International Differences and Hydraulic Fittings Standards

When choosing quick couplings, it is essential to evaluate the elements and sealing systems for the most suitable fitting. Hydraulic adapters and fittings consists of two elements:

●       A threaded element which connects the coupler to the pipe

●       A sealing element to ensure there are no leaks

The sealing system can employ different technologies such as the type of seal, a threaded cone with hydraulic tape or an interlocking seal between two parts with specific geometries.

Country Classifications of Hydraulic Fittings

The rules and classifications that define hydraulic fittings vary from country to country. The most common types of quick connect fittings are common standards in the United States which take into account the type of sealing technology such as:

●       NPT, National Pipe Taper

●       ORFS, or Ring Face Seal

ISO standards prevail in the European union for a more general framework with Germany and Great Britain also having specific regulations. The German standard is Deutsches Institut für Normung, DIN, while in Great Britain the most common types of fittings are:

BSP, British Standard Pipe, which includes:

●       BSPP: with a threaded section of a constant size

●       BSPT: with a threaded section of a variable size

in addition to the international differences in hydraulic fittings standards, different classifications can provide information regarding the application used. In the automotive industry, the U.S. Society of Automotive Engineers, SAE, use types of couplings according to the type of application in the automotive sector.

It is of critical importance to understand the referenced standard to determine the compatibility between threaded quick couplers and connection with the pipe. It is also necessary to determine that the type of threading and diameter are compatible.  This will prevent problems with pressure drop, leaks and potential risks to operators.

Stucchi offers a wide selection of hydraulic fittings and adapters in various port options and sizes to meet industrial demands worldwide.  We offer more than 60 years of experience in provide customized, hydraulic solutions which improve operational efficiencies and safety improvements.  Contact us with any questions on the right quick coupling for your application and industry standards.