ISO 3764:2016规定了机械和机电手表机芯的类型和装配尺寸。 本国际标准适用于以下五种运动: -1型:圆形； -2型:圆形； -3型:双刀圆形； -4型:5′； -5型:6×8′。

ISO 3764:2016 specifies the types and fitting dimensions of mechanical and electromechanical watch-movements. This International Standard is applicable to the five following types of movements: - Type 1: round; - Type 2: shaped round; - Type 3: round with double cutting; - Type 4: 5？′′′; - Type 5: 6 × 8′′′.