This part of ISO 13486 specifies the essential dimensional and physical characteristics for double flares of metallic pipes (with and without surface protection), tapped holes, male fittings, and driving fit seats used in hydraulic braking systems for road vehicles.
BS ISO 13486-1:1999 history
1999BS ISO 13486-1:1999 Road vehicles - Hydraulic braking systems - Double-flare pipes, tapped holes, male fittings and tube seats