Hydraulic torque wrench: Information from Answers.com

Vibratory Hammer Bolting with a hydraulic torque wrench.

Flange bolting with hydraulic torque wrench.

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A hydraulic torque wrench is a tool designed to exert torque on a fastener to achieve proper tightening or loosening of a connection through the use of hydraulics. A torque wrench is applied to the nut either directly or in conjunction with an impact socket. Hydraulic torque wrenches apply a predetermined, controlled amount of torque to a properly lubricated fastener.

Four narrow clearance hydraulic torque wrenches on a flange.

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Hydraulic torque wrench

See also