Lucent Lineage
®
2000 ECS Battery Plant H569-408
3 - 4 Installation
Issue 2 July 1996
Notes:
1. Slotted machine screws should be pan-head type.
2. Slotted machine and hex cap screws should be SAE Grade
2 steel or equivalent.
3. Socket cap screws should have 100,000 psi minimum
tensile strength.
4. Steel flat washers should be furnished under heads of
socket cap screws.
5. Ferrous screws and washers should have a corrosion
protective finish.
6. Locking means is required only for connections subject to
vibration. Belleville-type washers or jam nuts are the
preferred means.
7. For less than 1/4 inch thick tapped copper bars, use No. 8,
No. 10, or 1/4 inch machine screws to minimize applicable
torque. When larger size screws are required, provide
captive-type steel nuts or reduce torques.
8. Torque recommendations are also suitable for all non-
ferrous fasteners, except aluminum.
9. Where application permits, hex cap screws should be used.
Table 3-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)
