1. Product Overview 628/8R is a non-standard single row deep groove ball bearing. Standard 628 bearing bore size is 6mm, while 628/8R adopts modified inner ring with 8mm bore diameter, outer diameter 24mm, width 8mm. Open structure supports periodic lubrication maintenance. It can bear radial load and light bidirectional axial load simultaneously. Optional versions: 628/8ZZ with metal shields, 628/8-2RS with rubber seals. Widely used in miniature motors, handheld power tools,