Hydraulic torque wrench

A torque wrench is applied to the nut either directly or in conjunction with an impact socket.

[1] The concept of a hydraulic powered torque wrench was first introduced on the market sometime in the early 1960s in a primitive form, and several key advances have been developed by manufacturers since that time which provided major advancements in the technology and usability of the tools far beyond the original concept tool.

Newer tools offer benefits such as lighter weights, smaller nose radius dimensions for fitting into tight spaces, use of exotic alloys, actuation triggers on the tool itself, multi-position reaction members, 360° × 360° hose swivels, and the ability to run multiple tools simultaneously from a single power pack.

There are two types of hydraulic torque wrenches: square drive and low profile.

Hydraulic torque wrenches typically offer accuracy of ±1-3% and have a high degree of repeatability making them well suited to applications where large bolts are involved and a high degree of accuracy is required.