GB/T 47795-2026Casing types and fitting dimensions of watch movements (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

1 Scope

This document specifies the mounting method and fitting dimensions for watch movements.

This document applies to the design and assembly of mechanical watch movements, quartz watch movements, and the fixed structure of metal watch cases. Other watch movements or... For other materials used in the case, please refer to the guidelines.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 26693 Timing Instruments - Shape, Dimensions and Name of Watch Movements

GB/T 31896 Classification, Name and Numbering of Components for Timing Instruments - Watch Exterior Components

3 Terms and Definitions

The terms and definitions defined in GB/T 26693 and GB/T 31896, as well as the following terms and definitions, apply to this document.

4 Symbols

The following symbols apply to this document. a. Distance between the screw hole and the edge of the movement (Type I, Type II, Type III, Type IV, Type V). b2.Distance between the solid plate pressing platform (Type II). c1.Distance between the screw cap and housing groove (Type III). c2.Distance between the pressing grooves of the solid plate (Type IV, Type V). d1.Mechanism assembly diameter (Type I, Type II, Type III, Type IV, Type V, Type VI). d2.Outer diameter of the movement (Type III, Type IV, Type V, Type VI). d3.Diameter of the screw cap (Type I, Type III). d4.The diameter of the watch case aligning with the outer diameter of the movement (Type III, Type IV, Type VI). d5.Outer diameter of the mounting ring (Type V, Type VI). d6.The outer diameter of the watch case for locking the movement ring (Type V). d7.Nominal diameter of machine screw (Type I, Type II, Type III, Type IV, Type V). e. Shell protrusion length (Type I, Type II). f. Shell groove depth (Type III, Type IV, Type V).