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Sinn U50 HYDRO

Sinn U50 HYDRO

Model: 1051.010

The Sinn U50 HYDRO, model 1051.010, is a high-performance diving watch featuring HYDRO Technology for exceptional underwater clarity, encased in bead-blasted German Submarine Steel, ensuring water resistance to 5000 m and durability in harsh conditions. Its design prioritizes readability, scratch resistance with the bezel featuring TEGIMENT Technology, and ergonomic crown placement at 4 o’clock, making it an ideal choice for divers seeking reliability and functionality.


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Sinn U50 HYDRO


Sinn U50 HYDRO
Model: 1051.010


Sinn’s 5000m men’s diving watch with HYDRO Technology.

  • Completely made of high-strength seawater-resistant German Submarine Steel
  • Tested based on European diving equipment standards and certified by DNV
  • Waterproof and pressure-resistant to 5000 m diving depth (= 500 bar), certified by DNV
  • HYDRO Technology for perfect readability even under water and freedom from reflection at any angle and completely free from fogging
  • Bezel with TEGIMENT Technology and therefore especially scratch-resistant
  • Functionally reliable from –20 °C up to +60 °C
  • Captive diver’s bezel with minute ratcheting
  • Crown at 4 o’clock to prevent pressure on the back of the hand
  • Sapphire crystal glass
  • Low pressure resistant


When impressive functionality, perfect readability and technological innovation come together, the result is a versatile and robust timepiece such as the U50 HYDRO – realised in a comfortably wearable size of 41 mm diameter!

One of the outstanding features of the U50 HYDRO is concealed inside the diving watch, meaning that its incredible effect becomes most evident underwater: HYDRO Technology. The benefits never fail to impress experienced users: reflection-free underwater readability from any angle, absolute freedom from fogging and – thanks to the special oil filling – water-resistant and pressure-resistant up to a diving depth of 5,000 m (=500 bar).

The watch focuses on a striking design with a display that concentrates on the essentials. It owes its outstanding suitability for everyday use to high-quality features with special materials, which ensure that the U50 HYDRO can withstand even the most adverse conditions. The case and crown are thus made of high-strength seawater-resistant German Submarine Steel. It is characterised by its extreme strength and exceptional non-magnetic properties. Another advantage that stands out for connoisseurs is its outstanding resistance to seawater. As a result, we have designed the rotating bezel to be captive in the case. Thanks to the use of TEGIMENT Technology to harden the surface of the bezel, it can also easily withstand high external stresses. The result: exceptional scratch resistance. The positioning of the crown at 4 o’clock also deserves special attention. This prevents pressure on the back of the hand – even during physically demanding activities.

Due to the aforementioned oil filling, this timepiece must be a quartz watch, as the oscillation of the balance in a mechanical watch would be unable to overcome the high friction resistance of a liquid medium. Nevertheless, watch lovers needn’t forgo the reliability typical of SINN – the long-lasting lithium battery used ensures reliable function at temperatures ranging from –20°C to +60°C. The battery also has an exceptionally long service life. The movement’s integrated EOL (end of life) function prevents the watch from stopping suddenly.

Whether for professional use or to cope with the demands of diving, the U50 HYDRO is perfect for such challenges – as has also been confirmed by independent classification company DNV. Sinn tests and certifies pressure resistance to a diving depth of 5000 m (= 500 bar) and temperature resistance and functionality in accordance with the European diving device standards.


Technical Details


Quartz Movement

  • Ronda 715 Li – SWISS MADE
  • Battery with extremely long service life
  • End of life function
  • 5 bearing jewels
  • Anti-magnetic as per DIN 8309
  • Functionally reliable from ‑ 20 °C to + 60 °C



  • Case made of German Submarine Steel, bead-blasted
  • Sapphire crystal glass in front, anti-reflective
    on both sides
  • Case back screw-fastened
  • Crown screwable
  • Meet the technical requirements for waterproofness, as set out in standard DIN 8310
  • Waterproof and pressure-resistant to 5000 m diving depth (= 500 bar), certified by DNV
  • According to the technical demands for the diving norm DIN 8306
  • Tested based on European diving equipment standards EN 250 / EN14143 and certified by DNV
  • Low pressure resistant



  • Hours, minutes, seconds
  • Date display
  • Diver’s bezel with minute ratcheting and luminous key mark
SINN Technologies
  • HYDRO Technology for perfect readability even under water and freedom from reflection at any angle and completely free from fogging
  • Bezel with TEGIMENT Technology, therefore especially scratch-resistant
  • Captive safety bezel


Dimensions and Weight

  • Case diameter: 41 mm
  • Band lug width: 20 mm
  • Case thickness: 11.8 mm
  • Weight without strap: 72 gramme


Dial and Hands

  • Matte black dial
  • Indices coated with luminescent colour
  • Hour, minute and second hand coated with luminescent colour



  • 3 years

Additional information

Weight 1 kg


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