====== Rolex 3131 ======
The calibre **Rolex 3131** is a [[self-winding]] movement with bi-directional winding, 28,800 A/h, 31 [[jewels]], [[Glucydur]] [[balance wheel]] with Microstella screws and [[Kif]] [[shock protection]].

The Rolex 3131 is a new version of the Calibre [[Rolex 3130]] with [[Parachrom blue]]-[[Breguet hairspring]]. In contrast to the calibre [[Rolex 3135]] it lacks the date mechanism.

It is used in the [[Rolex Milgauss 116400|Milgauss Ref. 116400]].


<WRAP ud ud_mov>

**Manufacturer:**
  * [[Rolex]]

**Description:**
  * [[Self-winding]] movement, bi-directional winding
  * [[Chronometer]] certificate ([[COSC]])
  * [[Escapement]] Stone lever
  * [[Yoke winding system]]
  * [[Parachrom blue]]-[[Breguet hairspring]]
  * [[Glucydur]] [[balance wheel]] with Microstella screws for [[precision adjustment]]
  * Kif [[shock protection]]
  * [[Antimagnetic]], in [[http://en.wikipedia.org/wiki/Faraday_cage|Faraday cage]]

**Functions:**
  * [[Central seconds]]
  * [[Hacking seconds]]

**Data:**
  * 12½ [[ligne]]s
  * D 28.5 mm, H 5.37 mm
  * 31 [[jewels]]
  * 28,800 A/h
  * Power reserve 48h

**Production period:**
  * Since [[2007]]
</WRAP>

{{tag>Movements Automatic_movements Rolex_calibres}}