DIN fittings are produced in accordance with DIN2353-ISO8434-1 rules.
Assure a perfect holding to  the coupling with steel  and hose tubes for pressures from 10 to 20 Mpa (L series) and pressures from 25 to 63 Mpa (S series) for temperatures from -40°C to +120°C. Obtained from stamped steel or from drawn bars.