Applies to self-contained compressed-air breathing apparatus designed as positive-pressure breathing apparatus. Specifies a thread connection, M 45 x 3, which may optionally be used for facepieces for positive-pressure breathing apparatus.
SANS 50148-3:2003 history
2003SANS 50148-3:2003 Respiratory protective devices - Threads for facepieces Part 3: Thread connection M 45 x 3