This international standard lays down preferred boundary dimensions for radial bearings.
Tapered roller bearings, insert bearings and some types of needle roller bearings, airframe bearings and instrument precision bearings standardized by ISO do not conform to this general plan because the dimensions given were not found to be optimal for the bearings in question.
ISO 15:1998 history
2017ISO 15:2017 Rolling bearings - Radial bearings - Boundary dimensions, general plan
2011ISO 15:2011 Rolling bearings - Radial bearings - Boundary dimensions, general plan
1998ISO 15:1998 Rolling bearings - Radial bearings - Boundary dimensions, general plan
1985ISO 15:1981/Add 1:1985 Rolling bearings — Radial bearings — Boundary dimensions — General plan — Addendum 1: Diameter series 7 (d greater than or equal to 12 mm and less than or equal to 30 mm)
1981ISO 15:1981 Rolling bearings; Radial bearings; Boundary dimensions; General plan