This International Standard specifies the metric port thread sizes corresponding to a recommended range of pneumatic cylinders.
Its purpose is to specify appropriate metric port sizes in relation to the bore. By complying with the port thread dimensions in-dicated, a suitable minimum piston speed will be ensured.
DS/ISO 7180:1989 history
1989DS/ISO 7180:1989 Pneumatic fluid power. Cylinders. Bore and port thread sizes