What is a Screw Down Crown? Structure, Mechanism & How to Use It

The Screw Down Crown is a special component in watches that enhances water resistance. However, many people are still unaware of its structure and working mechanism. In this article, https://donghoreplica.vn/ will provide all the essential information about this crucial watch feature!

1. What is a Screw Down Crown?

A Screw Down Crown is a specially designed watch crown that can be tightly screwed into the case to enhance water resistance, especially in high-pressure environments such as deep-sea diving.

✔ Functions of the Screw Down Crown:

• Provides optimal water resistance in deep-sea conditions.
• Allows time and date adjustments, just like a regular crown.
• Enables manual winding for mechanical watches.

2. History of the Screw Down Crown

✔ 1926 – Invented by Paul Perregaux and Georges Perret.
✔ 1927 – Rolex acquired the patent and introduced the Rolex Oyster, the first water-resistant watch.
✔ Today – Used extensively in professional dive watches from Rolex, Oris, Seiko, Citizen, and more.

💡 The Screw Down Crown has become a standard feature in high-end dive watches, improving water resistance and protecting the internal movement.

3. Structure & Working Mechanism of a Screw Down Crown

3.1. Structure of the Screw Down Crown

The Screw Down Crown consists of four main components:

✔ Crown – The main part that the user operates.
✔ Crown Tube – Contains internal threading to secure the crown.
✔ Spring – Pushes the crown out when unscrewed.
✔ Rubber Gasket (O-Ring) – Prevents water and dust from entering the movement.

📌 This structure functions similarly to a bolt and nut system, ensuring a watertight seal when fully tightened.

3.2. How It Works

✔ When tightened, the rubber gasket compresses against the watch case, forming a waterproof seal.
✔ When loosened, the spring pushes the crown out, allowing for time and date adjustments.
✔ When fully locked, the watch achieves its maximum water resistance as specified by the manufacturer.

4. How to Use a Screw Down Crown Correctly

4.1. How to Unscrew the Crown

✔ Step 1: Rotate the crown counterclockwise to unlock it.
✔ Step 2: Pull the crown out to the appropriate position for adjustments:

• First position: Adjusts the time.
• Second position: Adjusts the date (if applicable).

4.2. How to Lock the Crown

✔ Step 1: Push the crown back into the watch case.
✔ Step 2: While pushing, rotate the crown clockwise until it is firmly locked.
✔ Step 3: Ensure the crown cannot be pulled out, confirming a proper seal for optimal water resistance.

📌 Note: If the crown is not properly screwed down, water may enter the watch, even if it has high water resistance.

5. Water Resistance Levels of a Screw Down Crown

🔹 When the crown is open: Water resistance is limited to 3ATM (basic splash resistance).
🔹 When fully screwed down: The watch achieves its manufacturer-specified water resistance (e.g., 100m, 200m, 300m…).

⚠ Important Reminders:

• Always screw down the crown before exposure to water.
• Do not adjust the crown underwater to prevent water from seeping into the movement.
• Regular maintenance ensures the rubber gasket remains effective in sealing the watch.

6. Conclusion

🔹 The Screw Down Crown not only enhances water resistance but also protects the internal watch movement from dust, moisture, and pressure.
🔹 If you own a dive watch or a high-water-resistance timepiece, always check and secure the crown properly to maintain its performance!

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