What is the industry standard for hydraulic hose

There are many standards such as GB ISO SAE DIN JISGB is a reference to the ISO standard , most companies are running GB ( nominal diameter 5mm-51mm)
You just know that your condition is what it looks like , according to the working conditions can be selected hose , Hydraulic pipe fittings  hose selection STAMP principles:S-SIZE dimensions , namely pipe inner diameter , outer diameter , lengthT-Temperature temperature, medium temperature, ambient temperatureA-Application Application for what purposes ,M-Media medium , what medium conveying solid, liquid, gas
P-pressure pressure , maximum working pressure number ( including system impact pressure )