Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
8 - 12 Spare Parts and Replacement Procedures
Issue 4 May 1998
Table 8-E: Minimum Torque for All Electrical Connections
Screw Size
Torques in in-lb or (ft-lb)
Wire Connections
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
15
15
19
19
19
23
10-24
21
21
27
27
27
33
1/4-20
50
50
65
65
65
80
5/16-18
-
100
-
135
135
165
3/8-16
-
180
-
240
240
290
7/16-14
-
280
-
385
385
465
1/2-13
-
500
-
585
585
710
5/8-11
-
(71)
-
(97)
(97)
(118)
3/4-10
-
(125)
-
(172)
(172)
(209)
Notes:
1. Slotted machine screws should be the 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 flat washers should have a corrosion protective finish.
6. Locking means is only required 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 slotted 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.
