Bearings are insert bearings with an extended inner ring.  They are specifically designed for mounting on shafts without using adapters, lock-nuts, or shoulders. They are popular in many applications due to their versatility, and cost effectiveness.  The bearing is typically locked in place using setscrews (or a locking eccentric collar). The inner ring usually extends on both sides of the bearing to provide extra shaft support.
ER Series insert bearings are typically used in applications in the following industries:Agricultural,Conveyor / conveyance,Construction
Food and beverage processing,Packaging,Textile
ER Series Insert Bearings are available in both metric and inch bore dimensions (Note: Both metric and inch bore series have "metric" outer diameters).  They accommodate standard shaft sizes from 12 mm to 60 mm and 1/2” to 1-7/8” respectively.