DIN 2353 tube fittings are used in a wide variety of fluid power applications, especially in factory, oil & gas, and construction equipment. Metric sizes from 4 to 42mm made of carbon steel or stainless steel are most prevalent. DIN (Deutsches Institut für Normung, translated as the German Institute for Standardization) metric and BSPP (British Standard Parallel Pipe) are the most common thread styles in Europe. DIN type tube fittings conform to the requirements of ISO 8434-1, DIN 2353, and DIN EN 3850 standards. This ensures interchangeability among leading brands of fittings.
DIN2353 metric fittings are available in three series of tube port end connections: tube-to-tube, tube-to-female port, and tube-to-male thread. They are also offered in three different pressure series—LL for Extra Light and intended for low-pressure applications, L for Light and used medium-pressure applications, and S for Heavy, used high-pressure applications. They are identified by measuring the thread size, pitch and the tube’s outside diameter (OD).
As with other compression-style fittings, DIN 2353 fittings consist of a body, cutting ring (ferrule) and nut. DIN connections are used in:
- tube fittings
- alternating valves
- banjo and swivel couplings, and
- check and non-return valves.
A wide variety different configurations and threaded connections enable DIN 2353 fittings to meet many connection challenges. These flareless metric fittings are the most widely used bite-type fittings in the world. As with other compression-style fittings, DIN fittings consist of a body, cutting ring (ferrule) and nut. No O-rings or other elastomeric components are needed to provide a seal. Instead, two cutting edges of a ring (ferrule) bite into the outer surface of the tube, ensuring the necessary holding power and seal for high operating pressures and extreme vibration.
Materials of Construction
As with any fluid power component, DIN 2353 fittings should be made of high-quality materials. Stainless steel 1.4571 (316 Ti) is the gold standard, providing exceptional high-temperature and corrosion resistance. Stainless steel 316 Ti is used in environments with high levels of salt, acids, or near weld seams. Carbon-steel fittings may cost less initially, but the long service life of stainless steel provides a significant reduction in total cost of ownership, leading to fewer parts replacement and lower maintenance costs.
DIN 2353 fittings made of 1.4571 stainless steel fittings withstand harsh environments with the presence of:
- acids,
- dirt,
- high heat,
- shock and impacts,
- salts,
- vibrations, and
- other corrosive substances in the air
