How to Choose the Right Industrial Bearing for Your Application
A practical framework for matching bearing type, load rating and seal grade to your operating conditions.
Most bearing problems start at selection, not at installation. A bearing that is the right size but the wrong type, clearance or seal will wear out early, however well it is fitted. This guide sets out the questions to answer before you order.
1. Start with the load: radial, axial or both
Radial load acts at right angles to the shaft; axial (thrust) load acts along it. Deep groove ball bearings handle moderate radial load and some axial load in both directions. Cylindrical roller bearings carry heavy radial load but little or no axial load. Tapered roller bearings carry both together, and spherical roller bearings add tolerance for shaft misalignment.
Write down the size and direction of the loads, including shock loads at start-up or from the process. If the load is heavy or uncertain, a roller bearing is usually the safer starting point than a ball bearing of the same size.
2. Check speed and temperature
Ball bearings generally allow higher speeds than roller bearings of the same bore. Every bearing has a speed limit given in its catalogue, and that limit drops with a contact seal, with grease instead of oil, and with higher operating temperature.
Standard bearings are made for a stated temperature range. If the bearing runs hot, for example near a kiln, dryer or hot gearbox, ask for a heat-stabilised version and a grease rated for the temperature.
3. Decide on clearance, seals and cage
Internal clearance is the small play inside the bearing. The common alternative to normal clearance is C3, which has more play and is used where the inner ring runs hotter than the outer ring, or with a tight interference fit. Electric motors and fans often use C3.
Seals matter in dusty or wet plants. A bearing with the suffix 2RS has a rubber seal on both sides, and ZZ has a metal shield on both sides. Shields keep out coarse dirt with lower friction; rubber seals keep out finer dust and moisture.
4. Match the size to the shaft and housing
Measure the shaft diameter, the housing bore and the space available for the width. These three dimensions set the bore, outside diameter and width of the bearing. Our catalogue pages list these for each size, so you can confirm a match against the part number you already have.
5. Consider the brand and the supply route
A bearing from a recognised manufacturer comes with a traceable part number and published ratings. Whichever brand you choose, buy from a supplier who can show you the part number on the box and the batch on the invoice.
Key Takeaways
- Define the load direction and size first, then pick the type.
- Check speed and temperature against the catalogue limit.
- Choose clearance and seals for the actual operating conditions.
- Confirm bore, outside diameter and width before you order.
- If in doubt, send us the old bearing number and the application.
This article is general guidance. For a recommendation for your own application, contact our engineering team. Browse industrial bearings →