According to this standard locking screws can be used following DIN ISO 228 part 1 (for instance air containers).
DIN 5586:1989 history
2023DIN 5586:2023-12 Compressed air equipment for rail vehicles - Locking screws with collar and vent
2023DIN 5586:2023-06 Compressed air equipment for rail vehicles - Locking screws with collar and vent / Note: Date of issue 2023-05-12*Intended as replacement for DIN 5586 (1989-02).
1989DIN 5586:1989-02 Compressed air equipment for rail vehicles; locking screws with collar and vent
1989DIN 5586:1989 Compressed air equipment for rail vehicles; locking screws with collar and vent