Introduction In the world of fluid power and industrial hydraulics, standards are the silent guardians of safety, interoperability, and performance. One such historical yet influential standard is DIN 764 , a German standard that defined the requirements for light metal screw couplings (typically made of aluminum or anodized aluminum) used with rubber hoses.

While many original DIN 764 documents have been superseded by broader European (EN) or international (ISO) standards, understanding DIN 764 remains crucial for maintaining legacy equipment, repairing older machinery, and appreciating the evolution of hydraulic connection technology. DIN 764: Light metal screw couplings for rubber hoses specified the design, dimensions, materials, and testing requirements for lightweight, corrosion-resistant couplings intended for use with textile or wire-braid reinforced rubber hoses.