June 2026

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 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 Ceramic hybrid bearings — with steel rings and ceramic rolling elements — bridge the gap between standard all-steel bearings and exotic full-ceramic bearings. They offer higher speed capability, better electrical insulation, and longer life in marginal lubrication conditions. But not all ceramics are equal: silicon nitride (Si3N4) dominates the market, while zirconia (ZrO2) fills

Introduction Under-lubricated bearings run dry and fail. Over-lubricated bearings overheat, blow seals, and contaminate the product. Getting the interval and quantity right is the single highest-impact maintenance practice for extending bearing service life. This guide provides the formulas, tables, and rules of thumb that maintenance teams and reliability engineers use to build lubrication schedules that

Introduction Under-lubricated bearings run dry and fail. Over-lubricated bearings overheat, blow seals, and contaminate the product. Getting the interval and quantity right is the single highest-impact maintenance practice for extending bearing service life. This guide provides the formulas, tables, and rules of thumb that maintenance teams and reliability engineers use to build lubrication schedules that

Bearing clearance classes: C2 (tighter than CN), CN (standard), C3, C4 (largest clearance) with typical micrometer gap ranges Bearing clearance classes: C2 (tighter than CN), CN (standard), C3, C4 (largest clearance) with typical micrometer gap ranges Quick Selection Chart

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