What is Screw Down Crown

What is Screw Down Crown

When looking at watch construction, the crown is an integral part. The crown may be an important aesthetic element of the watch, or it may be completely unnoticeable, but in any case it is essential from a technical point of view.

Of course, the crown plays an important role in the watch. For one thing, the crown connects the outside of the watch to the inside. It also helps you customize the day of the week, date and time. For mechanical watches, the crown is primarily responsible for winding the watch and keeping it running.

 The screw-down crown, most commonly found on diver's watches, works by turning the crown counter-clockwise to open it. Dating back to the 1920s, Rolex was the first watchmaker to use a screw-down crown. Rolex is famous for its great inventions, but the screw-down crown does not trace its origins to the brand. Rather, Rolex bought the idea from two of his watchmakers, Georges Perret and Paul Perregaux.

How does the screw-down crown work? The internal component of the watch ends with a tube that connects to the threads of the crown. "Unscrew" the crown to loosen the threads and open the crown for use. When the screw is loosened, the thread presses against the pipe and closes the gap with an O-ring seal from the inside.

The screw-down crown prevents water from entering. This crown creates an airtight space and closes the gaps around the watch that allow water and moisture to enter the watch.

In addition, screwing is the best way to prevent dust from entering the watch. Dust is an unwanted guest. If dust gets into your watch, it can stick to the parts and dry out the lubricant between them. As a result, watches are prone to minor damage. The screw-down crown cannot be unwind accidentally. Only by manually 'unscrewing' or 'screwing' the crown can you prevent accidental winding that could alter the watch settings.

 A common drawback of using screw-down crowns is that they can easily break if the screw-in torque is increased too much. This can easily break the watch threads and render the crown and watch unusable.

It's true that a screw-down crown is ideal for a diver's watch, but it only works if the crown is screwed in, and water will seep into the watch if the crown is unscrewed and submerged. 

Cronos also uses screw-down crowns on most of its watches. In this example we are looking at the Cronos Sub Diver Watch L6015. The timepiece features a sleek and sophisticated design with classic aesthetics, powered by an automatic movement. Great for diving enthusiasts.

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