A Comprehensive Glossary of Mechanical and Automatic Watch Components

A Comprehensive Glossary of Mechanical and Automatic Watch Components

Mechanical and automatic watches are not just timekeeping instruments; they are intricate mechanical marvels that combine artistry and engineering. Each component plays a vital role in ensuring accurate timekeeping and the seamless operation of the watch. In this SEO optimized blog article, we embark on a journey through the world of horology, exploring a comprehensive glossary of the essential parts that bring mechanical and automatic watches to life.



The escapement is the heart of a mechanical watch, regulating the release of energy from the mainspring and controlling the movement of the gears. It includes the pallet fork and the escape wheel, ensuring that the energy is released in precise intervals, creating the ticking motion of the watch.

Balance Wheel:

The balance wheel oscillates back and forth, driven by the escapement. It acts as a timekeeping element, and its controlled motion ensures accurate timekeeping by allowing the gear train to advance in consistent increments.


The mainspring is the energy source of a mechanical watch. It is wound either manually or automatically and stores potential energy, which is gradually released to power the movement of the watch.

Gear Train:

The gear train transmits the energy from the mainspring to the escapement and balance wheel. It consists of a series of gears that work together to regulate the speed and motion of the watch's hands.


The crown is the small knob on the side of the watch case used to wind the mainspring, set the time, and adjust various functions. In mechanical watches, winding the crown stores energy in the mainspring.


In automatic watches, the rotor is a semicircular weight that moves with the motion of the wearer's wrist, winding the mainspring through a series of gears. This eliminates the need for manual winding and keeps the watch running as long as it is worn.


Jewels are small synthetic gemstones, usually made of rubies or sapphires, placed at strategic points in the movement. They reduce friction and wear between moving parts, ensuring smooth operation and longevity of the watch.


The dial is the face of the watch, featuring hour markers, numerals, and hands. It provides a visual representation of the time and serves as a canvas for various artistic and decorative elements.


Watch hands indicate the hours, minutes, and seconds on the dial. They are mounted on the central arbor and move in a circular motion, pointing to the corresponding time markers.


Complications are additional functions or features beyond basic timekeeping. Examples include chronographs (stopwatches), moon phase displays, tourbillons (rotating escapement), and perpetual calendars.

Bridges and Plates:

Bridges and plates are flat metal pieces that hold various components of the movement in place. They provide structural support and contribute to the stability and durability of the watch.

Balance Spring (Hairspring):

The balance spring is a fine coiled spring attached to the balance wheel. Its elasticity controls the oscillation of the balance wheel, ensuring consistent and accurate timekeeping. The balance spring's role in regulating the watch's beat is paramount.

Pallet Fork:

The pallet fork works in conjunction with the escape wheel in the escapement mechanism. It controls the release of energy from the escapement, allowing the gear train to advance in precise intervals.

Escapement Wheel:

The escapement wheel is connected to the pallet fork and is responsible for transferring energy from the gear train to the balance wheel, regulating the release of energy and creating the watch's ticking motion.

Main Plate:

The main plate is the foundational base of the movement, serving as the framework onto which all other components are mounted. It provides structural integrity and houses the various gear trains and bridges.

Subsidiary Dials (Subdials):

Subdials are smaller secondary dials within the main dial that display additional information or complications. Common examples include chronograph counters, small seconds, and day/night indicators.

Chronograph Pushers:

Chronograph pushers are buttons located on the side of the case that control the start, stop, and reset functions of a chronograph (stopwatch) complication.

Date Wheel:

The date wheel is a rotating disc with numerals representing the days of the month. It is controlled by the date mechanism and advances the date display at midnight.

Côtes de Genève:

Côtes de Genève, or Geneva Stripes, is a decorative finishing technique applied to bridges and plates. It involves parallel lines engraved into the metal, creating an elegant and visually appealing pattern.


Perlage, also known as circular graining, is a finishing technique that involves creating a pattern of small overlapping circles on the surface of bridges and plates. It adds texture and enhances the aesthetics of the movement.

Rotor Bearing:

The rotor bearing supports the rotor in automatic watches, allowing it to rotate freely with the motion of the wearer's wrist, thereby winding the mainspring.

Clous de Paris:

Clous de Paris, or hobnail pattern, is a textured finish often found on watch dials or bezels. It features a grid of small pyramidal shapes, adding visual interest and a tactile element.

Moon Phase Display:

A moon phase display is a complication that tracks the lunar cycle by displaying the phases of the moon on a subdial. It adds a touch of celestial elegance to the watch dial.

Power Reserve Indicator:

The power reserve indicator is a complication that displays the amount of energy left in the mainspring, indicating how much time the watch will continue to run before requiring winding.

Rotor Bridge:

The rotor bridge secures the rotor in an automatic movement, ensuring its smooth rotation and efficient winding of the mainspring.

Shock Absorber:

A shock absorber is a mechanism that protects the delicate components of the movement from sudden impacts, ensuring the watch remains accurate even when subjected to shocks.


The barrel houses the mainspring, storing the potential energy that powers the movement. As the mainspring unwinds, it transfers energy to the gear train.

Screw-Down Crown:

A screw-down crown provides enhanced water resistance by sealing the crown to the case. It is commonly found in dive watches and other water-resistant models.

Push-to-Set Mechanism:

A push-to-set mechanism allows the wearer to adjust the time or date by simply pressing the crown, facilitating quick and convenient adjustments.

Breguet Overcoil:

The Breguet overcoil is a specialized shape given to the balance spring's terminal curve. It improves isochronism by ensuring even distribution of tension throughout the spring's oscillations.

Slide Rule Bezel:

A slide rule bezel features logarithmic scales that allow for complex mathematical calculations, making it a functional tool on certain pilot and aviation watches.


The rehaut is the ring between the dial and the crystal. It often features minute markers and can also accommodate additional information, such as a tachymeter scale.

Luminous Material:

Luminous material, commonly Super-LumiNova, is applied to the hands, markers, and other elements of the dial. It absorbs light and emits a glow in low-light conditions.

Hacking Feature:

A hacking feature stops the seconds hand when the time is being set, allowing for precise synchronization with a reference time.

Quick-Release Strap System:

A quick-release strap system allows easy removal and attachment of watch straps, enabling users to change the strap to match different occasions.

Perpetual Calendar:

A perpetual calendar complication automatically accounts for varying month lengths and leap years, ensuring accurate date display without manual adjustment.

GMT (Greenwich Mean Time) Hand:

A GMT hand indicates a second time zone on the dial. It is typically paired with a rotating 24-hour bezel or an additional 24-hour subdial.

Moon Phase Indicator:

A moon phase indicator displays the lunar cycle, showing the waxing and waning of the moon's phases as they appear in the sky.

Tourbillon Cage:

The tourbillon cage is a rotating carriage that holds the escapement and balance wheel. It was designed to counter the effects of gravity on accuracy.

Rotor Winding Direction:

In automatic movements, the rotor's winding direction can be unidirectional (winding in one direction) or bidirectional (winding in both directions).

Column Wheel:

A column wheel is a component in chronograph movements that controls the start, stop, and reset functions of the chronograph mechanism.

Foudroyante (Flying Seconds) Hand:

A foudroyante hand is a specialized hand on a chronograph that rotates rapidly around the dial, measuring fractions of a second.

Geneva Seal (Poinçon de Genève):

The Geneva Seal is a prestigious quality hallmark that certifies the exceptional craftsmanship and finishing of a watch movement, particularly in Geneva.

Lépine Caliber:

A Lépine caliber is a movement design in which the crown is located at 12 o'clock, allowing for a slimmer and more elegant case profile.


As we venture deeper into the realm of mechanical and automatic watch components, we uncover the intricate world of horological engineering and artistry. Each of these parts, whether hidden from view or showcased on the dial, contributes to the functionality, aesthetics, and enduring appeal of these timepieces.

From the delicate Breguet overcoil to the ingenious perpetual calendar, each component weaves its thread into the tapestry of watchmaking excellence. As you explore this comprehensive glossary, you'll gain a newfound appreciation for the complexities and ingenuity that define mechanical and automatic watches, truly marveling at the fusion of human creativity and technical precision.