Pillow Blocks — One-Way Clutch Bearings (CSK12 / CSK15 / CSK17 / CSK20 / CSK25 / CSK30 / CSK35 / CSK40 / 1K / 2K) Key benefits Controls rotation in one direction to prevent backdrive, slipping, or reverse rotation when a driven element must lock in place. Simple pillow block housing makes mounting quick and repeatable, reducing installation time and alignment effort. Single-row rolling elements in bearing steel provide a compact, reliable solution with predictable performance and good wear resistance. Available in a broad range of models to cover multiple shaft sizes and machine layouts, improving compatibility and replacement flexibility. What this product does for you Protects drives, gearboxes, and motors by allowing free rotation in one direction and positive engagement or locking in the other. Simplifies mechanical design where overrunning, backstopping, or indexing is required without adding complex clutch systems. Minimizes downtime with a straightforward, industry-standard pillow block mounting style. Key specifications Product type: Pillow Blocks Function/type: One Way Clutch Bearings (overrunning/backstop function) Models: CSK12 / CSK15 / CSK17 / CSK20 / CSK25 / CSK30 / CSK35 / CSK40 / 1K / 2K Rolling bearing seat material: Bearing steel Number of rolling element rows: Single row Performance and compatibility Single-row design: compact footprint for constrained spaces while maintaining dependable engagement characteristics. Bearing steel construction: provides consistent hardness and wear resistance typical for rolling element components. Model range: multiple sizes allow selection of the correct bearing and pillow block combination to match shaft diameter and load conditions; consult model number to confirm exact fit for your application. Typical applications Conveyor systems: prevent reverse movement of conveyor belts or loaded rollers when the drive stops or reverses, acting as a backstop. Packaging and processing machinery: enable indexing or one-direction transfer of parts without complex control logic, protecting mechanisms during stoppages. Winches and lifting equipment: allow controlled freewheeling in one direction while preventing unintended reverse motion under load. Installation and maintenance notes Mount in a correctly aligned pillow block housing to ensure reliable engagement and even wear of the rolling elements. Confirm model selection (CSK12 through CSK40, 1K, or 2K) matches shaft diameter and expected load conditions before installation. Follow standard bearing handling and lubrication practices appropriate for your operating environment; regular inspection will extend service life. Choose these pillow block one-way clutch bearings when you need a compact, housing-mounted solution to allow controlled one-direction rotation, protect drivetrains from reverse motion, and maintain compatibility across common machine configurations.