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Introduction A pillow block bearing — also called a plumber block or mounted bearing — is a self-contained bearing unit that bolts directly to a machine frame or foundation. The bearing is pre-assembled inside a cast iron or pressed steel housing, ready to support a rotating shaft. While pillow blocks are designed for simplicity, incorrect […]

Introduction Needle roller bearings pack high load capacity into a remarkably compact radial cross-section. Their defining feature — rollers that are at least 3x longer than their diameter — enables them to handle heavy radial loads where space is tight. But that compactness comes with specific installation and lubrication requirements that, if ignored, lead to

Introduction Internal clearance is one of the most misunderstood yet critical parameters in bearing selection. Choose the wrong clearance class, and your bearing will either overheat from excessive preload or vibrate from excessive slop. This guide explains what radial internal clearance (RIC) means, what each clearance class (C2 through C5) is designed for, and how

Introduction The deep groove ball bearing is the most widely used rolling bearing in the world — from electric motors to bicycle hubs, from washing machines to industrial gearboxes. But within the category, there are distinct types differentiated by sealing and shielding configuration. Choosing the right type is crucial: an open bearing in a dusty

Introduction For applications where quiet operation is critical — electric motors for HVAC, office equipment, medical devices, and household appliances — bearing noise is a key selection parameter. But “quiet” isn’t a specification — you need to specify the right noise grade and vibration class according to recognized standards. This guide explains the ABEC, JIS,