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The Encyclopedia of Horology

Complication · Display

Torque Indicator

Partially verified

A display showing the quality of energy delivery (torque) from the mainspring.

Definition

A display showing the quality of energy delivery (torque) from the mainspring.

Historical origin

Distinct from power reserve; it shows 'how well' the watch is running, not 'how long'.

How it works

Measures the tension of the mainspring directly, often through a sensor on the barrel.

The indicator shows a 'green zone' where torque is most consistent for best timekeeping.

Pocket watch context

None.

Wristwatch context

Introduced by Richard Mille in modern high-performance horology.

Identification

  • A small scale marked with torque or Nmm (Newton-millimeters)

Servicing notes

Ensure the linkage between the barrel and the indicator is not binding.

General guidance only. Complicated mechanisms should be assessed and serviced by a qualified watchmaker or clockmaker specialist, not adjusted at home.

Diagram

balance wheel with timing screwsflat or overcoil hairspringregulator index
Schematic: balance, hairspring and regulator. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

Sources & references

  1. de Carle, D., Watch and Clock Encyclopedia
  2. Britten, F. J., Old Clocks and Watches and Their Makers
  3. Horological Journal (British Horological Institute), technical articles

Where sources disagree, the disagreement is stated rather than resolved silently.