ISO 10552:2014 PDF

Overview

ISO 10552:2014 - Timekeeping instruments - Crowns and sealed tubes - Designs and dimensions defines standardized designs, dimensions and tolerances for crowns and sealed tubes used in water‑resistant wristwatches. It applies to mechanical, electromechanical and electronic watches and sets dimensional relationships, manufacturing limits and designation conventions to ensure interchangeability, sealability and quality in horology components.

Key topics and technical requirements

• Scope: Dimensions and tolerances for crowns (types 1, 2, 3) and sealed tubes (types 1–4) for water‑resistant wristwatches.
• Tolerances: Specified in accordance with ISO 286‑1 (tolerance system for linear sizes).
• Gasket and tube relationships:
  • Inside diameter of crown gaskets (types 1 & 2) shall be 0.20 mm to 0.25 mm smaller than the sealing tube diameter.
  • Minimum crown countersink depth (P) must be greater than the sealed tube length (l).
• Material and construction notes:
  • Tubes with wall thickness