Lock Out Tool (LOT)

Lock Out Tool (LOT)

Subsea Completions
The TMT Lock Out Tool (LOT) is a mechanical locking device that is used to prevent subsea valves from closing after they've been opened and provides a mechanical means of locking the valve in a stroked position for a prolonged time. The tool consists of a splined rod that is actuated by the Linear Actuated Override Tool (sold separately) and an ROV operated locking handle.
The LOT has interchangeable components to enable interfacing with ISO 13628-8 Type A, Type B and Aker interfaces.
The LAOT can be engaged and disengaged from the LOT at any time by rotating the LAOT equipped with an ISO 1328-8 Type A linear interface (1/8 turn lock).
TMT can customise the tool to suit your requirements.


  • Mainly manufactures from AISI 630 Stainless Steel
  • The LOT can be modified at TMT for locking at any stroe length between 0.9 inches (23mm) and 7.875 inches (200mm)
  • Capable of providing two stroke lock positions
  • ISO Type A and Type B Detachable Heads
  • Aker Detachable Heads


Dimensions 444L x 386W x271Hmm
Max. Stroke 7.875" (200mm)
Weight in Air 46kg
Weight in Seawater 39.4kg