This standard BS 5186:1975 Specification for shaft centre heights is classified in these ICS categories:
21.120.10 Shafts
This British Standard relates to shaft centre heights of 25 mm and above for driving and driven machines. It specifies four series of shaft centre heights.
Nominal dimensions and tolerances for heights of 25 mm and above for driving and driven machines. Values selected from the R5, 10, 20 and 40 series.