This standard fixes the dimensions of coupling nipples which in mining are used to connect up hoses as per DIN 20018 part 1 to part 3 and DIN 20022 part 2 being armed with hose fittings as per DIN 20033 and DIN 20026.
DIN 20036:1990 history
1990DIN 20036:1990-10 Hose fittings; coupling nipples with round thread form
1990DIN 20036:1990 Hose fittings; coupling nipples with round thread form