The documents specifies requirements for pipe nuts with thread in accordance with DIN ISO 228-1 with nominal sizes G 1/8 to G 6 for product grade B and C.
DIN 431:2000 history
2013DIN 431:2013-05 Pipe nuts with thread according to DIN EN ISO 228-1
2013DIN 431:2013 Pipe nuts with thread according to DIN EN ISO 228-1
2000DIN 431:2000 Pipe nuts with thread according to DIN ISO 228-1
1970DIN 431:1982 Pipe nuts with thread according to DIN EN ISO 228-1
1970DIN 431:1972 Pipe nuts with thread according to DIN EN ISO 228-1