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, hose selection  Hydraulic tube fittings 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, gasP-pressure pressure, maximum working pressure number (including system impact pressure)