Open-top high-torque stroking/bucking unit

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Forum Energy Technologies’ AMC double-top open (DTO), high-torque stroking (bucking/makeup/breakout) machine is designed for fast and accurate makeup and breakout of threaded connections on drilling tools, well completion assemblies and other oilfield related equipment, up to a maximum torque of 100,000 ft-lb.

The DTO high-torque stroking machine is powered and controlled by an AMC hydraulic power unit (HPU). Over the years, Forum has redesigned the HPU to incorporate customer feedback and industry requirements to improve user ergonomics, makeup accuracy and process cycle times. 

Optimized for efficiency and safety

The self-contained, free-standing, hydraulically powered torque machine consists of a fixed headstock and a traversing tailstock, which are available with an open-top feature to help ensure tools are loaded safely and efficiently.

The stocks feature hydraulically controlled clamp cylinders that can go from 3 to 18 in. OD, or up to the machine’s maximum diameter size, without the need to change jaws between sizes. This has proved to be beneficial since it can reduce downtime, while decreasing safety hazards associated with changing jaws manually.

The hydraulic system works at low working pressures, eliminating the need for high-pressure hoses and fittings, lowering component costs and improving safety to the customer.

All machines are delivered with a one-year OEM warranty for peace-of-mind operation. The system is robust enough to withstand virtually every environment, including extreme heat and cold temperatures for extended and prolonged workshop use.


  • Reduces nonproductive time (NPT)
  • Increases reliability
  • Decreases HSE risks
  • Reduces component requirements and saves downtime


  • Accurate graph reports on threaded makeups for full authentication and traceability
  • Calibrated to thread manufacturers’ guidelines and tolerances
  • Variable electrical supply
  • Oil cooler fitted as standard
  • Full OEM 12-month warranty