Understanding the Different Types and Sizes of Pillow Block Bearings

Pillow block bearings are vital in numerous industrial and mechanical systems, serving to support the smooth rotation of shafts while handling varying load levels and motion conditions. In this blog, we will discuss all the basics of pillow block bearings and essential factors to consider for selecting the appropriate size and kind for a particular application.

As a more specialized type of mounted bearing, the pillow block is known for being able to handle both radial and axial loads alike. Their design features a robust housing which is secured onto a framework or base, thus stabilizing the bearing and ensuring it remains in position. The interaction between these components and a rotating shaft is facilitated by an inner raceway, which forms a cylindrical opening that snugly accommodates a shaft. The inner raceway contains rolling elements which reduce friction and wear as a shaft spins, an essential factor in ensuring the efficient operation of many mechanical systems.

One of the main advantages of pillow block bearings is their flexibility in accommodating different load requirements and shaft diameters, a result of varying types and sizes being available on the market. The most common types of rolling elements present in pillow block bearings include ball, tapered, and needle variations, each offering different levels of load capacity and motion control. Ball elements are ideal for applications where lower load capacities and higher speeds are required, as they provide smooth, low-friction rotation that is useful for conveyor belts and other light-duty machinery. On the other hand, tapered and needle rollers are often utilized in heavy-duty equipment that require higher load capacities and durability. An important distinction to make is that needle rollers may not be as suitable for axial forces, while tapered versions are better at handling both radial and axial loads.

Additionally, the size of the pillow block bearing itself can vary, where one should make a selection based on the diameter of the shaft it is supporting. Smaller pillow block bearings are often used in light machinery, small conveyor systems, and even automotive applications, where the loads are relatively low and space is a limiting factor. In contrast, larger options are employed for supporting equipment such as industrial presses and agricultural machinery, where demands are significantly greater.

Pillow block bearings are also versatile in terms of the materials used in their construction, with the housing and rolling elements often being constructed differently to suit specific applications. The housing material is crucial for providing structural support and durability, and cast iron is often used for its exceptional strength, impact resistance, and ability to withstand heavy loads. Meanwhile, stainless steel housings are favored in environments where corrosion resistance is critical, such as food processing plants, marine settings, and chemical industries. The bearings themselves are often made from hardened steel, which provides necessary durability for withstanding continuous motion and heavy loads. In some cases, materials like ceramic or polymer are used for applications that require enhanced resistance to heat, corrosion, or electrical conductivity. The combination of a durable housing and an appropriately selected rolling element ensures that pillow block bearings can withstand the stresses of their operating environments, extending their service life and ensuring consistent operation.

Here on NSN Fulfillment, we carry pillow block bearings and a broad range of other bearing types that are immediately available for purchase. Over 2 billion parts are featured on our platform to meet countless needs, so you can explore our website to find all that you require and seamlessly kick off procurement. While we always secure competitive prices and rapid lead times for each order, we are also happy to accommodate the unique needs and restrictions of customers to the best of our ability. Bearing this in mind, do not hesitate to get in contact with a representative to see how we can serve you.