This standard BS EN ISO 8826-1:1995 Technical drawings. Roller bearings is classified in these ICS categories:
01.100.20 Mechanical engineering drawings
21.100.20 Rolling bearings
This part of ISO 8826 specifies the general simplified representation for rolling bearings.
This representation should be used when it is not necessary to show the exact shape and details of the rolling bearing, for example in assembly drawings.