Lucent Technologies Lineage
®
2000 ECS/GPS Battery Plant J85500G-2
4 - 4 Installation Issue 6 May 1999
Table 4-A: Minimum Torque For All Electrical
Connections (e.g. Bus Bars)
Screw Size
Torques - Lb-in Or (Lb-ft)
Wire Connectors
Mechanical
Connectors
8-32 15 19
10-24 21 27
1/4-20 50 65
5/16-18 100 135
3/8-16 180 240
7/16-14 280 385
1/2-13 (42) (49)
5/8-11 (71) (97)
3/4-10 (125) (172)
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.
Bellevile-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 torque.
8. Torque recommendations are also suitable for all non-ferrous fasteners,
except aluminum.
9. Where application permits, hex cap screws should be used.
Table 4-B: Torque For All Non-Electrical Connections (e.g.
Floor Anchors)
Cap Screw Diameter Torque (Ft-Lb) UNRC
1/4 6
3/16 12
3/8 22
7/16 35
1/2 54
9/16 77
5/8 107
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