This SAE Standard gives the specifications and dimensions for the assembly and clearances common to hydraulically-operated cylinders and to trailing-type farm implements.

The specifications given permit the interchangeability of hydraulic operation between tractors equipped with a cylinder and trailing-type implements designed for this purpose, the tractor possessing enough power at its drawbar to operate the implement; and the transference of the hydraulic cylinder from one implement to another.

This document applies to three categories of agricultural tractors, as follows in Table 1:

This standard is the English translation of ISO 2057 dated 1981-11-15, except where indicated by a double asterisk (which indicates a change, an addition, or deletion) and the addition of SAE reference documents where applicable.