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The Generic Patek Philippe Calibre 240 Winding Stem is an aftermarket replacement component specifically designed for the iconic ultra-thin automatic calibre 240 family, introduced in 1977. This precision-machined stainless steel stem serves as the crucial mechanical interface between the crown and the movement‘s keyless works, enabling both manual winding and accurate time-setting functions.
Wide 240 family compatibility – Designed for the entire Calibre 240 family, including base 240, 240 PS, 240 Q, 240 HU, 240 C LU, and many other complication variants.
Two‑position precision operation – Supports manual winding (position 1) and precise time‑setting (position 2) via the crown.
Stainless steel construction – Machined from durable stainless steel with precision-ground threads for excellent mechanical strength and long‑term wear resistance.
Cost‑effective restoration – Provides a readily available alternative to scarce and expensive genuine OEM parts for routine repair and maintenance.
Drop‑in replacement fit – Engineered as a direct‑fit substitution for worn or damaged original stems, requiring no modification to the movement’s keyless works.
| Parameter | Value |
|---|---|
| Caliber Family | Patek Philippe Calibre 240 (ultra-thin automatic, launched 1977) |
| Movement Diameter | 27.5 – 31 mm (depending on variant) |
| Movement Thickness | 2.53 – 4.76 mm |
| Movement Jewels | 27 – 33 |
| Movement Frequency | 21,600 vph (3 Hz) |
| Power Reserve | 48 hours |
| Crown Positions | 2 (winding / time-setting) |
| Material | Stainless steel |
| Product Type | Aftermarket replacement part |
| Unit Quantity | 1 piece per order |
Replacement of worn, damaged, or broken winding stems during professional servicing of Patek Philippe Calibre 240 watches, including Calatrava, Nautilus, Aquanaut, Golden Ellipse, Gondolo, and Twenty~4 models, as well as extra-thin perpetual calendars and world time references.
Servicing of complication variants such as 240 Q (perpetual calendar), 240 HU (world time), 240 C LU (celestial), and 240 SQU (skeletonized).
Independent watch repair centers and service workshops performing movement overhauls that require keyless works repair.
Restoration of vintage Patek Philippe timepieces from the 1980s onward where original stem threads are stripped, the stem is bent or broken, or crown functionality is compromised.
Q1: Is this winding stem an authentic genuine Patek Philippe part?
No, this is a generic aftermarket replacement product, not manufactured by Patek Philippe. It is designed to meet the compatible specifications for the Calibre 240 family and should not be confused with original factory components.
Q2: Which calibers is this generic stem compatible with?
It is compatible with the entire Calibre 240 family, including the base 240, 240 PS, 240 Q, 240 HU, 240 C LU, 240 SQU, and other complication variants, all of which share the same keyless works architecture. Always verify with your specific movement reference before purchase.
Q3: What is the quality of this generic replacement stem?
As a generic aftermarket product, quality can vary between suppliers. Our replacement stems are manufactured from stainless steel and designed to meet the mechanical specifications for reliable winding and time‑setting function. For museum‑grade restorations requiring absolute authenticity, genuine OEM parts are recommended; for routine servicing and daily‑wear restoration, a quality generic stem offers a practical solution.
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