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The Encyclopedia of Horology

Component record · Keyless work

Stem (Winding Stem)

Verified

A slender steel shaft that passes through the case pendant, connecting the external crown to the internal keyless works.

What it does

Transmits the user's turning and pulling actions at the crown into the movement's winding and setting mechanisms.

How it works

The stem typically comes in two parts on modern watches — a movement-side winding stem and a case-side stem tube extension joined by a threaded or friction coupling — so the movement can be removed from the case without fully withdrawing the stem from the pendant.

A groove or shoulder near the stem's inner end engages the setting lever, so pulling the crown outward physically slides the stem, moving the setting lever and clutch to the setting position.

Evolution

The two-part (case clamp / movement stem) design became standard as wristwatch case construction diversified in the 20th century, since it allows movement removal for service without disturbing the case tube.

Known variations

  • One-piece stem (older and simpler designs)
  • Two-part stem with case clamp screw
  • Screw-down stems on water-resistant cases

Identification for collectors

  • A stem that pulls out without engaging any detent, or that will not stay in the wound position, indicates a worn setting lever spring or damaged stem groove

Common failure modes

  • Bent or broken stem, especially from impact
  • Stripped threads at the case-clamp joint
  • Worn groove failing to engage the setting lever

Photographs

Stem Winding and Setting Watch. - DPLA - 1690779f9826ae336aa2956bd1cf6bc0 (page 1)
Stem Winding and Setting Watch. - DPLA - 1690779f9826ae336aa2956bd1cf6bc0 (page 1) — Heidbrink, Bernard, Public domain. Wikimedia Commons file page
Stem Winding and Setting Watch. - DPLA - 1690779f9826ae336aa2956bd1cf6bc0 (page 2)
Stem Winding and Setting Watch. - DPLA - 1690779f9826ae336aa2956bd1cf6bc0 (page 2) — Heidbrink, Bernard, Public domain. Wikimedia Commons file page
Stem Winding and Setting Watch. - DPLA - 1690779f9826ae336aa2956bd1cf6bc0 (page 3)
Stem Winding and Setting Watch. - DPLA - 1690779f9826ae336aa2956bd1cf6bc0 (page 3) — Heidbrink, Bernard, Public domain. Wikimedia Commons file page

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. de Carle, D., Practical Watch Repairing

Where sources disagree, the disagreement is stated rather than resolved silently.