3/4" UCP204-12 Pillow Block Bearing + Cast Housing Mounted BearingUCP204 12 Pillow Block Bearing 3 4" ID Set Screw Type Mounted Bearing with Cast Iron Housing High Center Height The UCP204 12 is a heavy duty pillow block bearing with a 3 4" inner diameter and a set screw locking collar. Designed with a high center height and mounted in a P204 cast iron housing, this unit is built for easy installation and strong shaft support in industrial and agricultural applications. Inner diameter: 3 4" inch Bearing insert: