Durapac Hydraulic Equipment

DBW Back-Up Wrenches

Magnetic back-up wrenches that hold the opposite nut or bolt head during high-torque bolting.

Models

DBW0-5/8", DBW0-13/16", DBW0-15/16", DBW1-1/16", DBW1-3/16", DBW1-1/4", DBW1-7/16", DBW1-5/8", DBW1-13/16", DBW2", DBW2-3/16", DBW2-1/4", DBW2-3/8", DBW2-9/16", DBW2-3/4", DBW2-15/16", DBW3-1/8", DBW3-1/2", DBW3-11/16", DBW3-7/8", DBW4", DBW4-1/8", DBW4-1/4", DBW4-1/2", DBW4-5/8", DBW5", DBW5-3/8", DBW5-3/4" (metric equivalents DBW16 - DBW145)

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Operating instructions (PDF) →

The DBW Series are back-up wrenches. They hold the opposite side of a nut or bolt so it can’t turn while the other side is torqued or loosened.

Embedded magnets keep the wrench in place, so hands stay clear of pinch points. When the job is done, a release screw frees the wrench without residual load.

They are widely used on ANSI and API flanges and work on any joint with nuts, bolt heads or studs. The bi-hex profile gives more positioning options, and the bodies are heat-treated steel.

Key Specifications

Imperial nut sizes: 5/8" – 5-3/4" (metric: 16 – 145 mm)
Maximum load: 56 – 67,532 Nm, depending on size
Embedded magnets for hands-free positioning
Release screw for removal with no residual load
Bi-hexagonal design; heat-treated high-strength steel
Special designs and sizes available on request

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