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Understanding Gaskets In Watches And Why They Are Essential For Water Resistance

Early use of gaskets in watches dates to the 1920s which was a key milestone for the development of the screw-down crowns, and a sealed case for water resistance

Early use of gaskets in watches dates to the 1920s which was a key milestone for the development of the screw-down crowns, and a sealed case for water resistance
Aaron Jacob

06 October 2025 04:31 PM

Gaskets are fundamental yet often underestimated components that play a critical role in ensuring the structural integrity and water resistance of a watch. Typically made from materials such as rubber, silicone, or Teflon, these precision-engineered rings are strategically placed at key junctions, most commonly around the caseback, crystal, and crown to create airtight and watertight seals. In diving watches and high-performance timepieces, multiple gaskets are often used in combination to achieve higher pressure ratings, with each seal engineered to withstand specific environmental stresses. Serving a critical function in mechanical timepieces, gaskets also provide a seal protecting the timepiece’s delicate internal movements.

Early use of gaskets in watches dates to the 1920s which was a key milestone for the development of the screw-down crowns, and a sealed case for water resistance
The power reserve on this timepiece is 10-days, and the crown protector reduces the wear on gaskets and the possibility of water infiltration, hence meeting the stringent requirements of the Italian Navy commandos

Installation and Maintenance

Gasket installation is a highly delicate process that must be fitted precisely to ensure a tight seal, and any miscalculation or misalignment can compromise on the novelty’s performance. Watchmakers use specific tools and techniques to not only install but also achieve the highest level of precision. Time can take its toll on gaskets too and maintenance including cleaning and replacement of the gaskets can help prevent wear and tear to ensure the novelty’s top notch performance.

Early use of gaskets in watches dates to the 1920s which was a key milestone for the development of the screw-down crowns, and a sealed case for water resistance
Breitling’s Endurance Pro 44 Ironman uses a double gasket system; one gasket is placed inside the crown to seal against the tube, and the second gasket is usually inside the crown tube, creating another barrier when the crown is pushed in

Types Of Gaskets

Caseback Gaskets

Circular, yet designed to fit snugly into a groove in the watch case, these are usually made from rubber or silicone, which provides a good seal while also being resistant to wear and tear. The thickness and diameter of the gasket should match the watch case to ensure a proper fit. These gaskets can become compressed or worn, leading to a loss of their sealing properties.

Crown Gaskets

These are cylindrical shaped and designed around the stem of the crown. The shape and size should match the crown, ensuring a proper fit. Regular inspection and replacement can ensure optimum performance of the timepiece.

Early use of gaskets in watches dates to the 1920s which was a key milestone for the development of the screw-down crowns, and a sealed case for water resistance
MB&F’s Horological Machine N°11 has an innovative crown design involves two sets of gaskets, akin to a double airlock security system

 Importance Of Gaskets

Without gaskets, the timepiece’s internal components would be exposed to moisture, dust, and other particles leading to damages. The gasket plays a crucial role in ensuring the longevity and reliability of a luxury mechanical watch. Furthermore, the gasket’s role in maintaining the watch’s water resistance is crucial for watches that are used in challenging environments. Without a properly functioning gasket, the watch could be damaged by water leading to costly repairs or even total loss of the watch.

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Gaskets luxury watches mechanical watches water resistance