Establishes metric mounting dimensions for cylinders as required for interchangeability of commonly used hydraulic cylinders. Includes the bore sizes as follows: 8, 10, 12, 16, 20, 25 mm. Gives the following mounting styles: MR3, MP3, MS3, MF8 (tables 2 and 3, figures 2 and 3). Figure 1 and table 1 contain the basic dimensions.