Hydraulic fittings vs hydraulic adaptors adapters vs compression fittings

Date:Nov 23, 2019

Hydraulic fittings, hydraulic adaptors, hydraulic adapters, compression fittings and tube connections is the different names,from different countries for the same function of hydraulic connectors. SO they have various standards from SAE, BS, DIN, JIS etc, but in 1994 year,  International organization of standards make various standards in ISO 8434 series standard. Exclude JIS standards of hydraulic fittings adatpers.


Here is the histroy of hydraulic tube fittings, hydraulic adaptors and connectors, compression fittings and tube connections:


Hydraulic tube fittings is from America SAE J514 Standard in 1950 year, there are 37 degree flared and flareless types of hydraulic tube fittings and O-ring plugs. Also included are pipe fittings and adapter unions for use in conjunction with these tube fittings. These fittings are intended for general application in hydraulic systems on industrial equipment and commercial products.  The related standards is SAE J1453, SAE J512, SAE J513, SAE J926, SAE J1926, SAE J516, SAE J518, SAE J1475 etc.

 1 SAE J 1453 ISO 8434_3 hydraulic tube fittings orfsSAE J514 ISO 8434-2 type hydraulic fittings

Hydraulic adatpors and connectors is from British standard BS 5200 in 1975 year, it is based upon original proposals prepared by the association of hydraulic equipment manufacturers in 1975 year. It is for connecting rigid and flexible tubing to hydraulic fluid power system components. Fourteen styles of adaptor and five styles of hose fittings, female end fitting type.The related standrards is BS 5380, BS 5327, BS 4586, BS 4518, BS 3832, BS 2779 and BS 1936.

 BS 5200 ISO 8434-6 hydraulic adaptors connectors

Compression tube fittings with cutting ring is from Germany Ermeto in 1930’s, DIN 2353 compression fittings and couplings, with stud ends with DIN 3852-1, DIN 3852-2, DIN 3852-11. It is a flareless metric fittings type to connect tube, hose assemblies.

 DIN 2353  ISO 8434-1 Hydraulic Compression fittings

End fittings and adapters for hydraulic hose assemblies from Japan JIS standards in 1984 year, it is very popular fittings in Japanese construction machinery equipment market. The related standards is JIS B2351, JIS B0202 etc.

 JIS B8363 hydraulic adapter fittings

Metallic tube connections for fluid power and general use from International organization of standards called ISO 8434 in 1994 year, it is headquartered in Geneva, Switzerland, and works in 164 countries, to promotes worldsiwdes industrial and commercial standards. The related ISO 8434 series hase -1, -2, -3, -4 and -6 santdards, covers America standards, British Standard, Japanese standards, Germany standards, Chinese standards.


Now, we often use ISO 8434 series standard of hydraulic tube connections to be interchangable to SAE J514, SAE J1453, DIN 2353, BS 5200 etc standards fittings and adapters. But there are some difference standards is not interchangeable in Japan such as JIS B8363, JIS B2351 etc, Komastu hydraulic fittings, Caterpillar hydraulic fittings etc Original equipement manufactures’s standards.


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