hex Head Cap Screws)
Cap Screw Diameter
(Inch)
Min. Yield Strength
Torque
Ft-Lb
UNRC
Nm
1/4
57,000
6
8
3/16
57,000
12
16
3/8
57,000
22
30
7/16
57,000
35
47
1/2
57,000
54
73
9/16
57,000
77
104
5/8
57,000
107
145
3/4
57,000
190
257
7/8
36,000
193
261
1
36,000
290
393
1-1/8
36,000
410
556
1-1/4
36,000
580
786
1-3/8
36,000
760
1030
1-1/2
36,000
1010
1370
