18
Torque guidelines for external cabinet fasteners
Fasten torque Nominal Torque(In-Ibs) Torque Range(In-Ibs)
Penta-head security bolt
100 80-120
3/8’’ bolt 550 500-600
Hand-hole cover bolt 150 170-210
Torque guidelines for external bushings mounting hardware
Fasten torque Nominal Torque
(In-Ibs)
Torque Range
(In-Ibs)
Low-voltage bushing, molded tri-clamp(without
clamp ring), 3/8’’ mounting studs
60 40-80
Low-voltage bushing, molded tri-clamp(with clamp
ring), 3/8’’ mounting studs
120 90-150
Low-voltage bushing, porcelain (with clamp ring),
1/2’’ mounting studs
80 70-90
High-voltage bushing, molded tri-clamp (without
clamp ring), 3/8’’ mounting studs
60 40-80
High-voltage bushing, molded (with clamp ring), 3/
8’’ mounting studs
120 90-150
High-voltage bushing, porcelain
80 70-90
Torque guidelines for external bushing terminal connections
Terminal type Nominal Torque(In-Ibs)
**
Torque Range(In-Ibs)
High-voltage molded bushing insert*
180 170-190
High-voltage porcelain bushing eye-
bolt
210 180-240
High-voltage porcelain bushing end
cap
168 156-180
Low-voltage bushing, 5/8’’ jam nut
600 480-720
Low-voltage bushing, 1’’ jam nut
600 480-720
Low-voltage bushing, 1-1/4’’ jam nut
720 600-840
*Apply silicone grease before installation according to the insert manufacturer’s instructions.
**When checking tightness of gasketed components, the measured torque will normally be
less than the nominal torque listed in the table above due to relaxation of the gasket material.
Additional tightening of bushing mounting hardware may cause the component to crack or
the gasket to become over-compressed.
7 Service Preparation User Manual
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