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The Sinn U50 is a 41 mm mechanical dive watch with a stated pressure resistance of 500 m (50 bar), a 20 mm lug width and a captive, luminous-marked diver’s bezel. Sinn’s documentation describes its construction and testing; those published specifications are not a substitute for an independent dive test. The U50 is also a family of variants, so details such as coating and supplied strap depend on the exact model.
What are the Sinn U50’s core specifications?
Sinn’s technical sheet lists these specifications for the U50. The retrieved passage does not name the movement caliber or provide a power reserve or accuracy tolerance.
| Specification | Sinn’s published details |
|---|---|
| Case diameter | 41 mm |
| Band-lug width | 20 mm |
| Case material | German Submarine Steel; bead-blasted finish |
| Crystal | Sapphire, with anti-reflective treatment on both sides |
| Movement | Self-winding mechanical; 28,800 semi-oscillations per hour; seconds-stop function |
| Functions | Hours, minutes, seconds and date |
| Bezel | Captive diver’s bezel with minute ratcheting and a luminous key mark |
| Case construction | Screw-fastened case back and screw-down crown |
| Stated pressure resistance | 500 m (50 bar), according to Sinn |
Source: Sinn U50 technical sheet.
How large is the U50?
The case measures 41 mm across, with 20 mm between the band lugs, according to Sinn’s technical sheet. Diameter and lug width are useful starting points when comparing dimensions or looking for a replacement strap, but they do not establish how the watch will sit on a particular wrist. The published passage does not give a thickness or lug-to-lug measurement.
The 20 mm lug width is not a guarantee that every 20 mm aftermarket strap or bracelet will fit correctly. End links, spring bars, clasp and the specific U50 variant can affect compatibility; the official material does not certify third-party accessories.
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What does Sinn say about the 500 m rating?
Sinn describes the U50 as water- and pressure-resistant to a diving depth of 500 m (50 bar), tested and certified by an independent institute. Its technical sheet also lists the technical demands of DIN 8306 and the water-resistance requirements of DIN 8310. These are manufacturer-published claims, not an independent assessment here of the certificate or a real-world dive test.
Sinn’s 2025–2026 catalogue names DNV as the organization that verifies and certifies series pressure resistance to 500 m, as well as temperature resistance and functionality in accordance with EN250 and EN14143. This describes the manufacturer’s account of certification; it does not establish that every individual watch has been independently inspected for this article. See the Sinn 2025–2026 catalogue.
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How do the U50 variants differ?
Sinn’s 2025–2026 catalogue presents several U50 family models. Its descriptions and pictured configurations distinguish finishes, dial treatment and straps or bracelets; these details should not be treated as proof of current stock or of every watch’s supplied configuration.
| Variant | Catalogue-described distinction |
|---|---|
| U50 | Standard presentation; the technical sheet specifies a TEGIMENT-treated bezel. The catalogue pictures it with a black silicone strap. |
| U50 SDR | Black hard coating on a TEGIMENT basis on the bezel; pictured with a steel bracelet. |
| U50 S | Black hard coating on a TEGIMENT basis; pictured with a red silicone strap. |
| U50 DS | Decorative dial grinding and TEGIMENT technology on case and bezel; catalogue-limited to 1,000 pieces. |
The variant distinctions above reflect the 2025–2026 catalogue and may not describe the current lineup or availability. Check the exact reference and seller’s configuration before relying on a particular coating, dial, strap or bracelet. Sinn lists TEGIMENT technology on the standard U50 bezel; do not assume that all variants share the same treatment across the case and bezel.
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What is not established by the published specifications?
- The retrieved technical passage does not identify the movement caliber, its power reserve or an accuracy tolerance.
- The stated pressure resistance and certification details are Sinn’s published account; the certificate itself and independent dive-test results are not established here.
- The 2025–2026 catalogue’s U50 DS limit of 1,000 pieces is not confirmation of how many remain available.
- The cited materials do not establish current prices, inventory or regional availability.
- They do not verify fit for a particular third-party strap, bracelet, clasp or end link.
The U50 Hydro is a separate product, not another name for the U50. Its specifications should not be transferred to the U50.
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
