High Temperature Bearings and Bearing Units
Bearings built from heat-stabilised rings with graphite or steel cages and lubricants that survive where ordinary grease carbonises. They are used where the bearing sits inside the hot zone rather than outside it. SES holds the range as an authorised SKF distributor, covering typical range From about 150 °C up to 350 °C by execution; ring treatment Heat stabilised, S1 to S4 classes; cage options Graphite, steel or heat-resistant alternatives; clearance C3 or C4 as standard for hot duty. Executions include high temperature deep groove ball bearings, bearings with graphite cages, heat-stabilised spherical roller bearings, high temperature y-bearing units, among others. It is specified most often into kiln car and tunnel kiln trolley wheels in refractory and tile plant and furnace charging and discharge conveyors in forging shops. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Temperature
Continuous duty well above standard grease limits
Rings
Heat-stabilised to hold clearance at temperature
Cage
Graphite or steel, depending on execution
Lubrication
Solid graphite or high-temperature grease
Where it runs.
You will find High Temperature Bearings and Bearing Units in the parts of a plant where this particular duty actually occurs. In practice that means kiln car and tunnel kiln trolley wheels in refractory and tile plant, furnace charging and discharge conveyors in forging shops, continuous baking and drying oven chain guides, and equally roller hearth furnace roll ends in heat treatment, hot air recirculation fans on dryers, foundry sand reclamation and cooling conveyors. What links them is the duty rather than the machine name — temperature: Continuous duty well above standard grease limits. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Bearing runs inside the oven and cannot be relubricated on a schedule — Use the graphite cage execution that carries its own solid lubricant. A conventional bearing repacked with high-temperature grease still bakes the oil out and seizes on the second or third pass. The wheel or roll goes through a hot then cold cycle every trip — Allow for internal clearance loss at temperature and specify the greater clearance class. A CN clearance bearing at 300 °C is preloaded and the raceway spalls early. Shaft and housing are different materials, for example steel shaft in a cast housing — Calculate differential growth before fixing both rings. Locating the bearing at both ends of a hot roll axially traps the thermal growth and pushes the outer ring out of the housing. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Record the actual bearing housing temperature with a contact probe, not the process temperature from the panel. Kiln car bearings often run 100 °C cooler than the tunnel and specifying for the tunnel figure buys expensive bearings you did not need.