Pillow block bearings are among the most widely used mounted bearing assemblies in British industry. Whether you are maintaining a conveyor in a distribution center, replacing worn components in a food processing plant, or sourcing bearings for a new production line, understanding what to look for before you buy is essential. This guide walks maintenance engineers, plant managers, and procurement specialists through everything they need to know — from housing materials and load ratings to UK supplier selection and long-term maintenance planning. What Are Pillow Block Bearings? Pillow Block bearings are housed bearings constructed from a bearing insert and a bearing housing which are combined into one, ready-to-install unit. The housing is flat, resting on a surface and bolted to it; it supports a rotating shaft which goes through the bearing insert. This design is easy to install, does not require extensive alignment, and allows for easier maintenance than separate bearing and housing. The bearing insert in the housing is usually a self-aligning bearing, most often of a spherical outer ring type, which permits the unit to accommodate slight misalignment of the shaft as a result of thermal expansion, structural deflection or incorrect installation. Buyers of pillow block bearings UK do so for one of the principle reasons that these bearings are self-aligning. How Do Pillow Block Bearings Work? The insert bearing is a part of the housing that rotates along with the shaft. The housing is secured to a machine frame, conveyor structure or equipment base. When the shaft is spinning, the radial and moderate axial loads as a result of the application are transferred by the bearing insert to the supporting structure through the housing. They are lubricated (usually greased) via a grease nipple on the housing. Sealed on each end to hold lubricant and keep contaminants away from the bearing. The sealing quality can also vary between bearing grades, especially for industrial pillow blocks for washdown, outdoor or contaminated applications. Mounting is done in the form of eccentric locking collar and set screw locking arrangement. Both designs are used in industry in the United Kingdom but eccentric collar designs tend to have better shaft retention in cases of shock loads and reverse rotation. Pillow Block Bearing vs Flange Bearing: What's the Difference? This is one of the most frequently asked questions when looking at sourcing housed bearing units UK applications call for. The difference is in the way the mounts are positioned: Pillow block bearings are installed on a horizontal surface (floor, frame, base plate) with its shaft axis parallel to the surface. They are the conventional bearing for conveyor systems, line shafting and drive arrangements where the bearing is located below the shaft. Flange bearings fasten to a vertical surface like a wall, panel or machine frame end plate. They are needed when the shaft is located within the mounting surface instead of on top. These both feature comparable insert bearing technology and are offered in the identical housing materials. This is based on machine geometry and not load or performance. Housing Materials: Cast Iron vs Stainless Steel The type of material used for the housing is a critical factor in purchasing pillow block bearings in the UK. Cast iron and stainless steel are the two most common materials, each with its own set of advantages and disadvantages. Cast Iron Pillow Block Bearings Most commonly, cast iron pillow block bearings are used in most of the general industrial applications. The cast iron housing provides: Excellent anti-bending performance at high strength and rigidity under heavy radial loads and shock loads. Achievement of high end to end stability. High end to end stability. Fitment on standard grease lubricants Selected Bearing Distributors from the UK will be available. Affordable pricing over a wide size range Cast iron bearing housing units are the most requested in manufacturing, mining, aggregate handling, material handling and general engineering applications. Brands of this kind include SKF(SY Series), Timken, NSK, FAG, NTN and FYH with lots of cast iron ranges throughout the United Kingdom. Stainless Steel Pillow Block Bearings With applications where there is no compromise on corrosion resistance and hygiene compliance, stainless steel pillow block bearings UK are in steady demand. The following are stainless steel housings: Restaurants, cafés, and other food and beverage preparation businesses that need to wash down their work areas. Pharmaceutical and chemical manufacturing environments Any installations outdoors that are subject to weather and moisture Marine and coastal environments with high levels of salt air that cause corrosion to speed up Where cast iron corrosion could be a problem in a product or process Self-aligning bearings UK installations are also FDA approved with grease choices and hygienic sealing options, making…