This part of ISO 3019 specifies sizes and dimensions and establishes an identification code for the two- and four-bolt mounting flanges and the shaft ends of positive-displacement, rotary hydraulic fluid power pumps and motors. It is applicable to cylindrical keyed shaft ends with an external thread, as well as to those without a thread, to conical keyed shaft ends with an external thread and to 30° involute spline shaft ends.
NOTE Involute spline is in accordance with SAE J744 [1] .