A bucking unit is equipment for assembling and disassembling threaded connections on oilfield tubulars and downhole tools. On the Shenlida continuous 360° model, hydraulic cylinders clamp both sets of tongs, and the main tongs can rotate continuously through any number of turns. Shenlida supplies five bucking unit configurations with different clamping arrangements and control options.

What work does it support?

The published Shenlida product descriptions cover oil casings, oil pipes, downhole pumps and tools, and threaded drilling-tool connections. Suitability depends on the selected machine, the workpiece and its connection requirements. A product-family name alone does not establish the diameter or torque capacity.

Main parts and control functions

  • Main and back-up tongs: clamp the connected parts and apply or resist rotation
  • Hydraulic power and controls: operate clamping, rotation and the movements specified for the selected machine
  • Torque control and records: available functions vary by configuration; confirm whether the system is included or optional
  • Supports and handling: confirm rails, stands and workpiece handling against the proposed layout

Two examples from the Shenlida catalogue

The continuous 360° bucking unit has automatic torque control and generates turns–torque, time–torque and rotation speed–time curves. The YNJ hydraulic bucking unit lists automatic torque control as an option. These details belong to those specific products and should not be assumed for every unit.

Information needed for equipment selection

Prepare the workpiece diameter, length, weight, connection type, required make-up and break-out torque, and available installation space. If clamping surface marks or torque records matter for your process, include those requirements in the enquiry.

Continue with the bucking unit selection guide, compare configurations, or contact Shenlida to discuss your application.